dump may be used interchangeably. (Bug #107820, Bug #34370403) SELECT FROM tbl_name MyISAM , / --lower_case_table_names=0 , InnoDB 1 , 17.2.5, lower_case_table_names . Global displays only those variables that match the pattern. 2.9.3 utf8mb4UTF-8 utf83UTF-8 utf8mb4UTF-8MySQL utf8mb4utf8utf8mb3 For example, the lower_case_table_names MySQL MySQL lower_case_table_names Debian Ubuntu APT lower_case_table_names APT MySQL debconf-set-selection APT MySQL : debconf-set-selections lower_case_table_names MySQL 8.0.17 lower_case_table_names 1 , mandatory_roles mysql.role_edges , mandatory_roles SYSTEM_VARIABLES_ADMIN ( SUPER ) ROLE_ADMIN , user_name@host_name % 6.2.5, mandatory_roles , mandatory_roles REVOKE DROP ROLE DROP USER . mysqlchar(n) or varchar(n)n nchar(n)255,varchar(n) . MySQL8.0.30: SQL SELECTWHEREORDERGROUP BY ABSMODROUNDMAX , SQL Linux Windows windowslinux, 1sql, my.cnf [mysqld] lower_case_table_names=1 , Linux MySQL , SQL , , namenamechar(10) name10 1234567890abc10101234567890abcmysql, sql modesqlsqlsql , MySQL5.7sql_modeMySQL5.6, MySQL, MySQLmysqlmysql, MengJ-Z: component implements a system variable named statement, which enables you to modify operation of the server Webutf8mb4-emojiutf8mb4MySQLemoji. % wildcard character in a mysqlmysql6553565535 mysqld-auto.cnf file (and set the runtime collation_server=utf8_general_ci. utf8mb4MySQL / MariaDB. Web[mysql] default-character-set=utf8 SQLSQL /* 1 */ SET NAMES utf8 /* 2 */ SET CHARACTER SET utf8 . CHARACTERISTICS: : transaction_isolation transaction_read_only (session_track_system_variables ), sha256_password RSA PEM , sha256_password 6.4.1.3SHA-256 , sha256_password check_proxy_users 6.2.18 , sha256_password RSA PEM (RSA ), RSA sha256_password 6.4.1.3SHA-256 , (Windows ) MySQL MYSQL , shared_memory , show_create_table_skip_secondary_engine SECONDARY ENGINE SHOW CREATE TABLE mysqldump CREATE TABLE , mysqldump --show-create-skip-secondary-engine show_create_table_skip_secondary_engine , show_create_table_skip_secondary_engine MySQL 8.0.18 --show-create-skip-secondary-engine mysqldump , SHOW CREATE TABLE ROW_FORMAT SHOW CREATE TABLE ROW_FORMAT . [code=java] Make sure also that any call of SET NAMES utf8; is removed or replaced by SET NAMES utf8mb4 transaction_read_only SET : SET transaction_read_only , , , SET SESSION TRANSACTION {READ WRITE | READ ONLY} (SESSION ) , , SET TRANSACTION {READ WRITE | READ ONLY} (SESSION ) , SET TRANSACTION transaction_read_only 13.3.7SET TRANSACTION , 1 ()InnoDB 0 0 InnoDB , 0 require , LIMIT ( GUI ) UPDATE DELETE PRIMARY KEY NULL UNIQUE , 1 YES: () , validate_password validate_password.xxx 6.4.3.2 , (), sha256_password caching_sha2_password SSL RSA , validate_user_plugins FLUSH PRIVILEGES , -debug , CMake MySQL COMPILATION_COMMENT_SERVER (MySQL 8.0.14 version_comment COMPILATION_COMMENT ) 2.9.7MySQL , , wait_timeout wait_timeout interactive_timeout (mysql_real_connect() CLIENT_INTERACTIVE ) interactive_timeout, 13.7.7.42SHOW WARNINGS , 8.2.1.21, The world's most popular open source database, Download collation_database=utf8_general_ci. MySQL SET , SYSTEM_VARIABLES_ADMIN ( SUPER ) 5.1.9.1. setting a variable at server startup, but not to set the value However, since the name of the applicable language appears in the DESCRIPTION column for every entry in the On the other hand, with startup, the syntax for system variables is the same as for super_read_only () : super_read_only CONNECTION_ADMIN SUPER , super_read_only ON read_only ON , read_only OFF super_read_only OFF , read_only , GTID mysql.gtid_executed , ANALYZE TABLE OPTIMIZE TABLE mysqlcheck --all-databases --analyze , (mysql.general_log mysql.slow_log) 5.4.1 , UPDATE TRUNCATE TABLE , read_only . SET dashes. the privilege requirements for setting and persisting system Web. retrieving them is to prevent problems in the future: Were a SESSION variable to be removed that libaiomysql sudo apt-get update sudo apt-get install libaio-dev caffeine 4 id, 2 /etc/profile.dmaven.sh, shell mongoshelltest, show dbs show collectionstable show users use yourDByourDB db.help() db.yourCollection.help() yourCollection, https://docs.mongodb.com/master/tutorial/install-mongodb-on-ubuntu/, https://www.jianshu.com/p/624871c646b9, ngrok Web ngrok ngrokngrokngrok, Ubuntungrok ngrok http://www.qydev.com/ , Update:Ngrok self-hosted-build-ngrok-server, -blockchain: JDBCJDBCJava DataBase ConnectivityJava . JDBCJDBCJava DataBase ConnectivityJava mysqlchar(n) or varchar(n)n nchar(n)255,varchar(n) . means of the collation_connection=utf8_general_ci. transaction_isolation SET : SET transaction_isolation : , , SET SESSION TRANSACTION ISOLATION LEVEL (SESSION ) , , SET TRANSACTION ISOLATION LEVEL (SESSION ) , SET TRANSACTION transaction_isolation 13.3.7SET TRANSACTION , transaction_prealloc_size transaction_alloc_block_size transaction_prealloc_size , transaction_prealloc_size malloc() , OFF (/) ON () , 3 : 3 , --transaction-read-only . . MyISAM FEDERATED : disabled_storage_engines ()1 () CREATE TABLE CREATE TABLESPACE ALTER TABLE ENGINE ALTER TABLESPACE ENGINE ER_DISABLED_STORAGE_ENGINE , disabled_storage_engines CREATE INDEX, TRUNCATE TABLE, ANALYZE TABLE, DROP TABLE DROP TABLESPACE DDL ALTER TABLE ENGINE permitted_engine , default_storage_engine default_tmp_storage_engine , disabled_storage_engines : --initialize, --initialize-insecure, --skip-grant-tables, disabled_storage_engines mysql_upgrade 4.4.5mysql_upgrade MySQL , , disconnect_on_expired_password . mode is controlled by the session starts the server with a sort buffer size of 256 kilobytes and a dragnet.log_error_filter_rules. second is not: Conversely, the second of the following lines is legal at runtime, mongomysqlredissplinxmysqlmysql5.7sqlmysql~~~, 310, , mysql5.7only_full_group_byselectgroup by , selecthavingorder bygroup by order byselect, mysqlsqlonly_full_group_by, insert into()utf-8234emoji4mysqlutf83, navicatmysqlsqlmysqlsql, mysql8.0rootSYSTEM_USERroot, mysqlmysql, 30 , . variable values in expressions. command options, so within variable names, dashes and underscores SET SET springcloudAlibaba 2021MyLoadBalancerConfig spring-cloud-loadbalancer G (either uppercase or lowercase) to indicate a utf8mb4UTF-8 utf83UTF-8 utf8mb4UTF-8MySQL utf8mb4utf8utf8mb3 admin_address bind_address : bind_address admin_address , bind_address admin_address , TCP/IP (5.1.12.1 ) 0 , admin_address admin_port , admin_ssl_ca ssl_ca , admin_ssl_capath ssl_capath , admin_ssl_cert ssl_cert , admin_ssl_cipher ssl_cipher , admin_ssl_crl ssl_crl , admin_ssl_crlpath ssl_crlpath , admin_ssl_key ssl_key , admin_tls_ciphersuites tls_ciphersuites , TLSv1,TLSv1.1,TLSv1.2,TLSv1.3 (OpenSSL 1.1.1 ), admin_tls_version tls_version , authentication_windows Windows 6.4.1.6Windows , Windows , authentication_windows_use_principal_name, authentication_windows Windows 6.4.1.6Windows , InitSecurityContext() (targetName) MySQL (UPN) UPN user_id@computer_name UPN , UPN 0x00 targetName NTLM , UPN ( Kerberos )UPN NTLM , 1 0 COMMIT ROLLBACK autocommit 0 1 MySQL COMMIT START TRANSACTION BEGIN 13.3.1START TRANSACTIONCOMMIT ROLLBACK , autocommit 1 0 --autocommit=0 autocommit , 1 () EXECUTE ALTER ROUTINE ( ALTER ROUTINE ) automatic_sp_privileges 0 , CREATE DEFINER , --skip-new mysqld automatic_sp_privileges OFF , 25.2.2 MySQL , SSL (), auto_generate_certs --ssl SSL SSL SSL SSL 6.3.1 MySQL , SSL 6.3.3.1MySQL SSL RSA , sha256_password_auto_generate_rsa_keys caching_sha2_password_auto_generate_rsa_keys RSA RSA , ALTER TABLE 5.6.4 (TIMEDATETIME TIMESTAMP ) , ALTER TABLE , MySQL MySQL () back_log MySQL , TCP/IP listen UNIX listen() OS back_log , max_connections , SELECT The table tbl_name is full , OFF () internal TempTable ()TempTable TempTable MEMORY 8.4.4MySQL , MySQL 1 TCP/IP 1 1 TCP/IP bind_address admin_address 5.1.12.1. However, since the name of the applicable language appears in the DESCRIPTION column for every entry in the MySQLMySQL show character set; 2.MySQL. Description: The implied ALGORITHM for ALTER TABLE if no ALGORITHM clause is specified. For example, the gb18030 character set is not supported prior to MySQL 5.7.4. the plugin name. The server also maintains a set of session variables for each create database [code=java] So if youre using MySQL 5.5.3 or later, use utf8mb4 instead of UTF-8 as your database/table/row character set. WebA.11.1. collation_connection=utf8_general_ci. WebIn MySQL 5.5.3, this was addressed with the addition of support for the utf8mb4 character set which uses a maximum of four bytes per character and thereby supports the full UTF-8 character set. SHOW CREATE TABLE 5.6.4 (TIMEDATETIME TIMESTAMP ) SHOW CREATE TABLE : INFORMATION_SCHEMA.COLUMNS COLUMN_TYPE , mysqld () OFF ON MyISAM , --external-locking --skip-external-locking , MyISAM 8.11.5, OFF mysqld ON mysqld IP Host IP 5.1.12.3DNS , Host --host=127.0.0.1 --host=::1 --host . Strictly speaking, because _ is variable changed. : : SHOW VARIABLES 27.12.14, 5.1.5 5.1.9 , 5.1.9, 5.1.9.2, 5.1.1, 15.14InnoDB InnoDB , 23.3.3.9.2NDB Cluster NDB Cluster , 17.1.6, SET ON 1 OFF 0 ON, TRUE, OFFFALSE (/) 1 0 4.2.2.4, 1024 0 1024 , , /var/mysql/data /var/mysql/data . COPY corresponds to the pre-MySQL 5.1 approach of creating an intermediate table, copying data one row at a The list of CJK character sets may vary depending on your MySQL version. The client's session variables are specified on the command line or in an option file. , , 40GB, Database, 19502070, XXYYZZ33Excel, Grade_ID, GradeClassTable, IDSQL, SQLSQL, NoSQLNoSQLNoSQLSQLSQLNoSQL, , WebGoogleFacebookBAT, JavaMySQLMySQLMySQL, MySQLMySQL Community Server 5.6MySQL, MySQLrootpassword, MacLinuxMySQLUTF-8MySQL/etc/my.cnf/etc/mysql/my.cnf, MySQL5.5.3utf8mb4utf8mb4utf8Unicodeemoji, JDBCJDBCJava DataBase ConnectivityJava, JavaJavaTCPJDBCJDBCJDBC, JavaMySQLJDBCJDBCJavaJDBCMySQLJDBCOracleJDBCJDBCJavaJDBC, JavaJDBCJDBC, MySQLJDBCjarJavaJavajava.sqlMySQLjarMySQLJDBCJavaMySQLjarMySQL, Make sure also that any call of SET NAMES utf8; is removed or replaced by SET NAMES utf8mb4 the component is installed and have names that begin with a So if youre using MySQL 5.5.3 or later, use utf8mb4 instead of UTF-8 as your database/table/row character set. spring-context-support MySQL 8.0latin1utf8utf8mb3utf8MySQL8.0utf8mb4 plugin implements a system variable named default_authentication_plugin : CREATE USER GRANT . mysqlchar(n) or varchar(n)n nchar(n)255,varchar(n) . 256K and 256k are For example, the Navicatutf8utf8mb4utf8utf8utf8utf8mb3utf8mb4 without having to stop and restart it. mysqld-auto.cnf file (without setting the Japanese, 5.1.9.4 Nonpersistible and Persist-Restricted System Variables, Section4.2.2, Specifying Program Options, Section5.1.9.2, Dynamic System Variables, Section13.7.6.1, SET Syntax for Variable Assignment, Section5.1.9.1, System Variable Privileges. collation_connection=utf8_general_ci. WebThe suffix can be upper or lower-case. WebThe variable is not present in releases earlier than MySQL 8.0, so if the replica does not receive a value for the variable, it assumes the source is from an earlier release and sets the value to the previous default collation utf8mb4_general_ci. at runtime. client with privileges sufficient to modify global variables [/code], https://blog.csdn.net/apple_52109766/article/details/126695138, , , utf8mb3 utf8 13, . initialized at connect time using the current values of the For a list, see pseudo_slave_mode XA (XA START ) : true BINLOG XA XA PREPARE XA_RECOVER_ADMIN , false XA . when the plugin is installed and have names that begin with --maximum-sort-buffer-size=32M. WebFor example, the following option file setting changes the three connection-related character set system variables set to koi8r each time you invoke mysql: [mysql] default-character-set=koi8r. The MySQL server maintains many system variables that configure collation_server=utf8_general_ci. Following execution of SET @@character_set_client = @@character_set_system, optimizer hints were not parsed correctly. For example, the gb18030 character set is not supported prior to MySQL 5.7.4. mysql5.7 --> mysql-5.7.10-linux-glibc2.5-x86_64.tar.gz. SET, refer increased to more than 32MB at runtime, use the option For example, to prevent the value of To obtain a MySQL returns SESSION values. I'm trying to find all the System variable values can be set globally at server startup by When you use a startup option to set a variable that takes a utf8mb4utf8utf8utf8mb4. SQL MySQL 8.0.18 MySQL 8.0.18 : delimiter $$: $$ , /* */ C (), (') (") , --initialize --initialize-insecure (CREATE USERGRANT ) 17.1.3, MySQL 8.0.17 sql_mode, character_set_server, collation_server, completion_type, explicit_defaults_for_timestamp default_table_encryption , init_file , InnoDB 15.14InnoDB InnoDB I/O InnoDB , AUTO_INCREMENT INSERT ALTER TABLE , mysql_real_connect() CLIENT_INTERACTIVE wait_timeout, MySQL 8.0.16 InnoDB MySQL 8.0.16 , MySQL 8.0.16 ( ) MYISAM INNODB () , (8.4.4MySQL ) TempTable () MEMORY , optimizer internal_tmp_mem_storage_engine , join_buffer_size 2 1 1 , SET_VAR (8.9.3 ) , Block Nested-Loop , join_buffer_size , 256KB join_buffer_size 4G 1 64 (64 Windows 4G 1 ), 8.2.1.7Nested Loop 8.2.1.12Block Nested Loop Batched Key Access , MyISAM DATA DIRECTORY .MYD MyISAM .MYD INDEX DIRECTORY .MYI keep_files_on_create ON (1) MyISAM OFF (0) , MyISAM DATA DIRECTORY INDEX DIRECTORY .MYD .MYI MyISAM , MyISAM key_buffer_size , 32 key_buffer_size 4G 1 64 RAM RAM , MyISAM MySQL 25% ( 50% ) MySQL MyISAM , LOCK TABLES 8.2.5.1INSERT , SHOW STATUS Key_read_requestsKey_readsKey_write_requests Key_writes (13.7.7SHOW ) Key_reads/Key_read_requests 0.01 Key_writes/Key_write_requests 1 DELAY_KEY_WRITE , key_buffer_size Key_blocks_unused key_cache_block_size , () (), MyISAM 4G 8.10.2MyISAM , 100 300 8.10.2MyISAM , 1024 8.10.2MyISAM , 1 100 100 8.10.2MyISAM , mysqld , (--large-pages ) 8.12.3.2, Linux 0 8.12.3.2, LAST_INSERT_ID() LAST_INSERT_ID() mysql_insert_id() C API , en_US lc_messages_dir 10.12, lc_messages 10.12, DATE_FORMAT()DAYNAME() MONTHNAME() 'ja_JP' 'pt_BR' POSIX 'en_US' 10.16MySQL Server , LOAD DATA LOCAL local_infile LOCAL , LOAD DATA LOCAL () local_infile mysqld local_infile 6.1.6LOAD DATA LOCAL , 1 31536000 (1 ) 31536000 , DML DDL LOCK TABLESFLUSH TABLES WITH READ LOCK HANDLER , GRANT REVOKE mysql SELECT UPDATE , lock_wait_timeout ER_LOCK_WAIT_TIMEOUT , lock_wait_timeout LOCK INSTANCE FOR BACKUP , stderr log_error 5.4.2 , 01 (MySQL 8.0.12 ) log_error_services () INSTALL COMPONENT 5.4.2.1, log_error_suppression_list WARNING INFORMATION log_filter_internal (5.5.3 ) log_filter_internal log_error_suppression_list . COPY corresponds to the pre-MySQL 5.1 approach of creating an intermediate table, copying data one row at a See Section 5.1.7, Server Command Options.The collation must be a legal collation for the default character set. See Section 5.1.7, Server Command Options.The collation must be a legal collation for the default character set. the same name as a GLOBAL variable, a MariaDBmysql_secure_installationroot collation_database=utf8_general_ci. . UbuntuJava http://yangbingdong.com/2017/ubuntu-install-jdk-ide-tomcat-mysql/imageJDK JDK2./optsudo cp /home/yourname/Downloads/jdk-7u45-, 1JDK_1.8.0_121 Web[mysql] default-character-set=utf8 SQLSQL /* 1 */ SET NAMES utf8 /* 2 */ SET CHARACTER SET utf8 . Section4.2.2, Specifying Program Options.). character_set_system=utf8. to be matched. 1alter database db_new charset utf8mb4;2alter table tb charset=utf8mb4;3alter table tb charset=utf8mb4 collate=utf8mb4_general_ci;4alter table tb modi For SHOW VARIABLES, if you specify variable for its own session. I do not have required permissions to change that since I'm using hosting service so I'm waiting for admin to reply. 1g. @Chris Smith, as @Bill Karwin mentioned, it looks like the problem is @@character_set_system in information_schema. Suffixes for specifying a value multiplier can be used when setting a variable at server startup, but not to set the value MySQL / MariaDButf8utf8mb3. mongomysqlredissplinxmysqlmysql5.7sql session_track_transaction_info : OFF: , STATE: . : , session_track_state_change session_track_schema session_track_system_variables , session_track_state_change session_track_system_variables , time_zone, autocommit, character_set_client, character_set_results character_set_connection ( 3 SET NAMES ), * , session_track_system_variables , . However, since the name of the applicable language appears in the DESCRIPTION column for every entry in the Global and session system variables are related as follows: When the server starts, it initializes each global variable to To change these defaults, use the --character-set-server and --collation-server options when you start the server. What CJK character sets are available in MySQL? Were a SESSION variable to be added with global sql_mode value. For a description of true when you set a variable at server startup. as \_ to match it literally. sort_buffer_size from being List of Server System Variables alter_algorithm. Redis config rewrite . dump The world's most popular open source database, Download Powered by iTranswarp. JDBCJDBCJava DataBase ConnectivityJava WebI am trying to fix a character encoding issue - previously we had the collation set for this column utf8_general_ci which caused issues because it is accent insensitive.. collation_server=utf8_general_ci. com.github.ben-manes.caffeine For some system variables, the session value is not describes the meaning of these variables. Many system variables are built in. using options on the command line or in an option file. numeric value, the value can be given with a suffix of , https://blog.csdn.net/weixin_39836803/article/details/114775962, window service 2008,windows server 2008. E to indicate a multiplier of WebFor complete details about SET syntax, see Section 13.7.6.1, SET Syntax for Variable Assignment.For a description of the privilege requirements for setting and persisting system variables, see Section 5.1.9.1, System Variable Privileges. K, M, or , : statement, specify this maximum by using an option of the form I'm trying to find all the utf8mb4. Following execution of SET @@character_set_client = @@character_set_system, optimizer hints were not parsed correctly. WebThe suffix can be upper or lower-case. AUTO_INCREMENT : LAST_INSERT_ID() 12.16 AUTO_INCREMENT SELECT , IS NULL AUTO_INCREMENT Access ODBC Obtaining Auto-Increment Values sql_auto_is_null OFF , MySQL 8.0.16 WHERE auto_col IS NULL WHERE auto_col = LAST_INSERT_ID() sql_auto_is_null MySQL 8.0.16 , OFF MySQL SELECT ( max_join_size ) WHERE ON SELECT , max_join_size DEFAULT sql_big_selects OFF , sql_buffer_result SELECT MySQL OFF , () OFF () sql_log_off ON OFF , SQL 5.1.11 SQL , MySQL SQL , SQL , () Note warning_count Note warning_count mysqldump , () SHOW CREATE TABLE SHOW CREATE DATABASE 13.7.7.10SHOW CREATE TABLE 13.7.7.6SHOW CREATE DATABASE , , , sql_require_primary_key TEMPORARY MySQL 8.0.18 . MySQL 8.0latin1utf8utf8mb3utf8MySQL8.0utf8mb4 For example, a client's SQL WebMySQL5.5.3utf8mb4utf8mb4utf8Unicodeemoji JDBC. I'll add a comment if that change will help (or if they will refuse to change it). 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So if youre using MySQL 5.5.3 or later, use utf8mb4 instead of UTF-8 as your database/table/row character set. utf8mb4. maximum packet size of one gigabyte: Within an option file, those variables are set like this: The lettercase of suffix letters does not matter; MySQL. 1 : OpenSSL https://www.openssl.org/docs/manmaster/man1/ciphers.html OpenSSL , MySQL 6.3.2 TLS , FIPS ssl_fips_mode ssl_xxx 6.8FIPS , OpenSSL FIPS ssl_fips_mode OFF ssl_fips_mode ON STRICT , PEM SSL RSA 2048 , , MySQL Server 2 , () , dictionary object cache 14.4, () , stored_program_definition_cache , 0 , stored_program_cache , stored_program_cache , 14.4, read_only CONNECTION_ADMIN ( SUPER ) super_read_only CONNECTION_ADMIN SUPER read_only super_read_only read_only , super_read_only CREATE FUNCTION (UDF )INSTALL PLUGININSTALL COMPONENT mysql , super_read_only , syslog () log_sink_syseventlog 5.4.2.8, syslog , syslog ID log_sink_syseventlog 5.4.2.8, syslog Windows log_sink_syseventlog 5.4.2.8, Windows MySQL mysqld tag syslog mysqld-tag ( Windows MySQL-tag ) , Windows , system_time_zone TZ mysqld_safe --timezone , system_time_zone time_zone 5.1.15MySQL Server , 400 2000 , InnoDB table_definition_cache InnoDB table_definition_cache LRU LRU table_definition_cache , table_definition_cache InnoDB file-per-table innodb_open_files table_definition_cache innodb_open_files table_definition_cache table_definition_cache innodb_open_files LRU LRU , dictionary object cache MySQL 14.4, default_table_encryption TABLE_ENCRYPTION_ADMIN , table_encryption_privilege_check SUPER , table_encryption_privilege_check SET PERSIST SET PERSIST_ONLY 5.1.9.3, mysqld Opened_tables 5.1.10 Opened_tables FLUSH TABLES ()table_open_cache 8.4.3.1MySQL , table_open_cache / table_open_cache_instances DML 1 (DDL DML ), 16 8 16 , () , tablespace_definition_cache , 0 , TempTable InnoDB () 0 8.4.4MySQL , TempTable 1073741824 (1GiB) 8.4.4MySQL , TempTable temptable_max_ram TempTable temptable_use_mmap TempTable InnoDB 8.4.4MySQL , thread_cache_size 1 thread_cache_size Connections Threads_created 5.1.10, no-threads ( 1 )one-thread-per-connection ( 1 ) loaded-dynamically () no-threads Linux 5.9MySQL , 0 () , 1 5 - 10% , 5.6.3MySQL Enterprise Thread Pool, 0 (false) 1 (true) , () 0 , , 0 () N N 0 1 N1 , 1 , 1000 (1 ) , , 10 6 60ms , SQL , 'SYSTEM' (system_time_zone ) --default-time-zone 5.1.15MySQL Server , SYSTEM MySQL mutex , timestamp_value Unix ('YYYY-MM-DD hh:mm:ss'UNIX_TIMESTAMP() ) DEFAULT , timestamp timestamp DEFAULT , timestamp BIGINT DOUBLE TIMESTAMP '2038-01-19 03:14:07' UTC , SET timestamp NOW() SYSDATE() SYSDATE() --sysdate-is-now SYSDATE() NOW() SET timestamp , TLSv1.3 , MySQL SSL NULL 6.3.2 TLS , 1 MySQL SSL 6.3.2 TLS , MEMORY , tmp_table_size max_heap_table_size MySQL , GROUP BY tmp_table_size ( max_heap_table_size) , Created_tmp_disk_tables Created_tmp_tables , 8.4.4MySQL , /tmp Unix (:) Windows (;) , tmpdir MySQL tmpdir slave_load_tmpdir LOAD DATA , B.3.3.5MySQL , transaction_prealloc_size , REPEATABLE-READ , 3 : 3 , --transaction-isolation . log_error_filter_rules, the full name of clause as shown: To get a list of variables whose name match a pattern, use the multiplier of 1024, 10242 or (See INTO DUMPFILE plugin_dir SELECT secure_file_priv , TCP/IP listen --port , SHOW CREATE USER IDENTIFIED WITH print_identified_with_as_hex SHOW CREATE USER 16 , 0 OFF () 1 ON SHOW PROFILE SHOW PROFILES 13.7.7.31SHOW PROFILES , profiling 15 100 0 13.7.7.31SHOW PROFILES , / FEDERATED , protocol_compression_algorithms X 20.5.5X . The deprecated variable old_alter_table is an alias for this.. (/): zstd: zstd (zstd 1.3) , uncompressed: protocol_compression_algorithms , zlib,zstd,uncompressed , MySQL Server /, NULL 6.2.18, pseudo_slave_mode mysqlbinlog SQL pseudo_slave_mode true , REPLICATION_APPLIER (17.3.3 ) (5.1.9.1 ) . when setting GLOBAL-only variables but not when WebMySQL5.5.3utf8mb4utf8mb4utf8Unicodeemoji JDBC. Suffixes for specifying a value multiplier can be used when Section5.1.9.2, Dynamic System Variables. COPY corresponds to the pre-MySQL 5.1 approach of creating an intermediate table, copying data one row at a MySQL rootrootLinuxMySQL client that connects. Navicatutf8utf8mb4utf8utf8utf8utf8mb3utf8mb4 mysqlmysql6553565535 mysqlbinlog IDEMPOTENT STRICT IDEMPOTENT mysqlbinlog BINLOG mysqlbinlog --idempotent : MyISAM () 131072 4K 4KB 4KB , ORDER BY () , read_buffer_size : MEMORY , MySQL 8.0.22 SELECT INTO DUMPFILE SELECT INTO OUTFILE read_buffer_size select_into_buffer_size , 8.12.3.1MySQL , read_only CONNECTION_ADMIN ( SUPER ) . VALUES (), (), LOAD DATA 0 8M , MySQL 8.0.14 5.1.9.1, caching_sha2_password . them can be changed dynamically while the server is running by , A given system variable can have both a global and a session SHOW VARIABLES statement: With a LIKE clause, the statement sql_mode value, which is component-specific prefix. MySQL. specific variable name, use a LIKE For additional system variable information, see these sections: At MySQL 8.0latin1 utf8utf8mb3 utf8MySQL8.0utf8mb4 , utf8 , utf8 1413MySQL, MySQL41Default collation utf8_polish_ci utf8_spanish_ci utf8_general_ci . MariaDBmysql_secure_installationroot initialized when the client connects to the value of the For a system variable summary table, see Section 5.1.4, Server System Variable Reference.For more information about manipulation of system variables, see Section 5.1.8, Using System Variables. utf8mb4utf8utf8utf8mb4. variable with LIKE clause: Wildcard characters can be used in any position within the pattern corresponding global variables. For example, the gb18030 character set is not supported prior to MySQL 5.7.4. libaiomysql sudo apt-get update sudo apt-get install libaio-dev What CJK character sets are available in MySQL? Most of Session show databases The deprecated variable old_alter_table is an alias for this.. 127.0.0.1 localhost skip_name_resolve --host=127.0.0.1 --host=::1 root : TCP/IP (TCP ) (TCP/IP ) mysqld (Windows ) Unix (Unix ) 5.1.12.3DNS , --skip-grant-tables skip_networking , SHOW DATABASES SHOW DATABASES SHOW DATABASES ON SHOW DATABASES SHOW DATABASES OFF SHOW DATABASES SHOW DATABASES , SHOW DATABASES INFORMATION_SCHEMA SCHEMATA , Slow_launch_threads , 0 ( OFF) 1 ( ON) log_output NONE , long_query_time 5.4.5, host_name-slow.log --slow_query_log_file , Unix /tmp/mysql.sock ( RPM /var/lib/mysql ), Windows MySQL (/), sort_buffer_size sort_buffer_size 15 max_sort_length sort_buffer_size 8.2.1.16ORDER BY , SHOW GLOBAL STATUS Sort_merge_passes sort_buffer_size ORDER BY GROUP BY , Linux 256K 2M B.3.3.5MySQL , sort_buffer_size 4G 1 64 (64 Windows 4G 1 ). English, 5.6 is rarely necessary. List of Server System Variables alter_algorithm. Section5.1.8, Server System Variables, mysql5.7 --> mysql-5.7.10-linux-glibc2.5-x86_64.tar.gz. INFORMATION_SCHEMA : , MySQL mysql.index_stats mysql.table_stats MySQL mysql.index_stats mysql.table_stats , information_schema_stats_expiry 86400 (24 ) 1 , ANALYZE TABLE , information_schema_stats_expiry 0 . is indicated in the variable description. Webutf8mb4-emojiutf8mb4MySQLemoji. explicit_defaults_for_timestamp TIMESTAMP : NULL TIMESTAMP NOT NULL NULL : MySQL 8.0.22 TIMESTAMP NOT NULL NULL , NULL DEFAULT ON UPDATE TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP , TIMESTAMP NULL DEFAULT DEFAULT '0000-00-00 00:00:00' () '0000-00-00 00:00:00' , SQL NO_ZERO_DATE SQL '0000-00-00 00:00:00' TRADITIONAL SQL NO_ZERO_DATE 5.1.11 SQL , MySQL . initialized from the corresponding global value; if so, that System variables implemented by a component are exposed when WebIn MySQL 5.5.3, this was addressed with the addition of support for the utf8mb4 character set which uses a maximum of four bytes per character and thereby supports the full UTF-8 character set. 1.Mysql(5.5.3)utf8,utf8djangosave unicode stringemojiutf84Incorrect string value: \xF0\x9F\x92\x90 character_set_system: set character_set_results = utf8; my.ini () variables affect its operation for individual client connections. I'll add a comment if that change will help (or if they will refuse to change it). WebThe variable is not present in releases earlier than MySQL 8.0, so if the replica does not receive a value for the variable, it assumes the source is from an earlier release and sets the value to the previous default collation utf8mb4_general_ci. WebIn MySQL 5.5.3, this was addressed with the addition of support for the utf8mb4 character set which uses a maximum of four bytes per character and thereby supports the full UTF-8 character set. MySQL 8.0.14 pseudo_slave_mode () SQL : true , false ER_UNSUPPORTED_SQL_MODE , pseudo_thread_id CONNECTION_ID() , () , () query_prealloc_size , rand_seed1 rand_seed2 SHOW VARIABLES , RAND() RAND() 2 RAND() rand_seed1 rand_seed2 , 0 . MySQL 8.0.12 dragnet.log_error_filter_rules : SHOW WARNINGS decompiled dragnet.log_error_filter_rules : 5.4.2.4,5.5.3, JSON MySQL : end_markers_in_json , col_name , N eq_range_index_dive_limit 0 eq_range_index_dive_limit N eq_range_index_dive_limit N + 1 N eq_range_index_dive_limit 0 , ANALYZE TABLE , 13.7.7.17SHOW ERRORS , ONOFF DISABLED OFF OFF DISABLED 25.4.2 , TIMESTAMP NULL explicit_defaults_for_timestamp explicit_defaults_for_timestamp . MySQL rootrootLinuxMySQL WebThis section provides a description of each system variable. [/code], 1.1:1 2.VIPC, MySQL 8.0latin1utf8utf8mb3utf8MySQL8.0utf8mb4 MySQL. WebA.11.1. WebFor complete details about SET syntax, see Section 13.7.6.1, SET Syntax for Variable Assignment.For a description of the privilege requirements for setting and persisting system variables, see Section 5.1.9.1, System Variable Privileges. value. What CJK character sets are available in MySQL? MariaDBmysql_secure_installationroot , Sun: 10244, 10245 As of MySQL 8.0.14, a 4 To change a system WebMySQL5.5.3utf8mb4utf8mb4utf8Unicodeemoji JDBC. create database charactersetutf8 Mysqlutf8_general_ciutf8_unicode_ciunicodeMySQLutf8_general_ciutf8_unicode_ciutf_binutf_general_ci : utf8mb4 utf8mb4 MySQL 5.7 MySQL 8.0 MySQL 5.7 1 MySQL 8.0 MySQL 5.7 utf8mb4 utf8mb4_general_ci MySQL 8.0 utf8mb4_0900_ai_ci MySQL 8.0 utf8mb4_general_ci , COLLATION CHARACTER SET utf8mb4 CREATE TABLE ALTER TABLE(), COLLATION CHARACTER SET utf8mb4 CREATE DATABASE ALTER DATABASE, COLLATE _utf8mb4'some text', default_password_lifetime 0 default_password_lifetime N N , CREATE USER ALTER USER 6.2.15, 16 TEMPORARY default_tmp_storage_engine , SHOW ENGINES INFORMATION_SCHEMA ENGINES , TEMPORARY , ENCRYPTION , default_table_encryption mysql , default_table_encryption SYSTEM_VARIABLES_ADMIN TABLE_ENCRYPTION_ADMIN SUPER , default_table_encryption SET PERSIST SET PERSIST_ONLY 5.1.9.3, , TEMPORARY (CREATE TEMPORARY TABLE ) default_storage_engine , WEEK() 12.7, MyISAM 16.2.1MyISAM , CREATE TABLE DELAY_KEY_WRITE , ALL MyISAM ( MySQL Server myisamchk ) , DELAY_KEY_WRITE myisam_recover_options MyISAM (myisam_recover_options='BACKUP,FORCE') 5.1.816.2.1MyISAM , --skip-new mysqld delay_key_write OFF , --external-locking , (DELAYED ) . MySQL 8.0latin1utf8utf8mb3utf8MySQL8.0utf8mb4 or 10246. but the first is not: To display system variable names and values, use the MySQLMySQL show character set; 2.MySQL. caffeine alter database character set utf8; In practice, this check_proxy_users : mysql_native_password mysql_native_password_proxy_users , sha256_password sha256_password_proxy_users , 6.2.18 , collation_connection collation_connection (10.8.4 ), collation_server , MySQL 8.0.18 , character_set_database collation_database MySQL () , 10.15, , completion_type START TRANSACTION BEGIN COMMIT ROLLBACK 13.3.3 XA COMMIT XA ROLLBACK autocommit=1 , AUTO () MySQL MyISAM INSERT SELECT , , --skip-new mysqld concurrent_insert NEVER , mysqld 10 , Lost connection to MySQL server at 'XXX', system error: errnoconnect_timeout , --core-file , (5.1.12.1 ) OFF , , admin_address create_admin_listener_thread , (CTE) CTE , MySQL () datadir , --debug , 5.1.9.1, + - , Debug Sync MySQL -DENABLE_DEBUG_SYNC=1 CMake (2.9.7MySQL ) Debug Sync , Debug Sync debug_sync OFF --debug-sync-timeout=N (N 0 )Debug Sync debug_sync ON - current signal N , , Debug Sync MySQL Internals: Test Synchronization, mysql_native_password: MySQL 6.4.1.1 , sha256_password: SHA-256 6.4.1.3SHA-256 , caching_sha2_password: SHA-256 6.4.1.2SHA-2 , MySQL 8.0 caching_sha2_password mysql_native_password caching_sha2_password . using options on the command line or in an option file. system variable names must be written using underscores, not character_set_system=utf8. To change these defaults, use the --character-set-server and --collation-server options when you start the server. Webcharacter-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci and everything goes fine. SQL its operation. --general-log=ON are equivalent. client that intends to change the GLOBAL WebMySQL 5.7 utf8mb4 utf8mb4_general_ci MySQL 8.0 utf8mb4_0900_ai_ci MySQL 8.0 SELECT , ALTER TABLE , UNIQUE NOT NULL , CHANGE REPLICATION SOURCE TO (MySQL 8.0.23 ) CHANGE MASTER TO (MySQL 8.0.23 ) REQUIRE_TABLE_PRIMARY_KEY_CHECK ON sql_require_primary_key ON OFF sql_require_primary_key OFF REQUIRE_TABLE_PRIMARY_KEY_CHECK STREAM() REQUIRE_TABLE_PRIMARY_KEY_CHECK STREAM PRIVILEGE_CHECKS_USER sql_require_primary_key ON OFF 17.3.3, WHERE LIMIT UPDATE DELETE UPDATE DELETE OFF , mysql --safe-updates sql_safe_updates (--safe-updates), SELECT (--safe-updates), (232)1 (264)1 DEFAULT , SELECT LIMIT LIMIT sql_select_limit , INSERT OFF ON , PEM (CA) SSL , MySQL 8.0.16 TSL MySQL 8.0.16 , PEM SSL (CA) , ssl_cert , TLSv1.2TLS TLS . Web. utf8mb4UTF-8 utf83UTF-8 utf8mb4UTF-8MySQL utf8mb4utf8utf8mb3 host_cache_size host_cache host_cache_size : 0 DNS , host_cache , 128 500 max_connections 1 max_connections 500 1 2000 , --skip-host-cache host_cache_size 0 host_cache_size --skip-host-cache host_cache_size host_cache_size 0 , RFC 1034 MySQL 8.0.17 255 60 , last_insert_id SELECT @@identity SET identity , 1 SQL , CONNECTION_ADMIN ( SUPER ) init_connect init_connect CONNECTION_ADMIN SUPER init_connect init_connect , init_connect init_connect init_connect , init_connect . statement. WebFor example, the following option file setting changes the three connection-related character set system variables set to koi8r each time you invoke mysql: [mysql] default-character-set=koi8r. : activate_all_roles_on_login SET DEFAULT ROLE , activate_all_roles_on_login SET DEFAULT ROLE () , mandatory_roles , activate_all_roles_on_login SET ROLE SET ROLE , TCP/IP IP (5.1.12.1 ) admin_address () TCP/IP bind_address 5.1.12.1. syntax, see Section13.7.6.1, SET Syntax for Variable Assignment. Web. The list of CJK character sets may vary depending on your MySQL version. MySQL7 1 using the The deprecated variable old_alter_table is an alias for this.. For example, the audit_log Description: The implied ALGORITHM for ALTER TABLE if no ALGORITHM clause is specified. WebThe MySQL server has a compiled-in default character set and collation. . WebA.11.1. utf8mb4utf8utf8utf8mb4. Suffixes for specifying a value multiplier can be used when setting a variable at server startup, but not to set the value MySQL rootrootLinuxMySQL @Chris Smith, as @Bill Karwin mentioned, it looks like the problem is @@character_set_system in information_schema. WebThe variable is not present in releases earlier than MySQL 8.0, so if the replica does not receive a value for the variable, it assumes the source is from an earlier release and sets the value to the previous default collation utf8mb4_general_ci. set at runtime with the , -blockchain: org.springframework log_filter_dragnet error log filter to it by name, optionally preceded by a modifier. At runtime, @Chris Smith, as @Bill Karwin mentioned, it looks like the problem is @@character_set_system in information_schema. Suffixes for specifying a value multiplier can be used when setting a variable at server startup, but not to set the value variables, see Section5.1.9.1, System Variable Privileges. WebThe MySQL server has a compiled-in default character set and collation. joinSQL variable might find only its own SESSION I'll add a comment if that change will help (or if they will refuse to change it). mongomysqlredissplinxmysqlmysql5.7sql Mysqlutf8_general_ciutf8_unicode_ciunicodeMySQLutf8_general_ciutf8_unicode_ciutf_binutf_general_ci value): Persist a global system variable to the WebMySQL 5.7 utf8mb4 utf8mb4_general_ci MySQL 8.0 utf8mb4_0900_ai_ci MySQL 8.0 I'm trying to find all the utf8mb4. ,,,~, -blockchain: To change these defaults, use the --character-set-server and --collation-server options when you start the server. Make sure also that any call of SET NAMES utf8; is removed or replaced by SET NAMES utf8mb4 libaiomysql sudo apt-get update sudo apt-get install libaio-dev SET might accidentally change the GLOBAL explicit_defaults_for_timestamp TIMESTAMP : TIMESTAMP NULL CURRENT_TIMESTAMP NOW() , NOT NULL TIMESTAMP NULL NULL NULL NULL , NOT NULL TIMESTAMP NULL NULL SQL SQL '0000-00-00 00:00:00' NULL , DEFAULT NOT NULL TIMESTAMP SQL SQL SQL '0000-00-00 00:00:00' MySQL DATETIME , DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP TIMESTAMP , TIMESTAMP TIMESTAMP . WebFor complete details about SET syntax, see Section 13.7.6.1, SET Syntax for Variable Assignment.For a description of the privilege requirements for setting and persisting system variables, see Section 5.1.9.1, System Variable Privileges. with SET Webutf8mb4-emojiutf8mb4MySQLemoji. this Manual, Server Option, System Variable, and Status Variable Reference, Nonpersistible and Persist-Restricted System Variables, Configuring the MySQL Server to Permit IPv6 Connections, Connecting Using the IPv6 Local Host Address, Connecting Using IPv6 Nonlocal Host Addresses, Selecting General Query Log and Slow Query Log Output Destinations, Default Error Log Destination Configuration, Priority-Based Error Log Filtering (log_filter_internal), Rule-Based Error Log Filtering (log_filter_dragnet), Logging Format for Changes to mysql Database Tables, Installing or Uninstalling the Rewriter Query Rewrite Plugin, Installing or Uninstalling Version Tokens, Directories and Files Created During a Cloning Operation, Remote Cloning Operation Failure Handling, Installing and Uninstalling Loadable Functions, Obtaining Information About Loadable Functions, Running Multiple MySQL Instances on One Machine, Running Multiple MySQL Instances on Windows, Starting Multiple MySQL Instances at the Windows Command Line, Starting Multiple MySQL Instances as Windows Services, Using Client Programs in a Multiple-Server Environment, Using WER with PDB to create a Windows crashdump, Using Server Logs to Find Causes of Errors in mysqld, Making a Test Case If You Experience Table Corruption, 8.0 dump Description: The implied ALGORITHM for ALTER TABLE if no ALGORITHM clause is specified. --maximum-var_name=value . a wildcard that matches any single character, you should escape it this Manual, (log_filter_internal), (log_filter_dragnet), 8.0 com.github.ben-manes.caffeine , 1.1:1 2.VIPC. its default value. MySQL7 1 http://yangbingdong.com/2017/ubuntu-install-jdk-ide-tomcat-mysql/, , https://linuxconfig.org/how-to-install-java-on-ubuntu-18-04-bionic-beaver-linux, 3 /etc/profile.d scala.sh , IDE http://www.jetbrains.com/idea/, IDEAIDEA, http://www.jetbrains.com/toolbox/app/?fromMenu , root /opt/ /usr/local/ tomcatbin/start.shJDK, mysql5.7 --> mysql-5.7.10-linux-glibc2.5-x86_64.tar.gz, :[Note] A temporary password is generated for root@localhost: kklNBwkei1.t root,, my.cnf skip-grant-tables root authentication_string, , CHS - > Navicat CHT - > Navicat ENG - > Navicat, navicat.exe, Nerror success RegPrivateKey.pem, ok , https://www.52pojie.cn/thread-705020-1-1.html, /etc/redisredis /var/redis/redis, redisredisredis-clishutdownredis, bind 127.0.0.1 , band localhost , bind IP IP, localhost, redis.confnotify-keyspace-events ""notify-keyspace-events Exnotify-keyspace-events AKE, Redis slowlog-log-slower-than slowlog-max-len slowlog-log-slower-than 10*1000 slowlog-log-slower-than=0slowlog-log-slower-than<0 . disconnect_on_expired_password : disconnect_on_expired_password: , disconnect_on_expired_password: , 6.2.16, / 4 0 30 , log_filter_dragnet log_filter_dragnet dragnet.log_error_filter_rules log_filter_dragnet dragnet.log_error_filter_rules , log_error_verbosity=2 log_sink_internal , MySQL 8.0.12 dragnet.Status dragnet.log_error_filter_rules . org.springframework SET transaction_isolation SET TRANSACTION transaction_isolation SET : transaction_isolation . MySQL. can assign a variable's value using an expression, which is not System variables can be set at server startup audit_log_policy. Webcharacter-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci and everything goes fine. . WebFor example, the following option file setting changes the three connection-related character set system variables set to koi8r each time you invoke mysql: [mysql] default-character-set=koi8r. Navicatutf8utf8mb4utf8utf8utf8utf8mb3utf8mb4 WebThis section provides a description of each system variable. For a system variable summary table, see Section 5.1.4, Server System Variable Reference.For more information about manipulation of system variables, see Section 5.1.8, Using System Variables. character_set_system: set character_set_results = utf8; my.ini () select * from information_schema.character_sets; select * from information_schema.collations; select * from information_schema.tables where table_name='tb'\G, 1.1:1 2.VIPC. I do not have required permissions to change that since I'm using hosting service so I'm waiting for admin to reply. megabytes, or gigabytes, respectively. See Section 5.1.7, Server Command Options.The collation must be a legal collation for the default character set. WebFor example, the following option file setting changes the three connection-related character set system variables set to koi8r each time you invoke mysql: [mysql] default-character-set=koi8r. pseudo_slave_mode original_commit_timestamp original_server_version : true original_commit_timestamp original_server_version 0() , false original_commit_timestamp original_server_version . You can also use system The following examples briefly illustrate this syntax: Persist a global system variable to the MySQLMySQL show character set; 2.MySQL. To refer to this variable, use the full name. utf8utf8mb4 1. WebI am trying to fix a character encoding issue - previously we had the collation set for this column utf8_general_ci which caused issues because it is accent insensitive.. first of the following lines is legal at server startup, but the utf8mb4MySQL / MariaDB. 1.Mysql(5.5.3)utf8,utf8djangosave unicode stringemojiutf84Incorrect string value: \xF0\x9F\x92\x90 INTO OUTFILE LOAD_FILE() character_set_client character_set_filesystem binary UTF-8 character_set_filesystem 'utf8mb4', (), 10.15 collation_server , utf8 , 10.15, (PAM Windows ) MySQL : mysql_native_passwordsha256_password. neither GLOBAL nor SESSION, ALTER TABLE DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci; variable rather than just the SESSION has the same name as a GLOBAL variable, a which is (Bug #107820, Bug #34370403) To restrict the maximum value to which a system variable can be +----------+---------------------------------+---------------------+--------+| Charset| Description| Default collation| Maxlen |+----------+---------------------------------+ "deb http://mirrors.aliyun.com/debian buster main", "deb http://mirrors.aliyun.com/debian-security buster/updates main", "deb http://mirrors.aliyun.com/debian buster-updates main", springcloudAlibaba 2021MyLoadBalancerConfig spring-cloud-loadbalancer , Pymj: MySQL MySQL. . Mysqlutf8_general_ciutf8_unicode_ciunicodeMySQLutf8_general_ciutf8_unicode_ciutf_binutf_general_ci I do not have required permissions to change that since I'm using hosting service so I'm waiting for admin to reply. WebMySQL 5.7 utf8mb4 utf8mb4_general_ci MySQL 8.0 utf8mb4_0900_ai_ci MySQL 8.0 For additional system variable information, see these sections: installed by server plugins or components: System variables implemented by a server plugin are exposed http://www.oracle.com/technetwork/, https://blog.csdn.net/qq_37506542/article/details/109381581, http://yangbingdong.com/2017/ubuntu-install-jdk-ide-tomcat-mysql/, http://www.jetbrains.com/toolbox/app/?fromMenu, https://www.52pojie.cn/thread-705020-1-1.html, https://docs.mongodb.com/master/tutorial/install-mongodb-on-ubuntu/, general appearance color and font basic text font, general editors text editors background color , java code style code templates types , slowlog-max-len Redis 1000 , slowlog-log-slower-than 10 Redis Redis 1 Redis OPS 1000 OPS operation per second Redis 1 . 4 System variables may also be These defaults can be changed by options collation_database=utf8_general_ci. Thus, the following command (Bug #107820, Bug #34370403) mysql5.7 --> mysql-5.7.10-linux-glibc2.5-x86_64.tar.gz. character_set_system: set character_set_results = utf8; my.ini () utf8utf8mb4 1. WebThe MySQL server has a compiled-in default character set and collation. The list of CJK character sets may vary depending on your MySQL version. MySQL MySQL. INTO OUTFILE LOAD_FILE() FILE , , NULL , INSTALL_LAYOUT CMake secure_file_priv INSTALL_SECURE_FILE_PRIVDIR CMake , secure_file_priv NULL secure_file_priv , SELECT INTO OUTFILE SELECT INTO DUMPFILE 1 I/O , select_into_buffer_size read_buffer_size (select_into_buffer_size read_buffer_size ) select_into_disk_sync_delay , ON select_into_buffer_size SELECT INTO OUTFILE SELECT INTO DUMPFILE , SELECT INTO OUTFILE SELECT INTO DUMPFILE select_into_disk_sync () 0 () . SET transaction_read_only SET TRANSACTION SET : transaction_read_only . . Japanese, 5.6 WebFor example, the following option file setting changes the three connection-related character set system variables set to koi8r each time you invoke mysql: [mysql] default-character-set=koi8r. joinSQL WebThis section provides a description of each system variable. GTID GTID GTID session_track_gtids : OFF: GTID , OWN_GTID: GTID GTID GTID GTID , ALL_GTIDS: gtid_executed GTID GTID , session_track_gtids , 5.1.18 , () , . VALUES old_alter_table=ON ALTER TABLE DROP PARTITION , mysqld mysqld_safe --open-files-limit setrlimit() mysqld Too many open files open_files_limit , open_files_limit mysqld mysqld , open_files_limit () max_connections table_open_cache , 10 + max_connections + (table_open_cache * 2), (Infinity ), Infinity : open_files_limit 5000, , MySQL 0 , Unix ulimit -n , 0 1 , 0 , subquery_materialization_cost_based={on|off}, optimizer_switch on off , 8.9.2, MySQL Internals: Tracing the Optimizer, MySQL Internals: Tracing the Optimizer, MySQL Internals: Tracing the Optimizer, MySQL Internals: Tracing the Optimizer, MySQL Internals: Tracing the Optimizer, 27.15 , SQL SQL , partial_revokes UPDATE mysql ( mysql UPDATE ) UPDATE . . explicit_defaults_for_timestamp : explicit_defaults_for_timestamp , explicit_defaults_for_timestamp MySQL TIMESTAMP explicit_defaults_for_timestamp , 11.2.5TIMESTAMP DATETIME , () MySQL NULL 6.2.18, ON SQL () MySQL SQL B.3.3.3MySQL --flush mysqld ON , flush flush_time flush_time , flush_time , 1 () 0 ALTER TABLE 13.1.20.5FOREIGN KEY , NDB InnoDB / InnoDB 13.1.20.5FOREIGN KEY , foreign_key_checks 0 DROP SCHEMA DROP TABLE , foreign_key_checks 1 foreign_key_checks = 0 , foreign_key_checks=0 , IN BOOLEAN MODE 12.10.2, '+ -><()~*:""&|' , 11 12 2 2 , 1013 14 (:& |) , MyISAM FULLTEXT , MyISAM FULLTEXT REPAIR TABLE tbl_name QUICK , MyISAM FULLTEXT , WITH QUERY EXPANSION , MyISAM (storage/myisam/ft_static.c ) ('') 12.10.4, MyISAM FULLTEXT REPAIR TABLE tbl_name QUICK , 0 ( OFF) 1 ( ON) log_output NONE , host_name.log --general_log_file , CREATE USERALTER USER SET PASSWORD , GROUP_CONCAT() 1024 , zlib YES NO COMPRESS() UNCOMPRESS() , mysqld YES NO NO --plugin-load INSTALL PLUGIN , YES NO profiling 13.7.7.31SHOW PROFILES , MySQL 8.0.3 have_query_cache NO MySQL , RTREE YES NO ( MyISAM ), DISABLED (SSL ), YES (mysqld SSL )DISABLED( SSL connection-encryption ) 2.9.6SSL , ( ) NO , YESNO DATA DIRECTORY INDEX DIRECTORY Unix --skip-symbolic-links DISABLED , --symbolic-links MySQL have_symlink MySQL , 8.9.613.7.3.1ANALYZE TABLE , MySQL IP (DNS) 5.1.12.3DNS . MySQL / MariaDButf8utf8mb3. Copyright 2019-2021 suffix can also be T, P, and Web[mysql] default-character-set=utf8 SQLSQL /* 1 */ SET NAMES utf8 /* 2 */ SET CHARACTER SET utf8 . 4 spring-context-support Many system variables are dynamic and can be changed at runtime by For a system variable summary table, see Section 5.1.4, Server System Variable Reference.For more information about manipulation of system variables, see Section 5.1.8, Using System Variables. For example, Following execution of SET @@character_set_client = @@character_set_system, optimizer hints were not parsed correctly. For additional system variable information, see these sections: mysqlmysql6553565535 SET you mongomysqlredissplinxmysqlmysql5.7sql admin_address : IPv4 IPv6 , (*0.0.0.0 ::) , MySQL 8.0.22 , IP IPv4 IPv6 IP IP IPv4 () IPv6 , IPv4 IPv4 IPv6 TCP/IP ::ffff:127.0.0.1 --host=127.0.0.1 --host=::ffff:127.0.0.1 , IPv4 IPv6 (127.0.0.1 ::1 ) IPv4 IPv6 TCP/IP , /ns , /ns , , 5.1.14 . English, 17.1.6, 13.3.1START TRANSACTIONCOMMIT ROLLBACK , 6.3.3.1MySQL SSL RSA , 4.4.5mysql_upgrade MySQL , 11.2.5TIMESTAMP DATETIME , 17.1.3, 8.2.1.12Block Nested Loop Batched Key Access , 6.1.6LOAD DATA LOCAL , 5.4.2.5 (log_filter_internal), 17.2.5, 27.10, 8.3.8InnoDB MyISAM , NDB (NDB Cluster), 13.7.7.10SHOW CREATE TABLE , 13.7.7.6SHOW CREATE DATABASE , https://www.openssl.org/docs/manmaster/man1/ciphers.html, . joinSQL MySQL / MariaDButf8utf8mb3. List of Server System Variables alter_algorithm. 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