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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-setup-instruments-table.html
When an instrument is enabled and executed, instrumented instances are created, which are visible in the xxx_instances tables, such as file_instances or rwlock_instances. This column can be modified, although setting ENABLED has no effect for ...
https://dev.mysql.com/doc/refman/5.7/en/problems-with-float.html
Suppose that you execute the following statements: CREATE TABLE t1(c1 FLOAT(53,0), c2 FLOAT(53,0)); INSERT INTO t1 VALUES('1e+52','-1e+52'); SELECT * FROM t1; On some platforms, the SELECT statement returns inf and -inf. An implication of the ...
https://dev.mysql.com/doc/refman/5.7/en/rebuilding-tables.html
If you need to rebuild an InnoDB table because a CHECK TABLE operation indicates that a table upgrade is required, use mysqldump to create a dump file and mysql to reload the file. For example, if t1 is an InnoDB table, use this statement: ALTER ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-directory.html
If a DATA DIRECTORY or INDEX DIRECTORY table option is used in a CREATE TABLE statement on the source server, the table option is also used on the replica. This can be overridden by using the NO_DIR_IN_CREATE server SQL mode on the replica, which ...This can cause problems if no corresponding directory exists in the replica host's file system or if it exists but is not accessible to the replica ...
https://dev.mysql.com/doc/refman/5.7/en/replication-rules.html
The rules governing such filters are the same whether they are created on startup using --replicate-* options or while the replica server is running by CHANGE REPLICATION FILTER. For statements affecting databases only (that is, CREATE DATABASE, ...
https://dev.mysql.com/doc/refman/5.7/en/replication-setup-replicas.html
To do this, execute the following statement on the replica, replacing the option values with the actual values relevant to your system: mysql> CHANGE MASTER TO -> MASTER_HOST='source_host_name', -> MASTER_USER='replication_user_name', -> ...Before ...
https://dev.mysql.com/doc/refman/5.7/en/selinux-troubleshooting.html
In such cases, you can use the audit2allow utility to create custom policies to permit access where it is required. The typical method for creating custom policies is to change the SELinux mode to permissive, identify access denial messages in the ... Troubleshooting SELinux typically involves placing SELinux into permissive mode, rerunning problematic operations, checking for access denial messages in the SELinux audit log, and placing SELinux back into enforcing mode after problems are ...
https://dev.mysql.com/doc/refman/5.7/en/show-columns.html
The data types may differ from what you expect them to be based on a CREATE TABLE statement because MySQL sometimes changes data types when you create or alter a table. The SHOW CREATE TABLE, SHOW TABLE STATUS, and SHOW INDEX statements also provide ... SHOW [FULL] {COLUMNS | FIELDS} {FROM | IN} tbl_name [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW COLUMNS displays information about the columns in a given ...
https://dev.mysql.com/doc/refman/5.7/en/stored-programs-defining.html
Each stored program contains a body that consists of an SQL statement. This statement may be a compound statement made up of several statements separated by semicolon (;) characters. For example, the following stored procedure has a body made up of ...
https://dev.mysql.com/doc/refman/5.7/en/stored-routines-metadata.html
Use the SHOW CREATE PROCEDURE and SHOW CREATE FUNCTION statements to see routine definitions. To obtain metadata about stored routines: Query the ROUTINES table of the INFORMATION_SCHEMA database. Use the SHOW PROCEDURE STATUS and SHOW FUNCTION ...