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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-runtime-configuration.html
If you have the UPDATE privilege, you can change Performance Schema operation by modifying setup tables to affect how monitoring occurs. For additional details about these tables, see Section 29.12.2, “Performance Schema Setup Tables”. The ...
https://dev.mysql.com/doc/refman/8.0/en/replication-multi-source-monitoring.html
To monitor the status of replication channels the following options exist: Using the replication Performance Schema tables. The information that was available through these variables has been migrated to the replication performance tables. This ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-progress-reporting.html
The following sys schema views provide progress reporting for long-running transactions: processlist session x$processlist x$session Assuming that the required instruments and consumers are enabled, the progress column of these views shows the ...
https://dev.mysql.com/doc/refman/8.0/en/using-explain.html
That is, MySQL explains how it would process the statement, including information about how tables are joined and in which order. With the help of EXPLAIN, you can see where you should add indexes to tables so that the statement executes faster by ... The EXPLAIN statement provides information about how MySQL executes statements: EXPLAIN works with SELECT, DELETE, INSERT, REPLACE, and UPDATE ...
https://dev.mysql.com/doc/refman/8.0/en/using-log-files.html
Note that before starting mysqld with the general query log enabled, you should check all your tables with myisamchk. If this happens, you should check all your tables with myisamchk (see Chapter 7, MySQL Server Administration), and test the ...If ...
https://dev.mysql.com/doc/refman/8.0/en/full-disk.html
Exceptions to the preceding behavior are when you use REPAIR TABLE or OPTIMIZE TABLE or when the indexes are created in a batch after LOAD DATA or after an ALTER TABLE statement. Other threads might be waiting for the table that caused the disk-full ... This section describes how MySQL responds to disk-full errors (such as “no space left on device”), and to quota-exceeded errors (such as “write failed” or “user block limit ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-restrictions-limitations.html
You cannot create a table with a column name that matches the name of an internal InnoDB column (including DB_ROW_ID, DB_TRX_ID, and DB_ROLL_PTR. mysql> CREATE TABLE t1 (c1 INT, db_row_id INT) ENGINE=INNODB; ERROR 1166 (42000): Incorrect column name ...InnoDB does not keep an internal count of rows in a table because concurrent transactions might “see” different numbers of rows at the same ...
https://dev.mysql.com/doc/refman/8.0/en/set-variable.html
User-Defined Variable Assignment Parameter and Local Variable Assignment System Variable Assignment SET Error Handling Multiple Variable Assignment System Variable References in Expressions User-Defined Variable Assignment User-defined variables are ...variable: { user_var_name | param_name | local_var_name | {GLOBAL | @@GLOBAL.} system_var_name | {PERSIST | @@PERSIST.} system_var_name | {PERSIST_ONLY | @@PERSIST_ONLY.} system_var_name | [SESSION | ...
https://dev.mysql.com/doc/refman/8.0/en/show-warnings.html
Warnings are generated for DML statements such as INSERT, UPDATE, and LOAD DATA as well as DDL statements such as CREATE TABLE and ALTER TABLE. mysql> CREATE TABLE t1 (a TINYINT NOT NULL, b CHAR(4)); Query OK, 0 rows affected (0.05 sec) mysql> ...
https://dev.mysql.com/doc/refman/8.0/en/replication-howto-additionalslaves.html
InnoDB tablespace files and file-per-table tablespaces might have been created in other directories. Note If the replication source server or existing replica that you are copying to create the new replica has any scheduled events, ensure that these ... You can add another replica to an existing replication configuration without stopping the source ...