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https://dev.mysql.com/doc/refman/8.0/en/show-triggers.html
row *************************** Trigger: ins_sum Event: INSERT Table: account Statement: SET @sum = @sum + NEW.amount Timing: BEFORE Created: 2018-08-08 10:10:12.61 sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES, NO_ZERO_IN_DATE,NO_ZERO_DATE, ...
https://dev.mysql.com/doc/refman/8.0/en/show.html
SHOW has many forms that provide information about databases, tables, columns, or status information about the server. The pattern is useful for restricting statement output to matching values. Several SHOW statements also accept a WHERE clause ...
https://dev.mysql.com/doc/refman/8.0/en/signal.html
Example: CREATE PROCEDURE p (divisor INT) BEGIN DECLARE divide_by_zero CONDITION FOR SQLSTATE '22012'; IF divisor = 0 THEN SIGNAL divide_by_zero; END IF; END; If the named condition does not exist in the scope of the SIGNAL statement, an Undefined ...SIGNAL provides error information to a handler, to an outer portion of the application, or to the ...
https://dev.mysql.com/doc/refman/8.0/en/source-configuration-options.html
-DSYSTEMD_PID_DIR=dir_name The name of the directory in which to create the PID file when MySQL is managed by systemd. -DREPRODUCIBLE_BUILD=bool For builds on Linux systems, this option controls whether to take extra care to create a build result ...
https://dev.mysql.com/doc/refman/8.0/en/symbolic-links-to-databases.html
On Unix, symlink a database using this procedure: Create the database using CREATE DATABASE: mysql> CREATE DATABASE mydb1; Using CREATE DATABASE creates the database in the MySQL data directory and permits the server to update the data dictionary ...Stop the server to ensure that no activity occurs in the new database while it is being ...
https://dev.mysql.com/doc/refman/8.0/en/temporary-files.html
For some statements, MySQL creates temporary SQL tables that are not hidden and have names that begin with #sql. Some SELECT queries creates temporary SQL tables to hold intermediate results. DDL operations that rebuild the table and are not ... On ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-unexpected-replica-halt.html
From MySQL 8.0, this repository is created by default as an InnoDB table named mysql.slave_relay_log_info. GTID auto-positioning means the replica can reliably identify and retrieve missing transactions, even if there are gaps in the sequence of ...
https://dev.mysql.com/doc/refman/8.0/en/backup-policy.html
Full backups are necessary, but it is not always convenient to create them. If you make sure to flush the logs when you make your full backup, the binary log files created afterward contain all the data changes made since the backup. On Monday at 1 ...A full backup (a snapshot of the data at a point in time) can be done in MySQL with several ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-utf16.html
For a supplementary character, utf16 has a special sequence for representing the character using 32 bits. The utf16 character set is the ucs2 character set with an extension that enables encoding of supplementary characters: For a BMP character, ...
https://dev.mysql.com/doc/refman/8.0/en/lock-tables.html
The table can be accessed freely by the session within which it was created, regardless of what other locking may be in effect. The following statements are prohibited while a LOCK TABLES statement is in effect: CREATE TABLE, CREATE TABLE ... LIKE, ... LOCK {TABLE | TABLES} tbl_name [[AS] alias] lock_type [, tbl_name [[AS] alias] lock_type] ...