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https://dev.mysql.com/doc/refman/8.0/en/concurrent-inserts.html
If there are multiple INSERT statements, they are queued and performed in sequence, concurrently with the SELECT statements. In addition, for those statements a read lock is placed on the selected-from table such that inserts into that table are ...
https://dev.mysql.com/doc/refman/8.0/en/engine-condition-pushdown-optimization.html
An example of such a query, using the table t1 created previously, is shown here: mysql> EXPLAIN -> SELECT * FROM t1 AS x -> LEFT JOIN t1 AS y -> ON x.a=0 AND y.b>=3\G *************************** 1. row *************************** id: 1 select_type: ... This optimization improves the efficiency of direct comparisons between a nonindexed column and a ...
https://dev.mysql.com/doc/refman/8.0/en/enum.html
This means that you can use the following SELECT statement to find rows into which invalid ENUM values were assigned: mysql> SELECT * FROM tbl_name WHERE enum_col=0; The index of the NULL value is NULL. For example, you can retrieve numeric values ... An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation ...
https://dev.mysql.com/doc/refman/8.0/en/forcing-innodb-recovery.html
To investigate database page corruption, you might dump your tables from the database with SELECT ... Serious corruption might cause SELECT * FROM tbl_name statements or InnoDB background operations to unexpectedly exit or assert, or even cause ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-search-mecab.html
SELECT COUNT(*) FROM articles WHERE MATCH(title,body) AGAINST('データベース管理' IN NATURAL LANGUAGE MODE); For boolean mode search, the search term is converted to a search phrase. SELECT COUNT(*) FROM articles WHERE MATCH(title,body) ...
https://dev.mysql.com/doc/refman/8.0/en/generated-column-index-optimizations.html
You can see this using EXPLAIN: mysql> EXPLAIN SELECT * FROM t1 WHERE f1 + 1 > 9\G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: t1 partitions: NULL type: range possible_keys: gc key: gc key_len: 5 ...For example: CREATE TABLE t1 (f1 INT, gc INT AS (f1 + 1) STORED, INDEX (gc)); The generated column, gc, is defined as the expression f1 + ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-consistency-guarantees.html
If there is none, a new one is selected from the list of secondary members. No read skew on read/write transactions, such as this one: > BEGIN; > SELECT x FROM t1; -- x=1 because x=2 is in the backlog; > INSERT x INTO t2; > COMMIT; This query should ... Although the Transaction Synchronization Points section explains that conceptually there are two synchronization points from which you can choose: on read or on write, these terms were a simplification and the terms used in Group Replication are: before and after transaction ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-enterprise-backup.html
MySQL Enterprise Backup is a commercially-licensed backup utility for MySQL Server, available with MySQL Enterprise Edition. This section explains how to back up and subsequently restore a Group Replication member using MySQL Enterprise Backup. The ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-system-variables.html
For details of how to select IP addresses and ports as distributed recovery endpoints, and how joining members use them, see Section 20.5.4.1.1, “Selecting addresses for distributed recovery endpoints”. Adding an interval avoids the selection of ... This section lists the system variables that are specific to the Group Replication ...
https://dev.mysql.com/doc/refman/8.0/en/identifiers.html
The identifier quote character is the backtick (`): mysql> SELECT * FROM `select` WHERE `select`.id > 100; If the ANSI_QUOTES SQL mode is enabled, it is also permissible to quote identifiers within double quotation marks: mysql> CREATE TABLE "test" ... Certain objects within MySQL, including database, table, index, column, alias, view, stored procedure, partition, tablespace, resource group and other object names are known as ...