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Rechercher dans le manuel MySQL
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https://dev.mysql.com/innodb-transaction-isolation-levels.html
For other search conditions, InnoDB locks the index range scanned, using gap locks or next-key locks to block insertions by other sessions into the gaps covered by the range. Gap locking is only used for foreign-key constraint checking and ...
https://dev.mysql.com/invisible-indexes.html
If an index made invisible actually is needed or used by the optimizer, there are several ways to notice the effect of its absence on queries for the table: Errors occur for queries that include index hints that refer to the invisible index. If the ... MySQL supports invisible indexes; that is, indexes that are not used by the ...
https://dev.mysql.com/memory-storage-engine.html
Shared-nothing architecture and multiple-host operation with no single point of failure, enabling 99.999% availability. Deleted rows are put in a linked list and are reused when you insert new data into the table. CREATE TABLE t (i INT) ENGINE = ...
https://dev.mysql.com/mysqlbinlog-row-events.html
# at 218 #080828 15:03:08 server id 1 end_log_pos 258 Write_rows: table id 17 flags: STMT_END_F BINLOG ' fAS3SBMBAAAALAAAANoAAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ= fAS3SBcBAAAAKAAAAAIBAAAQABEAAAAAAAEAA//8AQAAAAVhcHBsZQ== '/*!*/; ### INSERT INTO ...
https://dev.mysql.com/show-create-table.html
row *************************** Table: t Create Table: CREATE TABLE `t` ( `id` int(11) NOT NULL AUTO_INCREMENT, `s` char(60) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 As of MySQL 8.0.16, MySQL implements CHECK ... SHOW ...
https://dev.mysql.com/control-flow-functions.html
Otherwise, the result is an integer type (with one exception): If all integer types are all signed or all unsigned, the result is the same sign and the precision is the highest of all specified integer types (that is, TINYINT, SMALLINT, MEDIUMINT, ...The second syntax returns the result for the first condition that is ...
https://dev.mysql.com/create-index.html
However, prefix lengths for index specifications in CREATE TABLE, ALTER TABLE, and CREATE INDEX statements are interpreted as number of characters for nonbinary string types (CHAR, VARCHAR, TEXT) and number of bytes for binary string types (BINARY, ... CREATE [UNIQUE | FULLTEXT | SPATIAL] INDEX index_name [index_type] ON tbl_name (key_part,...) [index_option] [algorithm_option | lock_option] ...
https://dev.mysql.com/declare-handler.html
It can take the following forms: mysql_error_code: An integer literal indicating a MySQL error code, such as 1051 to specify “unknown table”: DECLARE CONTINUE HANDLER FOR 1051 BEGIN -- body of handler END; Do not use MySQL error code 0 because ...statement handler_action: { CONTINUE | EXIT | UNDO } condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value | condition_name | SQLWARNING | NOT FOUND | SQLEXCEPTION } The DECLARE ...
https://dev.mysql.com/if.html
[ELSE statement_list] END IF The IF statement for stored programs implements a basic conditional construct. Note There is also an IF() function, which differs from the IF statement described here. The IF statement can have THEN, ELSE, and ELSEIF ...
https://dev.mysql.com/innodb-and-mysql-replication.html
MySQL replication works for InnoDB tables as it does for MyISAM tables. It is also possible to use replication in a way where the storage engine on the slave is not the same as the original storage engine on the master. For example, you can ...
Document created the 26/06/2006, last modified the 26/10/2018
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