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https://dev.mysql.com/doc/refman/5.7/en/select.html
[WITH ROLLUP]] [HAVING where_condition] [ORDER BY {col_name | expr | position} [ASC | DESC], ...] [LIMIT {[offset,] row_count | row_count OFFSET offset}] [PROCEDURE procedure_name(argument_list)] [into_option] [FOR UPDATE | LOCK IN SHARE MODE] ...
https://dev.mysql.com/doc/refman/5.7/en/innochecksum.html
On Windows systems, innochecksum must be run separately for each user-defined tablespace file. innochecksum --allow-mismatches=1 --write innodb ../data/test/tab1.ibd With --allow-mismatches set to 1, if there is a mismatch at page 600 and another at ...This tool reads an InnoDB tablespace file, calculates the checksum for each page, compares the calculated checksum to the stored checksum, and reports mismatches, which indicate damaged ...
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-tuning.html
If the application has high requirements for the response time, it should most likely throttle users at a higher level itself. This section provides guidelines on setting thread pool system variables for best performance, measured using a metric ...
https://dev.mysql.com/doc/refman/5.7/en/switchable-optimizations.html
For batched_key_access to have any effect when set to on, the mrr flag must also be on. The derived_merge flag controls whether the optimizer attempts to merge derived tables and view references into the outer query block, assuming that no other ...
https://dev.mysql.com/doc/refman/5.7/en/replace.html
Any missing columns are set to their default values, just as happens for INSERT. There are no user-visible effects other than a possible difference in how the storage engine increments Handler_xxx status variables. REPLACE [LOW_PRIORITY | DELAYED] ... REPLACE [LOW_PRIORITY | DELAYED] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] {VALUES | VALUE} (value_list) [, (value_list)] ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statement-performance-analyzer.html
Configuration Options statement_performance_analyzer() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 26.4.2.1, “The sys_config Table”): debug, @sys.debug If this ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-types.html
For HASH partitioning, the user-supplied expression must evaluate to an integer value. With this type of partitioning, a partition is selected based on the value returned by a user-defined expression that operates on column values in rows to be ...
https://dev.mysql.com/doc/refman/5.7/en/flush.html
Reloading the grant tables is necessary to enable updates to MySQL privileges and users only if you make such changes directly to the grant tables; it is not needed for account management statements such as GRANT or REVOKE, which take effect ...See ...FOR EXPORT } table_synonym: { TABLE | TABLES } The FLUSH statement has several variant forms that clear or reload various internal caches, flush tables, or acquire ...
https://dev.mysql.com/doc/refman/5.7/en/storage-engines.html
For advanced users, this chapter also contains a description of the pluggable storage engine architecture (see Section 15.11, “Overview of MySQL Storage Engine Architecture”). InnoDB is a transaction-safe (ACID compliant) storage engine for ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create-server.html
For reference, the format of the CONNECTION string is as follows: scheme://user_name[:password]@host_name[:port_num]/db_name/tbl_name Description CONNECTION string CREATE SERVER option mysql.servers column Connection scheme scheme wrapper_name ...