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https://dev.mysql.com/doc/refman/5.7/en/insert-optimization.html
To optimize insert speed, combine many small operations into a single large operation. Ideally, you make a single connection, send the data for many new rows at once, and delay all index updates and consistency checking until the very end. The size ...
https://dev.mysql.com/doc/refman/5.7/en/join.html
Such subqueries must include an alias to give the subquery result a table name. mysql> SELECT * FROM t1 NATURAL RIGHT JOIN t2; +------+------+------+ | a | c | b | +------+------+------+ | 2 | z | y | | 3 | w | NULL | +------+------+------+ Compare ... MySQL supports the following JOIN syntax for the table_references part of SELECT statements and multiple-table DELETE and UPDATE statements: table_references: escaped_table_reference [, escaped_table_reference] ...
https://dev.mysql.com/doc/refman/5.7/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Reserved words are permitted as ...
https://dev.mysql.com/doc/refman/5.7/en/kill.html
KILL [CONNECTION | QUERY] processlist_id Each connection to mysqld runs in a separate thread. Thread processlist identifiers can be determined from the ID column of the INFORMATION_SCHEMA PROCESSLIST table, the Id column of SHOW PROCESSLIST output, ...
https://dev.mysql.com/doc/refman/5.7/en/mrr-optimization.html
Reading rows using a range scan on a secondary index can result in many random disk accesses to the base table when the table is large and not stored in the storage engine's cache. With the Disk-Sweep Multi-Range Read (MRR) optimization, MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-key-caches.html
Where there are multiple key caches, the server must know which cache to use when processing queries for a given MyISAM table. Performance gains occur for other reasons as well: The hot cache is used only for retrieval queries, so its contents are ... Shared access to the key cache improves performance but does not eliminate contention among sessions ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndb-api-statistics.html
A number of types of statistical counters relating to actions performed by or affecting Ndb objects are available. Such actions include starting and closing (or aborting) transactions; primary key and unique key operations; table, range, and pruned ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-diskpagebuffer.html
The diskpagebuffer table provides statistics about disk page buffer usage by NDB Cluster Disk Data tables. The diskpagebuffer table contains the following columns: node_id The data node ID block_instance Block instance pages_written Number of pages ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-logging.html
The mysql client can do these types of logging for statements executed interactively: On Unix, mysql writes the statements to a history file. By default, this file is named .mysql_history in your home directory. To specify a different file, set the ...
https://dev.mysql.com/doc/refman/5.7/en/nested-loop-joins.html
MySQL executes joins between tables using a nested-loop algorithm or variations on it. Nested-Loop Join Algorithm Block Nested-Loop Join Algorithm Nested-Loop Join Algorithm A simple nested-loop join (NLJ) algorithm reads rows from the first table ...