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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 ...This process is repeated as many times as there remain tables to be ...
https://dev.mysql.com/doc/refman/5.7/en/loop.html
[begin_label:] LOOP statement_list END LOOP [end_label] LOOP implements a simple loop construct, enabling repeated execution of the statement list, which consists of one or more statements, each terminated by a semicolon (;) statement delimiter.
https://dev.mysql.com/doc/refman/5.7/en/bnl-bka-optimization.html
Also, the Block Nested-Loop (BNL) Join algorithm previously used only for inner joins is extended and can be employed for outer join and semijoin operations, including nested outer joins. The block_nested_loop and batched_key_access flags of the ...
https://dev.mysql.com/doc/refman/5.7/en/nested-join-optimization.html
More exactly, a variation of the nested-loop join algorithm is exploited. Recall the algorithm by which the nested-loop join executes a query (see Section 8.2.1.6, “Nested-Loop Join Algorithms”). If at the end of the loop cycle the flag is still ...The following discussion refers to the join syntax described in Section 13.2.9.2, “JOIN ...
https://dev.mysql.com/doc/refman/5.7/en/dbug-package.html
In MySQL, common debug macro keywords to enable are enter, exit, error, warning, info, and loop. The MySQL server and most MySQL clients are compiled with the DBUG package originally created by Fred Fish. When you have configured MySQL for ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndbinfo-select-all.html
--delay=seconds Command-Line Format --delay=# Type Numeric Default Value 5 Minimum Value 0 Maximum Value MAX_INT This option sets the number of seconds to wait between executing loops. Has no effect if --loops is set to 0 or 1. --loops=number, -l ...
https://dev.mysql.com/doc/refman/5.7/en/statement-labels.html
[begin_label:] BEGIN [statement_list] END [end_label] [begin_label:] LOOP statement_list END LOOP [end_label] [begin_label:] REPEAT statement_list UNTIL search_condition END REPEAT [end_label] [begin_label:] WHILE search_condition DO statement_list ...Label use for those statements follows these rules: begin_label must be followed by a ...
https://dev.mysql.com/doc/refman/5.7/en/explain-output.html
Using join buffer (Block Nested Loop), Using join buffer (Batched Key Access) (JSON property: using_join_buffer) Tables from earlier joins are read in portions into the join buffer, and then their rows are used from the buffer to perform the join ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-spin_lock_polling.html
The duration of a spin-wait loop is determined by the number of PAUSE instructions that occur in the loop. The duration of the delay loop depends on the C compiler and the target processor. On a system where all processor cores share a fast cache ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-log-statistics.html
This scheduler runs in an infinite loop; during each loop the scheduler performs the following tasks: Read any incoming messages from sockets into a job buffer. This is the number of loops executed in the third step from the preceding list. The NDB ...