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https://dev.mysql.com/doc/refman/9.7/en/innodb-performance-thread_concurrency.html
InnoDB uses operating system threads to process requests from user transactions. (Transactions may issue many requests to InnoDB before they commit or roll back.) On modern operating systems and servers with multi-core processors, where context ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-preload-buffer-pool.html
To reduce the warmup period after restarting the server, InnoDB saves a percentage of the most recently used pages for each buffer pool at server shutdown and restores these pages at server startup. The percentage of recently used pages that is ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-tablespace-autoextend-size.html
By default, when a file-per-table or general tablespace requires additional space, the tablespace is extended incrementally according to the following rules: If the tablespace is less than an extent in size, it is extended one page at a time. If ...
https://dev.mysql.com/doc/refman/9.7/en/insert.html
INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] { {VALUES | VALUE} (value_list) [, (value_list)] ... | TABLE table_name | VALUES ...
https://dev.mysql.com/doc/refman/9.7/en/jdv-concurrency.html
DML operations for JSON duality views support lockless optimistic concurrency control (LOCC). The use of LOCC safeguards against conflicts and data inconsistencies for concurrent operations. This is especially important for read and write ...
https://dev.mysql.com/doc/refman/9.7/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/9.7/en/linux-installation-apt-repo.html
This section provides guidance on installing MySQL using the MySQL APT repository. First, add the MySQL APT repository to your system's software repository list. Follow these steps: Go to the download page for the MySQL APT repository at ...
https://dev.mysql.com/doc/refman/9.7/en/mathematical-functions.html
ABS(X) Returns the absolute value of X, or NULL if X is NULL. An implication of this is that ABS(-9223372036854775808) produces an error because the result cannot be stored in a signed BIGINT value. mysql> SELECT ABS(2); -> 2 mysql> SELECT ABS(-32); ...
https://dev.mysql.com/doc/refman/9.7/en/memory-storage-engine.html
The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in memory. Because the data is vulnerable to crashes, hardware issues, or power outages, only use these tables as temporary work areas ...
https://dev.mysql.com/doc/refman/9.7/en/mle-component-status.html
The MLE component's status is indicated by the mle_status status variable. This remains Inactive until a user creates or invokes a stored procedure or function using a language supported by MLE, at which time it becomes (very briefly) Initializing ...