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https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html
delay_key_write Command-Line Format --delay-key-write[={OFF|ON|ALL}] System Variable delay_key_write Scope Global Dynamic Yes SET_VAR Hint Applies No Type Enumeration Default Value ON Valid Values OFFONALL This variable specifies how to use delayed ... The MySQL server maintains many system variables that affect its ...
https://dev.mysql.com/doc/refman/8.0/en/create-table.html
(See Bug #32167.) DELAY_KEY_WRITE Set this to 1 if you want to delay key updates for the table until the table is closed. See the description of the delay_key_write system variable in Section 7.1.8, “Server System Variables”. | {FULLTEXT | ...
https://dev.mysql.com/doc/refman/8.0/en/external-locking.html
If you do use external locking option to enable updates to MyISAM tables from many MySQL processes, do not start the server with the delay_key_write system variable set to ALL or use the DELAY_KEY_WRITE=1 table option for any shared tables.
https://dev.mysql.com/doc/refman/8.0/en/myisam-start.html
Note This is a limit per thread! delay_key_write=ALL Don't flush key buffers between writes for any MyISAM table. The following options to mysqld can be used to change the behavior of MyISAM tables. bulk_insert_buffer_size The size of the tree ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-queries-myisam.html
Declaring a MyISAM table with the DELAY_KEY_WRITE=1 table option makes index updates faster because they are not flushed to disk until the table is closed. (However, even in this case, you should not lose anything by using DELAY_KEY_WRITE, because ... Some general tips for speeding up queries on MyISAM tables: To help MySQL better optimize queries, use ANALYZE TABLE or run myisamchk --analyze on a table after it has been loaded with ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table.html
ALTER TABLE tbl_name [alter_option [, alter_option] ...] [partition_options] alter_option: { table_options | ADD [COLUMN] col_name column_definition [FIRST | AFTER col_name] | ADD [COLUMN] (col_name column_definition,...) | ADD {INDEX | KEY} ...
https://dev.mysql.com/doc/refman/8.0/en/crashing.html
(This is not true if you are running with the delay_key_write system variable enabled, in which case data files are written but not index files.) This means that data file contents are safe even if mysqld crashes, because the operating system ...
https://dev.mysql.com/doc/refman/8.0/en/dynamic-system-variables.html
Many server system variables are dynamic and can be set at runtime. For a description of the privilege requirements for setting system variables, see Section 7.1.9.1, “System Variable Privileges” The following table lists all dynamic system ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-replication.html
You can also start the replicas with the --skip-innodb option, enable the low_priority_updates system variable, and set the delay_key_write system variable to ALL to get speed improvements on the replica end. In the following section, we provide ...
https://dev.mysql.com/doc/refman/8.0/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. Some keywords which are otherwise ...