https://dev.mysql.com/server-system-variables.html
delay_key_write Property Value 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 ONOFFALL This variable specifies how ... The MySQL server maintains many system variables that configure its ...
https://dev.mysql.com/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 5.1.8, “Server System Variables”. CREATE [TEMPORARY] ...
https://dev.mysql.com/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/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/using-system-variables.html
For example, on the command line, --delay_key_write=1 works but --delay_key_write=ON does not. The MySQL server maintains many system variables that configure its operation. Section 5.1.8, “Server System Variables”, describes the meaning of ...
https://dev.mysql.com/myisam-start.html
The following options to mysqld can be used to change the behavior of MyISAM tables. --delay-key-write=ALL Don't flush key buffers between writes for any MyISAM table. Note If you do this, you should not access MyISAM tables from another program ...
https://dev.mysql.com/faqs-replication.html
You can also start the slaves with the --skip-innodb and --low-priority-updates options, and set the delay_key_write system variable to ALL to get speed improvements on the slave end. In the following section, we provide answers to questions that ...
https://dev.mysql.com/server-option-variable-reference.html
The following table lists all command-line options, system variables, and status variables applicable within mysqld. The table lists command-line options (Cmd-line), options valid in configuration files (Option file), server system variables ...
https://dev.mysql.com/server-system-variable-reference.html
The following table lists all system variables applicable within mysqld. The table lists command-line options (Cmd-line), options valid in configuration files (Option file), server system variables (System Var), and status variables (Status var) in ...
https://dev.mysql.com/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 ...
