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https://dev.mysql.com/doc/refman/8.0/en/cursors.html
Cursors have these properties: Asensitive: The server may or may not make a copy of its result table Read only: Not updatable Nonscrollable: Can be traversed only in one direction and cannot skip rows Cursor declarations must appear before handler ...
https://dev.mysql.com/doc/refman/8.0/en/declare-local-variable.html
The value can be specified as an expression; it need not be a constant. If the DEFAULT clause is missing, the initial value is NULL. Local variables are treated like stored routine parameters with respect to data type and overflow checking. type ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-upgrade-with-mysqlbackup.html
As part of a provisioning approach you can use MySQL Enterprise Backup to copy and restore the data from a group member to new members. Deploy a new server instance, which must be running the same version of MySQL as the older member where the ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-windows-servers.html
The following sections describe how to start each server with different values for those options that must be unique per server, such as the data directory. You can run multiple servers on Windows by starting them manually from the command line, ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-other-options.html
If keys are packed (PACK_KEYS=1), myisamchk must unpack key blocks first, then re-create indexes and pack the key blocks again. myisamchk supports the following options for actions other than table checks and repairs: --analyze, -a Command-Line ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-optimization.html
It reduces at an early stage of query execution the amount of data retrieved. Applications that monitor databases may make frequent use of Performance Schema tables. To write queries for these tables most efficiently, take advantage of their ...For ...
https://dev.mysql.com/doc/refman/8.0/en/timestamp-lookups.html
In the preceding discussion, the data set stored in tstable happens to consist of distinct UTC values. Temporal values are stored in TIMESTAMP columns as UTC values, and values inserted into and retrieved from TIMESTAMP columns are converted ...
https://dev.mysql.com/doc/refman/8.0/en/displaying-traces.html
INTO DUMPFILE is preferable to INTO OUTFILE for this purpose, since the latter escapes newlines. Examining a trace in the mysql command-line client can be made less difficult using the pager less command (or your operating platform's equivalent).
https://dev.mysql.com/doc/refman/8.0/en/key-cache-restructuring.html
Instead, the server directly accesses the table indexes using native file system caching. After the cache has been restructured, it becomes available again for caching indexes assigned to it, and the use of file system caching for the indexes ceases. For example: mysql> SET GLOBAL cold_cache.key_buffer_size=4*1024*1024; If you assign to either the key_buffer_size or key_cache_block_size key cache component a value that differs from the component's current value, the server destroys the cache's old structure and creates a new one based on the new ...
https://dev.mysql.com/doc/refman/8.0/en/mysql.html
You can execute SQL statements in a script file (batch file) like this: mysql db_name < script.sql > output.tab On Unix, the mysql client logs statements executed interactively to a history file. When used noninteractively (for example, as a ...