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https://dev.mysql.com/doc/refman/8.0/en/gis-data-formats.html
For example, a WKB value that corresponds to POINT(1 -1) consists of this sequence of 21 bytes, each represented by two hexadecimal digits: 0101000000000000000000F03F000000000000F0BF The sequence consists of the components shown in the following ...
https://dev.mysql.com/doc/refman/8.0/en/gis-linestring-property-functions.html
A unit is supported if it is found in the INFORMATION_SCHEMA ST_UNITS_OF_MEASURE table. You can extract particular points of a LineString, count the number of points that it contains, or obtain its length. Unless otherwise specified, functions in ...
https://dev.mysql.com/doc/refman/8.0/en/gone-away.html
If a specific query kills mysqld and the tables involved were checked with CHECK TABLE before you ran the query, can you provide a reproducible test case? See Section 7.9, “Debugging MySQL”. This section also covers the related Lost connection ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-change-primary.html
You can identify the current primary using the MEMBER_ROLE column in the Performance Schema table replication_group_members, or the group_replication_primary_member status variable. This section explains how to change which member of a ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-observability.html
The entire state of the system (including the view, conflict statistics and service states) can be queried through Performance Schema tables. For example, you can connect to a single server in the group and obtain both local and global information ... There is a lot of automation built into the Group Replication ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-exit.html
The group_replication_exit_state_action system variable, which is available from MySQL 8.0.12 and MySQL 5.7.24, specifies what Group Replication does when the member leaves the group unintentionally due to an error or problem, and either fails to ...
https://dev.mysql.com/doc/refman/8.0/en/ignoring-user.html
If you get the following error, it means that when mysqld was started or when it reloaded the grant tables, it found an account in the user table that had an invalid password. Found wrong password for user 'some_user'@'some_host'; ignoring user As ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool-flushing.html
When table data is stored on a traditional HDD storage device, flushing neighbor pages in one operation reduces I/O overhead (primarily for disk seek operations) compared to flushing individual pages at different times. For table data stored on SSD, ... InnoDB performs certain tasks in the background, including flushing of dirty pages from the buffer ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-configuration.html
For information about optimizing database operations for InnoDB tables, see Section 10.5, “Optimizing for InnoDB Tables”. This section provides configuration information and procedures for InnoDB initialization, startup, and various components ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-developing.html
Coming from a database background, you might be used to general-purpose SQL tables with many columns. The tables accessed by memcached code likely have only a few or even a single column holding data values. Typically, writing an application for ...