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https://dev.mysql.com/doc/refman/5.7/en/collation-diagnostics.html
The MySQL server generates diagnostics when it finds problems while parsing the Index.xml file: Unknown tags are written to the error log. For example, the following message results if a collation definition contains a <aaa> tag: [Warning] Buffered ...In other cases, when a collation description is generally correct but contains some unknown tags, the collation is initialized and is available for ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-buffer-pool-optimization.html
InnoDB maintains a storage area called the buffer pool for caching data and indexes in memory. Knowing how the InnoDB buffer pool works, and taking advantage of it to keep frequently accessed data in memory, is an important aspect of MySQL tuning.
https://dev.mysql.com/doc/refman/5.7/en/macos-installation.html
For a list of macOS versions that the MySQL server supports, see https://www.mysql.com/support/supportedplatforms/database.html. MySQL for macOS is available in a number of different forms: Native Package Installer, which uses the native macOS ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-type-overview.html
MySQL has spatial data types that correspond to OpenGIS classes. The basis for these types is described in Section 11.4.2, “The OpenGIS Geometry Model”. Some spatial data types hold single geometry values: GEOMETRY POINT LINESTRING POLYGON ...
https://dev.mysql.com/doc/refman/5.7/en/replication-bugs.html
When you have determined that there is no user error involved, and replication still either does not work at all or is unstable, it is time to send us a bug report. Please spend some time and effort in preparing a good bug report. If you have a ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-file-io.html
io_latency The total wait time of timed file I/O events for the host. By default, rows are sorted by descending total file I/O latency. The host_summary_by_file_io and x$host_summary_by_file_io views have these columns: host The host from which the ...
https://dev.mysql.com/doc/refman/5.7/en/sys-user-summary-by-file-io.html
io_latency The total wait time of timed file I/O events for the user. By default, rows are sorted by descending total file I/O latency. The user_summary_by_file_io and x$user_summary_by_file_io views have these columns: user The client user name.
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-transactions.html
INNODB_LOCKS: Each transaction in InnoDB that is waiting for another transaction to release a lock (INNODB_TRX.TRX_STATE is LOCK WAIT) is blocked by exactly one blocking lock request. That blocking lock request is for a row or table lock held by ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-descriptions.html
Tables in the performance_schema database can be grouped as follows: Setup tables. The events_waits_current table contains the most recent event for each thread. Other similar tables contain current events at different levels of the event ...
https://dev.mysql.com/doc/refman/5.7/en/delete-optimization.html
The time required to delete individual rows in a MyISAM table is exactly proportional to the number of indexes. Truncate operations are not transaction-safe; an error occurs when attempting one in the course of an active transaction or active table ...To delete rows more quickly, you can increase the size of the key cache by increasing the key_buffer_size system ...