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https://dev.mysql.com/doc/refman/5.7/en/adding-collation-simple-8bit.html
This section describes how to add a simple collation for an 8-bit character set by writing the <collation> elements associated with a <charset> character set description in the MySQL Index.xml file. The example adds a collation named latin1_test_ci ...
https://dev.mysql.com/doc/refman/5.7/en/old-native-pluggable-authentication.html
MySQL includes two plugins that implement native authentication; that is, authentication based on the password hashing methods in use from before the introduction of pluggable authentication. This section describes mysql_old_password, which ...
https://dev.mysql.com/doc/refman/5.7/en/replication-sbr-rbr.html
If there is an error in evaluation on the replica, particularly when executing complex statements, statement-based replication may slowly increase the margin of error across the affected rows over time. For complex statements, the statement must be ...For most users, the mixed replication format should provide the best combination of data integrity and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-multiple-buffer-pools.html
To enable multiple buffer pool instances, set the innodb_buffer_pool_instances configuration option to a value greater than 1 (the default) up to 64 (the maximum). For systems with buffer pools in the multi-gigabyte range, dividing the buffer pool ...
https://dev.mysql.com/doc/refman/5.7/en/insert-delayed.html
The DELAYED option for the INSERT statement is a MySQL extension to standard SQL. The server recognizes but ignores the DELAYED keyword, handles the insert as a nondelayed insert, and generates an ER_WARN_LEGACY_SYNTAX_CONVERTED warning: INSERT ...
https://dev.mysql.com/doc/refman/5.7/en/populating-spatial-columns.html
After you have created spatial columns, you can populate them with spatial data. Values should be stored in internal geometry format, but you can convert them to that format from either Well-Known Text (WKT) or Well-Known Binary (WKB) format. For ...
https://dev.mysql.com/doc/refman/5.7/en/sys-sys-get-config.html
Given a configuration option name, returns the option value from the sys_config table, or the provided default value (which may be NULL) if the option does not exist in the table. If sys_get_config() returns the default value and that value is ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-examples-compression-sect.html
Compressing or uncompressing pages has consumed less than a second since the time the statistics were reset, because the columns COMPRESS_TIME and UNCOMPRESS_TIME are zero. This copying of SUM(PAGE_SIZE*RELOCATION_OPS) bytes has consumed less than a ... Example 14.1 Using the Compression Information Schema Tables The following is sample output from a database that contains compressed tables (see Section 14.9, “InnoDB Table and Page Compression”, INNODB_CMP, INNODB_CMP_PER_INDEX, and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-index-types.html
How Secondary Indexes Relate to the Clustered Index Indexes other than the clustered index are known as secondary indexes. In InnoDB, each record in a secondary index contains the primary key columns for the row, as well as the columns specified for ... Each InnoDB table has a special index called the clustered index that stores row ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-atom-molecule-events.html
For example, a row fetch might result in rows like this: Row# EVENT_NAME TIMER_START TIMER_END ---- ---------- ----------- --------- 1 wait/io/file/myisam/dfile 10001 10002 2 wait/io/table/sql/handler 10000 NULL The row fetch causes a file read. In ... For a table I/O event, there are usually two rows in events_waits_current, not ...