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https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html
When you add a primary key using the ALGORITHM=COPY clause, MySQL converts NULL values in the associated columns to default values: 0 for numbers, an empty string for character-based columns and BLOBs, and 0000-00-00 00:00:00 for DATETIME. A newly ... Online support details, syntax examples, and usage notes for DDL operations are provided under the following topics in this ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-secure-user.html
Alternatively, from MySQL 8.0.21, you can specify them on the START GROUP_REPLICATION statement each time Group Replication is started. If group members have been set up to support the use of a remote cloning operation as part of distributed ...
https://dev.mysql.com/doc/refman/8.0/en/user-variables.html
Beginning with MySQL 8.0.22, a reference to a user variable in a prepared statement has its type determined when the statement is first prepared, and retains this type each time the statement is executed thereafter. "</p>\n"; } $result->close(); ...
https://dev.mysql.com/doc/refman/8.0/en/query-attributes.html
As of MySQL 8.0.23, clients can also define query attributes that apply to the next statement sent to the server for execution: Attributes are defined prior to sending the statement. MySQL supports these capabilities without the use of workarounds ... The most visible part of an SQL statement is the text of the ...
https://dev.mysql.com/doc/refman/8.0/en/charset-collation-implementations.html
MySQL implements several types of collations: Simple collations for 8-bit character sets This kind of collation is implemented using an array of 256 weights that defines a one-to-one mapping from character codes to weights. mysql> SET NAMES ...It ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-files-table.html
mysql> SELECT FILE_ID, FILE_NAME, FILE_TYPE, TABLESPACE_NAME, FREE_EXTENTS, TOTAL_EXTENTS, EXTENT_SIZE, INITIAL_SIZE, MAXIMUM_SIZE, AUTOEXTEND_SIZE, DATA_FREE, STATUS ENGINE FROM INFORMATION_SCHEMA.FILES WHERE TABLESPACE_NAME LIKE 'innodb_system' \G ... The Information Schema FILES table provides metadata about all InnoDB tablespace types including file-per-table tablespaces, general tablespaces, the system tablespace, temporary table tablespaces, and undo tablespaces (if ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-fulltext_index-tables.html
Because the contents of INNODB_FT_BEING_DELETED typically have a short lifetime, this table has limited utility for monitoring or debugging. For information about running OPTIMIZE TABLE on tables with FULLTEXT indexes, see Section 14.9.6, ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-system-tables.html
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_COLUMNS where TABLE_ID = 71\G *************************** 1. mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_INDEXES WHERE TABLE_ID = 71 \G *************************** 1. mysql> SELECT * FROM ... You can ...
https://dev.mysql.com/doc/refman/8.0/en/introduction.html
The MySQL software delivers a very fast, multithreaded, multi-user, and robust SQL (Structured Query Language) database server. MySQL Server is intended for mission-critical, heavy-load production systems as well as for embedding into mass-deployed ...Oracle is a registered trademark of Oracle Corporation and/or its ...
https://dev.mysql.com/doc/refman/8.0/en/secure-client-programming.html
Thus, MySQL errors must sometimes necessarily contain references to the names of those objects. Client applications that access MySQL should use the following guidelines to avoid interpreting external data incorrectly or exposing sensitive ...This ...