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https://dev.mysql.com/doc/refman/5.7/en/sys-schema.html
To upgrade in this case, remove or rename the existing sys schema first. Use of the dedicated mysql.sys account avoids problems that occur if a DBA renames or removes the root account. MySQL 5.7 includes the sys schema, a set of objects that helps ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-persistent-stats.html
If innodb_stats_auto_recalc is disabled, you can ensure the accuracy of optimizer statistics by executing the ANALYZE TABLE statement after making substantial changes to indexed columns. When an index is added to an existing table, or when a column ... The persistent optimizer statistics feature improves plan stability by storing statistics to disk and making them persistent across server restarts so that the optimizer is more likely to make consistent choices each time for a given ...
https://dev.mysql.com/doc/refman/5.7/en/explain-output.html
When all tables are processed, MySQL outputs the selected columns and backtracks through the table list until a table is found for which there are more matching rows. EXPLAIN Output Columns EXPLAIN Join Types EXPLAIN Extra Information EXPLAIN Output ... The EXPLAIN statement provides information about how MySQL executes ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-row-format.html
The B-tree index that represents an entire table is known as the clustered index, which is organized according to the primary key columns. The nodes of a clustered index data structure contain the values of all columns in the row. The nodes of a ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-conflict-resolution.html
Requirements Source Column Control Conflict Resolution Control Conflict Resolution Functions Conflict Resolution Exceptions Table Conflict Detection Status Variables Examples When using a replication setup involving multiple sources (including ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-differing-tables.html
A table on the source can have more or fewer columns than the replica's copy of the table. In addition, corresponding table columns on the source and the replica can use different data types, subject to certain conditions. (This is true even if both ... Source and target tables for replication do not have to be ...
https://dev.mysql.com/doc/refman/5.7/en/upgrading-from-previous-series.html
System Table Changes Incompatible change: The Password column of the mysql.user system table was removed in MySQL 5.7.6. All credentials are stored in the authentication_string column, including those formerly stored in the Password column. If ...
https://dev.mysql.com/doc/refman/5.7/en/grant-tables.html
Each grant table contains scope columns and privilege columns: Scope columns determine the scope of each row in the tables; that is, the context in which the row applies. Similarly, a db table row with Host, User, and Db column values of ... The ...
https://dev.mysql.com/doc/refman/5.7/en/converting-tables-to-innodb.html
File-per-table tablespaces also support the Barracuda file format and associated features such as table compression, efficient off-page storage for long variable-length columns, and large index prefixes. Create an empty InnoDB table with identical ... If you have MyISAM tables that you want to convert to InnoDB for better reliability and scalability, review the following guidelines and tips before ...
https://dev.mysql.com/doc/refman/5.7/en/mysqldump.html
--allow-keywords Command-Line Format --allow-keywords Permit creation of column names that are keywords. This works by prefixing each column name with the table name. --complete-insert, -c Command-Line Format --complete-insert Use complete INSERT ...