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https://dev.mysql.com/doc/refman/5.7/en/data-type-defaults.html
For nontransactional tables, an error occurs, but if this happens for the second or subsequent row of a multiple-row statement, any rows preceding the error have already been inserted. The exception is that, for TIMESTAMP and DATETIME columns, you ... Data type specifications can have explicit or implicit default ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmpmem-table.html
RELOCATION_TIME The total time in microseconds used for relocating blocks of size PAGE_SIZE. RELOCATION_OPS The number of times a block of size PAGE_SIZE has been relocated. row *************************** page_size: 1024 buffer_pool_instance: 0 ...
https://dev.mysql.com/doc/refman/5.7/en/sys-io-global-by-file-by-latency.html
These views summarize global I/O consumers to display time waiting for I/O, grouped by file. total_latency The total wait time of timed I/O events for the file. read_latency The total wait time of timed read I/O events for the file. write_latency ...The io_global_by_file_by_latency and x$io_global_by_file_by_latency views have these columns: file The file path ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-performance-timers-table.html
The rows that do not contain NULL indicate which timers you can use in setup_timers. Note As of MySQL 5.7.21, the Performance Schema setup_timers table is deprecated and is removed in MySQL 8.0, as is the TICKS row in the performance_timers table.
https://dev.mysql.com/doc/refman/5.7/en/mysqlpump.html
mysqlpump Invocation Syntax mysqlpump Option Summary mysqlpump Option Descriptions mysqlpump Object Selection mysqlpump Parallel Processing mysqlpump Restrictions The mysqlpump client utility performs logical backups, producing a set of SQL ...It ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-online-ddl-limitations.html
When the DML operations are applied, it is possible to encounter a duplicate key entry error (ERROR 1062 (23000): Duplicate entry), even if the duplicate entry is only temporary and would be reverted by a later entry in the online log. An online DDL ... The following limitations apply to online DDL operations: The table is copied when creating an index on a TEMPORARY ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-column-indexes.html
MySQL can create composite indexes (that is, indexes on multiple columns). For certain data types, you can index a prefix of the column (see Section 8.3.4, “Column Indexes”). MySQL can use multiple-column indexes for queries that test all the ...
https://dev.mysql.com/doc/refman/5.7/en/replication-solutions-backups-read-only.html
Note The instructions in this section place the server to be backed up in a state that is safe for backup methods that get the data from the server, such as mysqldump (see Section 4.5.4, “mysqldump — A Database Backup Program”). You should not ...
https://dev.mysql.com/doc/refman/5.7/en/replication-solutions-performance.html
This prevents “dumb” replicas from also logging events they have executed into their own binary log. As the number of replicas connecting to a source increases, the load, although minimal, also increases, as each replica uses a client ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-introduction.html
InnoDB is a general-purpose storage engine that balances high reliability and high performance. Unless you have configured a different default storage engine, issuing a CREATE TABLE statement without an ENGINE clause creates an InnoDB table. Key ...