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https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-porting-mysql.html
If there is a short numeric primary key column in an InnoDB table, use it as the unique lookup key for memcached by converting the integer to a string value. If the memcached server is used for multiple applications, or with more than one InnoDB ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-waits-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored wait event, so there is no system variable for configuring the table size. Of the tables that contain wait event rows, events_waits_current is the ...The THREAD_ID and EVENT_ID values taken together uniquely identify the ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-limitations-partitioning-keys-unique-keys.html
These rules also apply to existing nonpartitioned tables that you wish to partition using ALTER TABLE ... The rule governing this relationship can be expressed as follows: All columns used in the partitioning expression for a partitioned table must ... This section discusses the relationship of partitioning keys with primary keys and unique ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-option-tables.html
ndb-allow-copying-alter-table: Set to OFF to keep ALTER TABLE from using copying operations on NDB tables. ndb_read_backup: Enable read from any replica for all NDB tables; use NDB_TABLE=READ_BACKUP={0|1} with CREATE TABLE or ALTER TABLE to enable ...ndb-default-column-format: Use this value (FIXED or DYNAMIC) by default for COLUMN_FORMAT and ROW_FORMAT options when creating or adding table ... The following list ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-compression-usage.html
After the innodb_file_per_table and innodb_file_format options are configured, specify the ROW_FORMAT=COMPRESSED clause or KEY_BLOCK_SIZE clause, or both, in a CREATE TABLE or ALTER TABLE statement to create a compressed table in a file-per-table ...
https://dev.mysql.com/doc/refman/5.7/en/table-locking.html
InnoDB tables use row-level locking so that multiple sessions and applications can read from and write to the same table simultaneously, without making each other wait or producing inconsistent results. For this storage engine, avoid using the LOCK ...See Chapter 14, The InnoDB Storage Engine for more details about this storage ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-6.html
New features and other important changes in NDB Cluster 7.6 which are likely to be of interest are shown in the following list: New Disk Data table file format. A new file format is used in NDB 7.6 for NDB Disk Data tables, which makes it possible ...You can do this by performing an initial restart of each data node (that is, using the --initial option) as part of the upgrade ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-handles-table.html
The Performance Schema exposes table lock information through the table_handles table to show the table locks currently in effect for each opened table handle. This information shows which table handles the server has open, how they are locked, and ...The value is one of READ, READ WITH SHARED LOCKS, READ HIGH PRIORITY, READ NO INSERT, WRITE ALLOW WRITE, WRITE CONCURRENT INSERT, WRITE LOW PRIORITY, or ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-select.html
You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * FROM orig_tbl; MySQL creates new columns for all elements in the SELECT. For example: mysql> CREATE ...
https://dev.mysql.com/doc/refman/5.7/en/derived-table-optimization.html
The optimizer handles derived tables and view references the same way: It avoids unnecessary materialization whenever possible, which enables pushing down conditions from the outer query to derived tables and produces more efficient execution plans.