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https://dev.mysql.com/doc/refman/8.4/en/innodb-information-schema-files-table.html
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 present). For more ...
https://dev.mysql.com/doc/refman/8.4/en/myisam-optimization.html
To coalesce fragmented rows and eliminate wasted space that results from deleting or updating rows, run myisamchk in recovery mode: $> myisamchk -r tbl_name You can optimize a table in the same way by using the OPTIMIZE TABLE SQL statement.
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-programs-ndbinfo-select-all.html
ndbinfo_select_all is a client program that selects all rows and columns from one or more tables in the ndbinfo database Not all ndbinfo tables available in the mysql client can be read by this program (see later in this section). In addition, ...
https://dev.mysql.com/doc/refman/8.4/en/replication-features-create-select.html
If the destination table does not exist, logging occurs as follows. ROW format: The statement is logged as a CREATE TABLE statement followed by a series of insert-row events. This includes the case that the destination table exists and IF NOT EXISTS ...SELECT always performs an implicit commit (Section 15.3.3, “Statements That Cause an Implicit ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cluster-operations.html
The cluster_operations table provides a per-operation (stateful primary key op) view of all activity in the NDB Cluster from the point of view of the local data management (LQH) blocks (see The DBLQH Block). (If the MySQL Server is running with ...
https://dev.mysql.com/doc/refman/8.4/en/set-operations.html
Result Set Column Names and Data Types Set Operations with TABLE and VALUES Statements Set Operations using DISTINCT and ALL Set Operations with ORDER BY and LIMIT Limitations of Set Operations SQL set operations combine the results of multiple ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cluster-locks.html
The cluster_locks table provides information about current lock requests holding and waiting for locks on NDB tables in an NDB Cluster, and is intended as a companion table to cluster_operations. Information obtain from the cluster_locks table may ...The transaction ID (transid column) is the identifier generated by the NDB API for the transaction requesting or holding the current ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-programs-ndb-select-count.html
ndb_select_count prints the number of rows in one or more NDB tables. With a single table, the result is equivalent to that obtained by using the MySQL statement SELECT COUNT(*) FROM tbl_name. Usage ndb_select_count [-c connection_string] -ddb_name ...--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cluster-transactions.html
The cluster_transactions table shows information about all ongoing transactions in an NDB Cluster. Together with the block name, this number can be used to look up a given instance in the threadblocks table. You can use this along with the block ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-limitations-syntax.html
Some SQL statements relating to certain MySQL features produce errors when used with NDB tables, as described in the following list: Temporary tables. Trying either to create a temporary table that uses the NDB storage engine or to alter an ...In ...