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https://dev.mysql.com/doc/refman/8.0/en/myisampack.html
This results in much better performance when accessing individual rows, because you only have to uncompress exactly one row. --force, -f Command-Line Format --force Produce a packed table even if it becomes larger than the original or if the ...When ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-dictionary-tables.html
dictionary_tables contains the columns listed here: table_id The table' unique ID database_name Name of the database containing the table table_name Name of the table status The table status; one of New, Changed, Retrieved, Invalid, or Altered.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ps-tables.html
row *************************** NAME: memory/ndbcluster/Thd_ndb::batch_mem_root ENABLED: YES TIMED: NULL PROPERTIES: VOLATILITY: 0 DOCUMENTATION: Memory used for transaction batching 1 row in set (0.01 sec) . NDB 8.0 provides information in the ...
https://dev.mysql.com/doc/refman/8.0/en/mysqlslap.html
--auto-generate-sql-write-number=N Command-Line Format --auto-generate-sql-write-number=# Type Numeric Default Value 100 How many row inserts to perform. The permitted levels are from 1 to 22, with larger values indicating increasing levels of ...
https://dev.mysql.com/doc/refman/8.0/en/optimization-indexes.html
The index entries act like pointers to the table rows, allowing the query to quickly determine which rows match a condition in the WHERE clause, and retrieve the other column values for those rows. The best way to improve the performance of SELECT ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-hash.html
You should also keep in mind that this expression is evaluated each time a row is inserted or updated (or possibly deleted); this means that very complex expressions may give rise to performance issues, particularly when performing operations (such ... Partitioning by HASH is used primarily to ensure an even distribution of data among a predetermined number of ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-management-hash-key.html
Tables which are partitioned by hash or by key are very similar to one another with regard to making changes in a partitioning setup, and both differ in a number of ways from tables which have been partitioned by range or list. For that reason, ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-types.html
This type of partitioning assigns rows to partitions based on column values falling within a given range. With this type of partitioning, a partition is selected based on the value returned by a user-defined expression that operates on column values ... This section discusses the types of partitioning which are available in MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-filtering.html
Pre-filtering leaves more “room” in these tables for instances of rows for enabled instrument types. If you enable only file instruments with pre-filtering, no rows are collected for nonfile instruments. With post-filtering, nonfile events are ... Events are processed in a producer/consumer fashion: Instrumented code is the source for events and produces events to be ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-mutex-instances-table.html
When some code creates a mutex, a row is added to the mutex_instances table. When a thread attempts to lock a mutex, the events_waits_current table shows a row for that thread, indicating that it is waiting on a mutex (in the EVENT_NAME column), and ... The mutex_instances table lists all the mutexes seen by the Performance Schema while the server ...