INNODB_SYS_TABLESTATS view provides status
information about performance statistics for
InnoDB tables. These statistics represent
low-level information used by the MySQL optimizer to calculate
which index to use when querying an
table. This information is derived from in-memory data structures
rather than corresponding to data stored on disk.
InnoDB tables are represented in this view if
they have been opened since the last server restart, and not aged
out of the table cache. Tables for which persistent stats are
available are always represented in this view.
|An identifier representing the table for which statistics are available,
using the same value as
|The name of the table, using the same value as
|The value is |
|The current estimated number of rows in the table. Updated after each DML operation. Could be imprecise if uncommitted transactions are inserting into or deleting from the table.|
|Number of pages on disk that store the clustered index, which holds the
|Number of pages on disk that store all secondary indexes for the table. This value might be null if no statistics are collected yet for the table.|
|The number of rows modified by DML operations, such as
|When this counter reaches zero, the table metadata can be evicted from the table cache.|
This table is primarily useful for expert-level performance monitoring, or when developing performance-related extensions for MySQL.
INFORMATION_SCHEMA is a
general-purpose way to monitor the MySQL server, use this
table rather than the corresponding
system table for any new monitoring application you develop.
You must have the
PROCESS privilege to
query this table.
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