W3cubDocs

/MariaDB

Information Schema XTRADB_INTERNAL_HASH_TABLES Table

MariaDB starting with 10.0.9

The XTRADB_INTERNAL_HASH_TABLES table was added in MariaDB 10.0.9.

The Information Schema XTRADB_INTERNAL_HASH_TABLES table contains InnoDB/XtraDB hash table memory usage information.

The PROCESS privilege is required to view the table.

It has the following columns:

Column	Description
`INTERNAL_HASH_TABLE_NAME`	Hash table name
`TOTAL_MEMORY`	Total memory
`CONSTANT_MEMORY`	Constant memory
`VARIABLE_MEMORY`	Variable memory

Example

SELECT * FROM information_schema.XTRADB_INTERNAL_HASH_TABLES;
+--------------------------------+--------------+-----------------+-----------------+
| INTERNAL_HASH_TABLE_NAME       | TOTAL_MEMORY | CONSTANT_MEMORY | VARIABLE_MEMORY |
+--------------------------------+--------------+-----------------+-----------------+
| Adaptive hash index            |      2217568 |         2213368 |            4200 |
| Page hash (buffer pool 0 only) |       139112 |          139112 |               0 |
| Dictionary Cache               |       613423 |          554768 |           58655 |
| File system                    |       816368 |          812272 |            4096 |
| Lock System                    |       332872 |          332872 |               0 |
| Recovery System                |            0 |               0 |               0 |
+--------------------------------+--------------+-----------------+-----------------+

Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.

© 2019 MariaDB
Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/information-schema-xtradb_internal_hash_tables-table/