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 |
+--------------------------------+--------------+-----------------+-----------------+

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https://mariadb.com/kb/en/information-schema-xtradb_internal_hash_tables-table/