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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