catalog_meta_cache_statistics
Overview
View the metadata cache information of the External Catalog in the currently connected FE.
Database
information_schema
Table Information
| Column Name | Type | Description |
|---|---|---|
| CATALOG_NAME | text | The name of the Catalog |
| CACHE_NAME | text | The name of the cache |
| METRIC_NAME | text | The name of the metric |
| METRIC_VALUE | text | The value of the metric |
Usage Example
+----------------------+-----------------------------+----------------------+---------------------+
| CATALOG_NAME | CACHE_NAME | METRIC_NAME | METRIC_VALUE |
+----------------------+-----------------------------+----------------------+---------------------+
| hive_iceberg_minio | iceberg_table_cache | eviction_count | 0 |
| hive_iceberg_minio | iceberg_table_cache | hit_ratio | 0.8235294117647058 |
| hive_iceberg_minio | iceberg_table_cache | average_load_penalty | 5.480102048333334E8 |
| hive_iceberg_minio | iceberg_table_cache | estimated_size | 6 |
| hive_iceberg_minio | iceberg_table_cache | hit_count | 28 |
| hive_iceberg_minio | iceberg_table_cache | read_count | 34 |
| hive_iceberg_minio | iceberg_snapshot_cache | eviction_count | 0 |
| hive_iceberg_minio | iceberg_snapshot_cache | hit_ratio | 0.45454545454545453 |
| hive_iceberg_minio | iceberg_snapshot_cache | average_load_penalty | 5.604907246666666E8 |
| hive_iceberg_minio | iceberg_snapshot_cache | estimated_size | 6 |
| hive_iceberg_minio | iceberg_snapshot_cache | hit_count | 5 |
| hive_iceberg_minio | iceberg_snapshot_cache | read_count | 11 |
The METRIC_NAME column contains the following Caffeine cache performance metrics:
- eviction_count: The number of entries that have been evicted from the cache
- hit_ratio: The ratio of cache requests which were hits (ranges from 0.0 to 1.0)
- average_load_penalty: The average time spent loading new values (in nanoseconds)
- estimated_size: The approximate number of entries in the cache
- hit_count: The number of times cache lookup methods have returned a cached value
- read_count: The total number of times cache lookup methods have been called
