| Measurement |
Description |
Measurement Unit |
Interpretation |
| Cache_hits |
Indicates the number of times the cache was accessed during the last measurement period. |
Number |
|
| Free_blocks |
Indicates the number of free memory blocks in the query cache currently. |
Number |
|
| Free_memory |
Indicates the amount of free memory in the query cache. |
MB |
A low value of this measure could cause subsequent queries to be rejected by the cache, owing to low memory availability. It would be good practice to tune the cache memory to handle more load. |
| Non_cached_queries |
Indicates the number of queries that were not cached (not cacheable due to their QUERY_CACHE_TYPE) during the last measurement period. |
Number |
|
| Queries_added |
Indicates the number of queries added to the cache during the last measurement period. |
Number |
|
| Queries_deleted |
Indicates the number of queries that were deleted from the cache during the last measurement period. |
Number |
A high value could indicate low memory allocation for the query cache. Since reading from the cache is less expensive than reading directly from the database, a higher memory allocation to the cache is advisable. |
| Queries_registered |
Indicates the number of queries that are registered with the cache. |
Number |
|
| Total_blocks |
Indicates the total number of blocks in the query cache currently. |
Number |
|
| Total_queries |
This is the sum of cache inserts, cache hits, and non-cached queries during the last measurement period. |
Number |
|