| Related Documentation | \nVersion of up.time \naffected | \nAffected Platforms | \n
| \n | \nAll | \nAll | \n
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The up.time MySQL Advanced Metrics monitor collects the following performance metrics from a MySQL database:
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| Metric | Explanation |
| Uptime |
| The number of seconds that MySQL has been running. |
| Questions |
| The number of queries that have been sent to the database. |
| Slow Queries |
| The number of queries that take longer than long_query_time to complete. |
| Open Tables |
| The number of database tables that are opened independently by each concurrent thread. |
| QPSA |
| The average number of queries, per second, that must be exceeded before up.time generates an alert. |
| Bytes Received |
| The number of bytes received by the server. |
| Bytes Sent |
| The number of bytes sent by the server to all clients. |
| Delayed Insert Threads |
| The number of delayed insert threads that must be exceeded before up.time sends an alert. |
| Delayed Errors |
| The number of delayed insert threads that had an error. |
| Max Used Connections |
| The maximum number of connections that have been in simultaneous use since the server was started. |
| Threads Connected |
| The maximum number of clients that can be connected to the database at any one time. |
| Threads Running |
| The number of threads that are running, which can be used to determine whether or not the database is becoming overloaded. |
| QCache Inserts |
| The number of queries added to the query cache. |
| QCache Hits |
| The number of hits to the query cache (qcache_hits) to determine the number of query results taken directly from the cache instead of executing them. |
| QCache Lowmem Prunes |
| The number of QCache_lowmem_prunes that can be deleted from the cache because of low memory. |
| QCache Not Cached |
| The maximum number of queries that are not cached. |
| QCache Free Memory |
| The amount of free memory for the query cache. |
| QCache Free Blocks |
| The number of free memory blocks in query cache. |
| QCache Table Blocks |
| The amount of query cache memory fragmentation. |