database_*
database_*
The database_* tables store query workload information for a Greenplum Database instance. There are three database tables, all having the same columns:
- database_now is an external table whose data files are stored in $MASTER_DATA_DIRECTORY/gpperfmon/data. Current query workload data is stored in database_now during the period between data collection from the data collection agents and automatic commitment to the database_history table.
- database_tail is an external table whose data files are stored in $MASTER_DATA_DIRECTORY/gpperfmon/data. This is a transitional table for query workload data that has been cleared from database_now but has not yet been committed to database_history. It typically only contains a few minutes worth of data.
- database_history is a regular table that stores historical database-wide query workload data. It is pre-partitioned into monthly partitions. Partitions are automatically added in two month increments as needed.
| Column | Type | Description |
|---|---|---|
| ctime | timestamp | Time this row was created. |
| queries_total | int | The total number of queries in Greenplum Database at data collection time. |
| queries_running | int | The number of active queries running at data collection time. |
| queries_queued | int | The number of queries waiting in a resource group or resource queue, depending upon which resource management scheme is active, at data collection time. |