Note
This view is available starting with V4.2.0.
Purpose
This view dynamically displays information about the execution of join filters in the current tenant across all OBServer nodes.
Columns
Column |
Type |
Nullable |
Description |
|---|---|---|---|
| SVR_IP | varchar(46) | NO | The IP address of the server. |
| SVR_PORT | bigint(20) | NO | The port number of the server. |
| QC_SESSION_ID | bigint(0) | NO | The Query Coordinator (QC) session ID for the parallel query cursor. For V4.3.x:
|
| QC_INSTANCE_ID | bigint(0) | NO | The Query Coordinator (QC) instance ID for the parallel query cursor. |
| SQL_PLAN_HASH_VALUE | bigint(0) | NO | The hash value of the SQL plan for the parallel query cursor. |
| FILTER_ID | bigint(20) | NO | The ID of the join filter in the cursor, which corresponds to the filter ID in the execution plan. |
| BITS_SET | bigint(0) | NO | The size of the bitmap (join bitmap) used in the BLOOM_FILTER. This field is only used for compatibility in the current version. |
| FILTERED | bigint(20) | NO | The number of rows processed by the join filter. |
| PROBED | bigint(20) | NO | The total number of rows in the right table that have passed the bitmap filter test, including both filtered and unfiltered rows. |
| ACTIVE | bigint(0) | NO | Indicates whether the filter is active (YES) or inactive (NO). |
| CON_ID | bigint(20) | NO | The ID of the container to which the data belongs. |
| TRACE_ID | varchar(64) | NO | The trace ID corresponding to the SQL statement. |
Sample query
Query the information about the execution of join filters in the current tenant across all OBServer nodes in the user tenant.
obclient [oceanbase]> SELECT * FROM oceanbase.GV$SQL_JOIN_FILTER;
The query result is as follows:
+----------------+----------+---------------+----------------+---------------------+-----------+----------+----------+--------+--------+--------+------------------------------------+
| SVR_IP | SVR_PORT | QC_SESSION_ID | QC_INSTANCE_ID | SQL_PLAN_HASH_VALUE | FILTER_ID | BITS_SET | FILTERED | PROBED | ACTIVE | CON_ID | TRACE_ID |
+----------------+----------+---------------+----------------+---------------------+-----------+----------+----------+--------+--------+--------+------------------------------------+
| 11.xxx.xxx.xxx | 28825 | NULL | NULL | NULL | 0 | NULL | 0 | 0 | NULL | 1002 | y70***************************-0-0 |
| 11.xxx.xxx.xxx | 28825 | NULL | NULL | NULL | 0 | NULL | 0 | 0 | NULL | 1002 | y70***************************-0-0 |
| 11.xxx.xxx.xxx | 28825 | NULL | NULL | NULL | 0 | NULL | 0 | 0 | NULL | 1002 | y70***************************-0-0 |
+----------------+----------+---------------+----------------+---------------------+-----------+----------+----------+--------+--------+--------+------------------------------------+
3 rows in set