The IMPORT_COLUMN_STATS procedure imports column-level statistics.
Applicability
This topic applies only to OceanBase Database Enterprise Edition. OceanBase Database Community Edition provides only the MySQL mode.
Syntax
DBMS_STATS.IMPORT_COLUMN_STATS (
ownname VARCHAR2,
tabname VARCHAR2,
colname VARCHAR2,
partname VARCHAR2 DEFAULT NULL,
stattab VARCHAR2,
statown VARCHAR2 DEFAULT NULL,
no_invalidate BOOLEAN DEFAULT FALSE,
force BOOLEAN DEFAULT FALSE);
Parameters
| Parameter | Description |
|---|---|
| ownname | The username. If the username is set to NULL, the current logon username is used by default. |
| tabname | The name of the table to which the column belongs. |
| colname | The name of the column. |
| partname | The name of the table partition. If the table is partitioned and partname is NULL, global statistics and partition column statistics are imported. |
| stattab | The name of the user statistics table from which the statistics are retrieved. |
| statown | The username of the user statistics table from which the statistics are retrieved. |
| no_invalidate | Specifies whether to refresh the plan cache when statistics are collected. If you set the value to TRUE, the plan cache is not refreshed when statistics are collected. |
| force | Specifies whether to perform forced import and ignore the lock status. Default value: FALSE. If you set the value to TRUE, statistics will be imported even if they are locked. |
Exceptions
| Error code | Description |
|---|---|
| ORA-20000 | The object does not exist, or you do not have the required privileges. |
| ORA-20001 | The values in the user statistics table are invalid or inconsistent. |
| ORA-20005 | Statistics on the object are locked. |
Considerations
To call this procedure, you must be the owner of the table. If the object is in the sys tenant, you must be the owner of the table or have the SYSDBA privilege.
Examples
Import the statistics on the col1 column in the tbl1 table of the testUser01 user from the test_stat table.
obclient> CALL DBMS_STATS.IMPORT_COLUMN_STATS ('testUser01', 'tbl1','col1',null, stattab=>'test_stat', statown=>'testUser01');
Query OK, 0 rows affected
