The IMPORT_INDEX_STATS procedure retrieves statistics on the specified index from the user statistics table and stores them in the dictionary.
Syntax
DBMS_STATS.IMPORT_INDEX_STATS (
ownname VARCHAR2,
indname VARCHAR2,
partname VARCHAR2 DEFAULT NULL,
stattab VARCHAR2,
statown VARCHAR2 DEFAULT NULL,
no_invalidate BOOLEAN DEFAULT FALSE,
force BOOLEAN DEFAULT FALSE,
tabname VARCHAR2 DEFAULT NULL);
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. |
| indname | The name of the index. |
| partname | The name of the 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 during statistics collection. If you set the value to TRUE, the plan cache will not be refreshed during statistics collection. |
| force | Specifies whether to perform forced import and ignore the lock status. Default value: FALSE. If you set the value to TRUE, index statistics will be imported even if they are locked. |
Exceptions
| Error code | Description |
|---|---|
| HY000 |
|
Considerations
You cannot export or import statistics across databases that use different character sets.
Examples
Import and save the statistics on the idx1 index in the tbl1 table of the testUser01 user from the test_stat table to a dictionary.
obclient> CALL DBMS_STATS.CREATE_STAT_TABLE('testUser01', 'test_stat');
Query OK, 0 rows affected
obclient> CALL DBMS_STATS.IMPORT_INDEX_STATS('testUser01', 'idx1',stattab=>'test_stat',tabname=>'tbl1',no_invalidate=>FALSE);
Query OK, 0 rows affected
Note
In Oracle mode, you do not need to specify the tabname parameter because the index is unique under the current user. In MySQL mode, you must specify the table name because indexes are not unique under the current user.
