The SET_INDEX_STATS procedure sets index-related information.
Syntax
DBMS_STATS.SET_INDEX_STATS (
ownname VARCHAR2,
indname VARCHAR2,
partname VARCHAR2 DEFAULT NULL,
numrows NUMBER DEFAULT NULL,
force BOOLEAN DEFAULT FALSE,
avgrlen NUMBER DEFAULT NULL,
nummacroblks NUMBER DEFAULT NULL,
nummicroblks NUMBER DEFAULT NULL,
tabname VARCHAR2 DEFAULT NULL);
Parameters
| Parameter | Description |
|---|---|
| ownname | The schema to which the table belongs. |
| indname | The name of the index. |
| partname | The name of the partition. |
| numrows | The number of rows in the index or partition. |
| force | Specifies whether to forcibly set index information and ignore the lock status. Default value: FALSE. If you set the value to TRUE, index statistics will be set even if statistics are locked. |
| avgrlen | The average row length of the index table, in bytes. |
| nummacroblks | The number of macro blocks of the index table. |
| nummicroblks | The number of micro blocks of the index table. |
| tabname | The name of the table. |
Exceptions
| Error code | Description |
|---|---|
| ORA-20000 | The object does not exist, or you do not have the required privileges. |
| ORA-20001 | The input value is invalid. |
| 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 owned by the
systenant, you must be the owner of the table or have theSYSDBAprivilege.The optimizer estimates the number of cached blocks accessed by an index or a statistics table based on the cached data. The total costs of the operation consist of the I/O cost of reading uncached blocks from the disk, CPU cost of fetching cached blocks from the buffer cache, and CPU cost of processing data.
Examples
Set the information of the idx1 index of the testUser01 user.
obclient> CALL DBMS_STATS.SET_INDEX_STATS('testUser01', 'idx1', numrows=>10, avgrlen=>10, tabname=>'tbl1');
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.
