How do I monitor index usage?
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How do I monitor index usage?
Index monitoring is started and stopped using the ALTER INDEX syntax shown below. ALTER INDEX my_index_i MONITORING USAGE; ALTER INDEX my_index_i NOMONITORING USAGE; If you are using a version prior to Oracle 12.1, information about the index usage can be displayed using the V$OBJECT_USAGE view.
How do you check which index is being used in Oracle?
In Oracle SQL Developer, when you have SQL in the worksheet, there is a button “Explain Plan”, you can also hit F10. After you execute Explain plan, it will show in the bottom view of SQL Developer. There is a column “OBJECT_NAME”, it will tell you what index is being used.
Can I ALTER INDEX in Oracle?
In Oracle ALTER INDEX statement is used to change or rebuild an existing index. Prerequisites : The index must be in your own schema or you must have to ALTER ANY INDEX system privilege. To execute the MONITORING USAGE clause, the index must be in your own schema.
How do you make an unusable usable index?
To make an index unusable:
- Query the data dictionary to determine whether an existing index or index partition is usable or unusable.
- Make an index or index partition unusable by specifying the UNUSABLE keyword.
- Optionally, query the data dictionary to verify the status change.
How do you check if a table is being used in Oracle?
Columns
- table_name – table/view name with schema name.
- type – TABLE. VIEW.
- referencing_object – name of object which use specific table/view.
- referencing_type – type of found object.
What makes an oracle index unusable?
Oracle indexes can go into a UNUSABLE state after maintenance operation on the table or if the index is marked as ‘unusable’ with an ALTER INDEX command. A direct path load against a table or partition will also leave its indexes unusable.
How do you know if a table has a trigger?
Expand the database that you want, expand Tables, and then expand the table that contains the trigger for which you want to view the definition. Expand Triggers, right-click the trigger you want, and then click Modify. The definition of the DML trigger appears in the query window.
How do you release table utilization space after truncate operation?
Starting with Oracle 11gR2 (11.2. 0.2), a TRUNCATE statement can also specify the DROP ALL STORAGE clause to release the space currently allocated for a table to the containing tablespace.
