What is Oracle local index?

What is Oracle local index?

A local index is equipartitioned with the underlying table. Oracle Database partitions the index on the same columns as the underlying table, creates the same number of partitions or subpartitions, and gives them the same partition boundaries as corresponding partitions of the underlying table.

Does index get dropped when table is dropped?

All indexes and triggers associated with a table are dropped. All views and PL/SQL program units dependent on a dropped table remain, yet become invalid (not usable).

How do I drop an index in SQL?

Using SQL Server Management Studio

1. In Object Explorer, expand the database that contains the table on which you want to delete an index.
2. Expand the Tables folder.
3. Expand the table that contains the index you want to delete.
4. Expand the Indexes folder.
5. Right-click the index you want to delete and select Delete.

Does drop index lock table?

A normal DROP INDEX acquires exclusive lock on the table, blocking other accesses until the index drop can be completed. With this option, the command instead waits until conflicting transactions have completed.

How do I know if my index is local?

The “locality” column of dba_part_indexes indicates whether the partitioned index is local (where locality=LOCAL) or global (where locality=GLOBAL) . If no rows are found, then it is a global non-partitioned index.

What does local index mean?

Local Index: A local index is a one-to-one mapping between a index partition and a table partition. In general, local indexes allow for a cleaner “divide and conquer” approach for generating fast SQL execution plans with partition pruning.

How to drop the Index in Oracle?

Rename An Index In this case,we will change the name of an existing INDEX which is already present in the schema.

How to drop indexes/ unique indexes in Oracle?

You can drop an index in oracle using the DROP INDEX command. It removes the named index. The general Syntax is. drop index . ; Here schema name is the owner of the index and index name is the index name. If you don’t provide the schema name, then it is assumed the index exists in the current schema

How to sync and optimize an Oracle Text Index?

– The locking parameter is ignored when SYNC_INDEX is invoked without an index name. – The locking parameter cannot be communicated for automatic synchronizations (that is, sync on commit or sync every ). – When the locking mode is LOCK_WAIT, the mode waits forever and ignores the maxtime setting if it cannot get a lock.

Why is query not using index in Oracle?

Other indexes: You may have other indexes that Oracle perceives as being “better” for the query. In sum, the Oracle optimizer should immediately see a new index and begin using it immediately, invalidating all SQL that might benefit from the index. When Oracle does not use an index, you can force him to use the index with diagnostic tools.