SQL Scripts for Index Maintenance and Alterations in Oracle:

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1. Disable or Enable an Index Temporarily 

 This script disables an index temporarily for maintenance or testing purposes using the ALTER INDEX ... UNUSABLE statement. Replace 'YOUR_INDEX_NAME' with the name of the index you want to disable. Once you have finished your maintenance or testing, you can re-enable the index using the ALTER INDEX ... REBUILD statement.

-- Query to disable an index temporarily
ALTER INDEX YOUR_INDEX_NAME UNUSABLE;

-- Query to enable an index after it has been disabled
ALTER INDEX YOUR_INDEX_NAME REBUILD;

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2. Rebuild or Reorganize an Index for Performance Optimization 

 These scripts rebuild and reorganize an index for performance optimization. The ALTER INDEX ... REBUILD statement rebuilds the index entirely, reclaiming space and defragmenting the index structure. The ALTER INDEX ... REORGANIZE statement reorganizes the index by compacting it and improving its performance.

-- Query to alter an index's tablespace
ALTER INDEX YOUR_INDEX_NAME REBUILD TABLESPACE NEW_TABLESPACE;

-- Query to alter an index's compression
ALTER INDEX YOUR_INDEX_NAME REBUILD COMPRESS;

3.Alter an Index's Storage Parameters 

These scripts alter an index's storage parameters. The first query moves the index to a new tablespace specified by NEW_TABLESPACE. The ALTER INDEX ... REBUILD statement with the COMPRESS keyword compresses the index, which can save storage space and potentially improve query performance. Please replace 'YOUR_INDEX_NAME' and 'NEW_TABLESPACE' with the actual index name and target tablespace, respectively. Remember to exercise caution when altering indexes, as these operations can impact database performance and require appropriate privileges. Always test changes in a controlled environment before applying them to production systems.

-- Query to alter an index's tablespace
ALTER INDEX YOUR_INDEX_NAME REBUILD TABLESPACE NEW_TABLESPACE;

-- Query to alter an index's compression
ALTER INDEX YOUR_INDEX_NAME REBUILD COMPRESS;

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