How do I recreate an index in Oracle?

Rebuilding an Index In Oracle, you can use the Alter Index Rebuild command to rebuild indexes. It rebuilds a spatial index or a specified partition of a partitioned index.

What is index rebuilding in Oracle?

Oracle provides a fast index rebuild capability that allows you to re-create an index without having to drop the existing index. The currently available index is used as the data source for the index, instead of the table’s being used as the data source.

How do I rebuild a partitioned index in Oracle?

Rebuild the global or local partition index in Oracle

Rebuild partition index by specifying partition name. ALTER INDEX sales_IDX REBUILD PARTITION sales_Q4 TABLESPACE users;
Rebuild the Global index as normal.
Check the index is local or global:
Check the partition index.
Rebuild the partition local index with the script.

Can we rebuild primary key index in Oracle?

You can rebuild them as well — BUT YOU RARELY, IF EVER NEED TO. rebuilding indexes is 99% a waste of time. You should work to find the 1% that might sometime need it and ignore the rest.

Does Oracle automatically rebuild indexes?

Oracle reports that the new Oracle10g Automatic Maintenance Tasks (AMT) will automatically detect indexes that are in need of re-building.

Why do we rebuild indexes?

Performing an index rebuild eliminates fragmentation, compacts the pages based on the existing fill factor setting to reclaim storage space, and also reorders the index rows into contiguous pages. Note you can change the fill factor when rebuilding an index.

Why do we rebuild indexes in Oracle?

When you rebuild an index, you use an existing index as the data source. Creating an index in this manner enables you to change storage characteristics or move to a new tablespace. Rebuilding an index based on an existing data source removes intra-block fragmentation.

Can I force Oracle to rebuild index from table?

In Oracle databases, over time, indexes are fragmented and cause serious performance issues. We should check the indexes regularly and rebuild them if necessary. It is possible to determine whether rebuild is required for an index. First, the relevant index should be analyzed. You can do this with the following command.

How to determine an index needs to be rebuilt?

Using the inspect database tool.

Issue the command: db2 “inspect check database for error state all results keep inspect.out”

Then cd to the DIAGPATH.

Issue the command: db2inspf inspect.out inspect.fmt

If you view the corresponding inspect.fmt file,a message similar to the following will appear: Index phase start.

How to get index last modified time in Oracle?

introduce a bottleneck in the Oracle dictionary. Instead you can use the Oracle LogMiner utility to find the last date-time when a table was modified. This uses the dba_tab_modificationsview. Also see these related notes on using flashback_timewith export. Tracking table changes with dbms_logmnr