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Oracle Tips: Oracle Index Rebuild Command

Oracle Tips by Burleson Consulting

Rebuilding the Unbalanced Indexes

As we see, we have created the list of indexes to be rebuilt, specifying the tablespace names (Listing 8.9) Please note that Oracle’s index rebuild command is very fast when compared to dropping and recreating the index.

IMPORTANT - See my updates notes on the issues surrounding index rebuilding.

Using internal benchmarks of the rebuild command, a one gigabyte index was completely rebuilt in only 20 seconds. This is because Oracle reads the existing index in order to gather the index node information for the new index. After the index has been read, Oracle will replace the old index tree in the same spot in the tablespace as the old index. For even faster execution time, the unrecoverable clause can be used with the rebuild command.

Listing 8.9 The output from rebuilding the indexes

alter index DON.DON_EK rebuild tablespace INDX_1;
index rebuilt
alter index DON.DON_FK_ACT rebuild tablespace INDX_1;
index rebuilt

. . .


This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:


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