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Don Burleson Blog 







 Create index Performance Speed Tips

Oracle Database Tips by Donald BurlesonMarch 8, 2015

Question:  I am getting slow performance speed when creating an index on a very large table.  What are the ways to speed-up the creation of an index in Oracle?

Answer:  Creating an index involves a full scan against the target table and a sort, so whatever you can use to speed-up these operations will speed-up the performance of a "create index" statement.  These performance improvements for index creation include:

- Make a huge PGA:  Dedicating a huge RAM region to sorting will avoid a sort to disk, thereby improving to elapsed time required to create a very large index:

alter system set pga_aggregate_target=16G;
alter system set "_pga_max_size"=2000000000;

create index xxx . . .

- Use parallel query:  You can use parallel query to speed-up the index build by improving the speed of the retrieval of the rows from the target table.  Ther is an added performance benefit with parallel create index because each parallel query process gets its own PGA RAM, thereby increasing the sort area size and making the index build run far faster.  The best way is to use a "parallel" hint:

create index /*+ parallel 35 */ xxx . . .

- Use a partitioned index:  You should always partition a very large table, and partition the index.  This improves the performance of both index queries (partition pruning) and index creation in parallel.  See my notes on global vs. local partitioned indexes for more details.

- Use NOLOGGING:  You can use the NOLOGGING option to improve the performance of an index creation.  Beware that there are special considerations with nologging.

create index xxx . . . NOLOGGING . . . 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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