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Don Burleson Blog 







Create huge index without large temporary tablespace

Oracle Tips by Donald BurlesonDecember 28, 2016

Question: I have a table with millions of records and I get a error on my TEMPORARY tablespace when creating an index.  How to create an index without having temp tablespace problems?  I get the ora-01652_unable_to extend_temp segment error.

Answer:  Oracle must sort the rows for the index, and this must be done in TEMP or PGA.

You can set a larger TEMP tablespace size or set a large parallel degree, making the operation have more PGA (one for each process).

Open up a 100 gig PGA and sort it in RAM, 300x faster, see my notes on index sorting here.

Parallel processing up to 16 threads on a 4 CPU server. As discussed in MOSC thread 460157.996, a supported way to increase the maximum PGA memory per single SQL query is to increase the degree of parallelism.

You can also set a super-large PGA (during slow processing times)

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