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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