create index logging, nologging performance test
create index logging, nologging performance test.
For Speed up when creating an index for a large table. we can use nologging clause .
test result:
1, nologging is effective in archivelog database mode. Although, in noarchivelog database mode, by default ,create index will not produce much log , by other words, it's the same speed in noarchivelog mode whether nologging clause is supplied.
2, use nologging clause , performance would improve 40% more or less accord actual environment.
3, parallel is only effective if you have multiple spindles.
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some notes:
insert /*+ append */ wil degrade (at least 2 times) when index exists, so the better way maybe is drop index first, then load data, the create index at last.
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