on 07-01-2016 8:33 AM
hi guys,
I got a issue, that a LF typed index increased so big.
I have a table with a TIME column to store HH:mm:ss, and in fact, the value for this column is aligned with 5 minute (only 00:00:00, 00:05:00, 00:10:00, etc. will be saved in this column). thus, there are ONLY 288 unique values. and I use LF typed index.
there are about 15 billion data in this table, and if rebuild the LF index, the size will be ~24G. but after the new data inserted, the size of this LF index will increased so much. I got 200G after some days. and when delete and rebuild this index, i return to ~24G.
what's happens? and how to prevent this happen?
PS: I use IQ 16.0 SP8.
With IQ 16, you should be using the HG index instead of LF. Size and performance should be better with an HG on lower cardinality columns. This is a change since IQ 15, but one that has proven to work quite well. Can you try with an HG and see how this behavior changes?
Mark
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