vacuum / analyze parent tables on partitioned tables.

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От Bert
Тема vacuum / analyze parent tables on partitioned tables.
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Msg-id CAFCtE1n_mwfBDKhDDQucqKJV2hYffdhytuWC-=AHk6ouO5c1Ww@mail.gmail.com
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Hello,

I wrote a script to make sure all tables are vacuumed and analyzed every evening. This works very well, but I have a question:
I save in a table the start and end time of a vacuum/analyze. This way I can measure what tables take a long time to vaccum/analyze, and what tables are slow. (and much more).

But I have noticed that the parent table of a partitioned table also takes a long time. Here is a snap shot of the following table

table_name ; avg runt time; max run time; min run time
"f_transaction_1";"00:03:07.8";"00:03:10";"00:03:03"
"f_transaction";"00:02:19.8";"00:02:25";"00:02:16"

f_tranaction_1 is 15GB data + 12GB of indexes. (I know, a lot of indexes). f_tranaction is totally empy, but also contains all indexes. Which means 0B table zise, and 140kB index size.

Does anyone has an idea why in this case the vacuum/analyze takes almost as long on the parent table as on the biggest child table? (the other child tables are smaller, and their vacuum/analyze time is much shorter).

wkr,
Bert

--
Bert Desmet
0477/305361

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