Re: [PROPOSAL] VACUUM Progress Checker.

Hello,
>Yes. Any percent completion calculation will have to account for the case of needing multiple passes through all the indexes.

>Each dead tuple requires 6 bytes (IIRC) of maintenance work mem. So if you're deleting 5M rows with m_w_m=1MB you should be getting many passes through the indexes. >Studying the output of VACUUM VERBOSE will confirm that (or just throw a temporary WARNING in the path where we start the scan).

Yes I see the problem now. I get the message "WARNING: Overall index percentage completion 100.000000" logged > 25 times while vacuuming after 5 million records deleted.
Figuring out number of multiple index passes beforehand, accurately, is the problem to solve. Clearly need to study this some more.
Thank you,
Sameer Thakur | Senior Software Specialist | NTTDATA Global Delivery Services Private Ltd | w. +91.20.6641.7146 | VoIP: 8834.8146 | m. +91 989.016.6656 | sameer(dot)thakur(at)nttdata(dot)com | Follow us on Twitter(at)NTTDATAAmericas

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