Hello,
In my db I have a table with ~300million rows on which I have to perform ~1k aggregation queries periodically. I have noticed that if I delete even a small amount of rows from the table I have a greatly reduced performance compared to when no delete has been made. Specifically, with no delete the 1k queries complete in about 2 hours, if I delete a few records the task completes in about 10-12 hours.
Inserting new rows in the table does not present the issue. Moreover if I dump and restore the table after the delete, everything’s back to normal and the queries execute fast.
So the issue seems to be related to the fact that monet does not actually delete the records from the bat file, right? Are you aware of the issue? Is there some kind of vacuum operation available? If not, what is the fastest way to dump or copy and restore the table; or is there any other trick that may solve the issue?
Any suggestion would be much appreciated,
Thank you
Stefano