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user 131569
A database structure that can improve the speed of queries at the cost of disk space and slower inserts/updates. It stores a copy of one or more columns sorted but structures the data differently to allow faster access.
1
vote
Simple SELECT-query on big table gets stuck in "Sending data" state
I believe that for a small interval the index chosen by the query optimizer is the one that uses the timestamp, so it is faster.
I think a composite index class, timestamp would solve the problem. …
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