I have a Postgres database with tables in the billion scale. So any aggregate functions such as count() and avg(), as well as "order by random()" are very time consuming. Postgres has pg_catalog which ...
It's a simple select from a temporary table, left joining an existing table on its primary key, with two sub selects using top 1 referring the joined table. In code: SELECT TempTable.Col1, ...
I am trying to get an idea of the size of the "hot data" part of a rather large table, and I was wondering if this could be done directly in mysql. I know that with the percona version of mysql, I can ...
I've heard mention of statistics that SQL Server keeps by default. What are they tracking, and how can I use this information to improve my database?