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New posts in query-performance

When does MS-SQL maintain table indexes?

Is there any way to avoid sub queries?

SQL Server query - not performing as expected, not behaving like I thought it would

Postgres - create table very slow - with partition and BRIN index

SQL EXISTS Why does selecting rownum cause inefficient execution plan?

Selecting n random rows from a huge database with conditions

Very slow elasticsearch term aggregation. How to improve?

Why is one query extremely slow, yet identical query on similar table runs in the blink of an eye

Optimizing COUNT(DISTINCT) slowness even with covering indexes

SQL Server Query Optimisation - Unexpected slowness in a simple query

Performance of nested select

Using 'where then Union' or Using 'Union then Where'

MongoDB Index Complexity

How to force oracle to not to use an index

Why is columnstore index not being used

Postgres Materialize causes poor performance in delete query

Memory Optimized Tables - Slower INSERT than SSD