Good practices for proactively preventing queries from randomly becoming slow
66201
Why is my query suddenly slower than it was yesterday?
25273
Anyway to Limit MySQL Query Execution time?
85590
Tools to measure the nonrandomness of database
10500
Sample query/DDL for producing page locks on a clustered index in SQL Server (without hints)
140715
Will running a large query on a secondary database in an availability group affect transaction performance in the primary database?
37349
Why does my query run fast in Environment A, but slow in Environment B?
115725
Strategy for dealing with "which is faster?" questions
27542
How do I implement basic "Long Polling"?
139729
Implement cross-site posting rate limits to slow down spammers
31812
Top techniques to avoid 'data scraping' from a website database
123923
Why is query choosing horrible execution plan?
139728
Query speed based on order of columns
138274
Fetching RAND() rows without ORDER BY RAND() in just one query
701
How do you improve Drupal performance?
72466
Interesting queries on Data Explorer
113783
How can we help users who repeatedly ask similar questions or update constantly?
136997
Studies showing the impact of response time variability on user experience