sql server - multiple queries running at the same time WITH(NOLOCK) -


considering highly active remote database in constant use; 2 or perhaps more concurrently running queries returning around 30m records using with(nolock) in query make system unusable?

highly active: around 200 users varying queries ranging 1 record queries maximum above.

constant: 18/7

unusable: 5-15 minute delays. external apps or users not being able reach db query.

you need investigate downtime 'unusable' appropiate. guessing not work. there many situations can make server 'unusable', like:

  • database growth
  • log growth
  • core dump
  • scheduler exhaustion
  • many more

other times server can 'slow' , appear unresponsive. 200 queries scanning nilly-willy 30 million rows table can lead scheduler exhaustion. need investigate. waits , queues methodology use (for instance correctly identify scheduler exhaustion mentioned above).

as nolock: there never valid reason use nolock. users see incorrect data right now. consider using row versioning instead.


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