Deleting millions of rows from SQL

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Occasionally you can end up with very large databases that you need to purge old data from. Unfortunatly you cant delete all the old data in 1 chunk since it will cause you SQL server to stop serviceing anything else (and potentially fill up your logs). Below is a little script I used to delete small chunks of data quickly and efficiently.

while 1 = 1
begin

delete top ( 1000 )
from event_33
where TimeGenerated< getdate()-90if @@rowcount = 0 BREAKend

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