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Results tagged with mysql
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user 61537
All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.
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MySQL: delete...where..in( ) vs delete..from..join, and locked tables on delete with subselect
Explaining the query shows that the existing index on VARIABLE_SUBSTITUTION.BUILDRESULTSUMMARY_ID is not used:
mysql> explain delete from VARIABLE_SUBSTITUTION where BUILDRESULTSUMMARY_ID in (
-> … In addition to that, it seems to block queries that try to insert into BUILDRESULTSUMMARY, output from show engine innodb status:
---TRANSACTION 68603695, ACTIVE 157 sec starting index read
mysql tables …
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