Why is DataGrip such a memory hog?
Answered
I open DataGrip, open and run a single query against AdventureWorks, than I open SSMS 18 and do the exact same thing. DataGrip needs 852 MB of RAM to accomplish that simple task, SSMS 18 only 102 MB.
Why is DataGrip using so much RAM?
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Since IDE uses Java it's configured with default heap space to 750Mb. You can change it to lower value but it could affect IDE performance dramatically.