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How much memory does Vertica use with no configuration?
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Answers
By default Vertica will use 95% of total physical RAM on the machine that the Resource Manager can use for queries.
Refer to:
https://www.vertica.com/docs/9.3.x/HTML/Content/Authoring/SQLReferenceManual/Statements/Built-inPools.htm?zoom_highlight=built in pools#GENERAL