Hi MBR,
21 crore => 210 million rows => select for an export
Did you test which part of the export is slow: the actual select or the export of the answer set?
A NUSI just for an export is probably not usefull, maybe this select is faster (depends on the size of the table vs. index) but the index must be maintained.
Compare the runtime vs. a select columns without trim/cast and check DBQL for CPU usage.
What's the actual table DDL and how many rows does it have?
Dieter
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