RE: Long Parse Time for a big Statement
Date: Tue, 18 Jan 2022 15:47:12 +0000
Message-ID: <d112dbf44e904c10bd177ef7d6faeeaa_at_vontobel.com>
Should neither x$glob show something useful, Lothar could resort to SGA heap dump and aggregate chunks with Tanel Poder’s heapdump_analyzer to sum the memory by chunk type. Unfortunately, no allocation reason was shown for TCHK chunks the last time I looked at.
In contrast, an OS trace of kghal* Oracle C functions with call stacks and allocation reason passed as a parameter (or even just a plain call stack sampling as suggested by Stefan Koehler) would definitely provide the most detailed information.
Best regards,
Nenad
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Jonathan Lewis
Sent: Dienstag, 18. Januar 2022 16:26
To: oracle-l_at_freelists.org
Subject: Re: Long Parse Time for a big Statement
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If Lothar can query v$sql the way you've suggested then looking at typecheck memory is worth doing; though it does need to be after an attempt to execute the query since EXPLAIN PLAN behaves differently from the parsing for execution so a positive check for TCHK won't necessarily prove anything. The other detail to watch out for is whether it will be necessary to query x$glob for the correct columns as the statement might not be revealed in v$sql if it fails parsing.
Regards
Jonathan Lewis
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