Should neither x$glob show something useful, Lothar could resort to SGA heap
dump and aggregate chunks with Tanel Poder’s heapdump_analyzer to sum the
memory by chunk type. Unfortunately, no allocation reason was shown for TCHK
chunks the last time I looked at.
In contrast, an OS trace of kghal* Oracle C functions with call stacks and
allocation reason passed as a parameter (or even just a plain call stack
sampling as suggested by Stefan Koehler) would definitely provide the most
detailed information.
Best regards,
Nenad
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> On Behalf
Of Jonathan Lewis
Sent: Dienstag, 18. Januar 2022 16:26
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Long Parse Time for a big Statement
*** E-Mail from outside Vontobel: Do not click on links or open attachments
unless you know the content is safe. ***
If Lothar can query v$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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