Do you possibly reference column names qualified by schema name, i.e.
My question might sound weird, but in an earlier version Oracle made lots of
recursive calls of parsing functions that allocated lots of memory when columns
were referenced with the schema name within a case expression with lots of
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> On Behalf
Of Lothar Flatz
Sent: Montag, 17. Januar 2022 13:59
Subject: Long Parse Time for a big Statement
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At one customer site we see generated statements, actually reports. The
parsetime for such a statement is over an hour, if it finishes at all.
It is possible we see "ORA-04031:" when we run out of memory in the shared pool.
How big these statements are is hard to tell, since it depends on formatting.
With sql developer formatting i get in one typical example >
The statements are constructed relatively simple.
It seems to be a kind of change report where columns from different tables are
At the beginning is a big case statement where a meaningful name is generated
for a value followed by this values. I counted 7400 case entries as per
statement in one case.
I addition we have a number of big inlists.
All this is running against a union view of 55 Tables.
In other words: If i want to stress the parser I would construct a statement
exactly like this.
However, one hour seems to be a unrealistically long parse time.
Even though that statement needs to be rewritten, but this will take time.
I want to know if there is any quick fix like increasing the shared pool a lot.
(Which I can't test unfortunately any time soon due lack of memory).
Any ideas how to speed up the parse time?
Database version is 19.7. Shared Pool size is 20GB
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