Knowing how the application works, these must have been either drop or split
partition commands. The sql_id wasn’t captured, so I’m not sure. The recyclebin
is disabled.
In the end, I discovered that the IO response times were terrible during this
time due to an infrastructure issue, so the checkpoint was running much longer.
I should have checked this better before posting the problem.
Thank you for your input.
Best regards,
Nenad
From: Jonathan Lewis <jlewisoracle@xxxxxxxxx>
Sent: Freitag, 16. April 2021 16:32
To: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
Cc: ORACLE-L (oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
Subject: Re: enq: CR - block range reuse ckpt [mode=6]
When I've seen that enqueue it's been associated with (really) dropping objects
- either from an explicit "drop purge" or as an internal side effect (e.g. when
a split partition creates two new partitions and drops the old one, or you do
some online operation that creates an internal journal table thne drops it on
completion). Possibly it also appears after you've dropped a table and oracle
finally gets around to purging the recyclebin.
Regards
Jonathan Lewis
On Fri, 16 Apr 2021 at 07:46, Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>> wrote:
What could have caused high waits on enq: CR - block range reuse ckpt [mode=6] ?
How to approach the analysis?
The database version is 19.9.0.0.201020.
The wait chains:
SQL> @ash_wait_chains2 event2 "sql_opname='ALTER TABLE'" &today
-- Display ASH Wait Chain Signatures script v0.5 BETA by Tanel Poder (
http://blog.tanelpoder.com ;)
%This SECONDS AAS WAIT_CHAIN
FIRST_SEEN LAST_SEEN
------ ---------- -------
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
------------------- -------------------
65% 9263 .3 -> enq: CR - block range reuse ckpt -> [idle blocker
1,1723,17157 (oracle@svavt02p (CKPT))]
2021-04-16 04:42:49 2021-04-16 07:00:32
25% 3555 .1 -> library cache lock -> enq: CR - block range reuse
ckpt -> [idle blocker 1,1723,17157 (oracle@svavt02p (CKPT))]
2021-04-16 05:21:01 2021-04-16 06:50:42
4% 507 .0 -> enq: CR - block range reuse ckpt -> db file
single write
2021-04-16 04:42:52 2021-04-16 06:56:38
2% 332 .0 -> enq: CR - block range reuse ckpt -> control file
parallel write
Best regards,
Nenad
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