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_at_vontobel.com> 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> _at_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_at_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_at_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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