I observe the same thing when I overwrite tables via datapump.
Was just experimenting
1- Import tables using datapump (Table_exists_action = replace)
2- After 2 hours. Import the same tables using the same dump but in other
tablespaces (remap_tablespce)
The first call takes ca. 1 hours, the second one takes more than 5 hours.
In the ASH I see the same wait event.
Database 12.1.0.2, rac, 2 nodes.
Best regards
Ahmed Fikri
-----Original-Nachricht-----
Betreff: Re: enq: CR - block range reuse ckpt [mode=6]
Datum: 2021-04-16T16:32:50+0200
Von: "Jonathan Lewis" <jlewisoracle@xxxxxxxxx>
An: "Noveljic Nenad" <nenad.noveljic@xxxxxxxxxxxx>
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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