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RMAN backup hangs [message #684756] Sun, 15 August 2021 12:25 Go to next message
ApnaDBA
Messages: 1
Registered: August 2021
Junior Member
Dear Support,

I am in a difficult scenario and i need your suggestions.


On the production server we have installed Oracle database 18.3.

The database instance is Up from last 4 months.

I have just started working on the DB and tried to take the backup of the database using RMAN and even try to EXPDP.

The size of the Database is around 20 gb. During backup process RMAN goes in to non responsive mode and time goes up to 1 hour 30 minuts plus.

some of the sessions blocks the backup operation. their detail is available below from alertlog file.

Alertlog file detail:

2021-08-04T23:57:21.531412+05:00
DIA0 Critical Database Process As Root: Hang ID 177 blocks 1 sessions
Final blocker is session ID 3399 serial# 17211 OSPID 17979 on Instance 1
No resolution will be attempted by Hang Manager
2021-08-04T23:59:21.033792+05:00
DIA0 Critical Database Process As Root: Hang ID 178 blocks 1 sessions
Final blocker is session ID 1136 serial# 65020 OSPID 17984 on Instance 1
No resolution will be attempted by Hang Manager


My action:
When this error is raised and DB response time goes to around 800 milliseconds I killed the RMAN session


the OSPID process detail is as below

ps -ef | grep 17979
oracle 17979 1 0 Mar30 ? 02:25:45 ora_dbw0_orclTAG
oracle 31270 2140 0 11:06 pts/0 00:00:00 grep --color=auto 17979


ps -ef | grep 17984
oracle 17984 1 0 Mar30 ? 02:39:27 ora_ckpt_orclTAG
oracle 31455 2140 0 11:10 pts/0 00:00:00 grep --color=auto 17984


Please advise me to solve this issue.
Also if I want to upgrade the DB from 18c to 19c How can i do that.


Regards,

Re: RMAN backup hangs [message #684757 is a reply to message #684756] Sun, 15 August 2021 18:00 Go to previous messageGo to next message
EdStevens
Messages: 1344
Registered: September 2013
Senior Member
how can we tell what's wrong with your rman job without seeing the rman script/commands that you used? Please post the _formatted_ code.
Re: RMAN backup hangs [message #684867 is a reply to message #684757] Tue, 14 September 2021 09:27 Go to previous messageGo to next message
gazzag
Messages: 1103
Registered: November 2010
Location: Bedwas, UK
Senior Member
In addition to Ed's post, you say DataPump (EXPDP) hangs too? Could you also show us any output from that also please? Additionally O/S details may be useful too.
Re: RMAN backup hangs [message #684868 is a reply to message #684867] Tue, 14 September 2021 10:33 Go to previous messageGo to next message
EdStevens
Messages: 1344
Registered: September 2013
Senior Member
@Gazzag - easy mistake, I've made it myself on occasion. The OP hasn't responded in about a month, so we can only guess that he is no longer "in a difficult situation".

Cool
Re: RMAN backup hangs [message #684869 is a reply to message #684868] Tue, 14 September 2021 10:40 Go to previous message
gazzag
Messages: 1103
Registered: November 2010
Location: Bedwas, UK
Senior Member
Thanks, Ed. Smile
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