Re: Need help with standby database REAL TIME APPLY

From: Neil Chandler <neil_chandler_at_hotmail.com>
Date: Tue, 28 Jul 2020 21:49:59 +0000
Message-ID: <DB7PR10MB2090264F4F2395C6AABAAF6E85730_at_DB7PR10MB2090.EURPRD10.PROD.OUTLOOK.COM>

Sandy,

the only thing that looks strange in the output below is:

Current Log File Groups Configuration: Thread # Online Redo Log Groups Standby Redo Log Groups Status

(UTILS) (UTILS_DB1)

    0         26                      0                       Insufficient SRLs
    Warning: standby redo logs not configured for thread 0 on UTILS_DB1
    1         2                       5                       Sufficient SRLs

You have 26 online redo log groups on Thread 0 on the primary?

on the primary and on the standby, can you remove anything that interferes with the output, like "break on thread#" and

select * from v$log;
select * from v$standby_log;
select * from v$logfile;

and compare the output.

I assume if you do an "alter system archive log current" on the primary and check the standby, it does a catch-up then starts to fall behind again?

select * from v$dataguard_stats order by name;

Neil Chandler

From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> on behalf of Sandra Becker <sbecker6925_at_gmail.com> Sent: 28 July 2020 18:43
To: Hameed, Amir <Amir.Hameed_at_xerox.com> Cc: Andrew Kerber <andrew.kerber_at_gmail.com>; Leng Burgess <lkaing_at_gmail.com>; oracle-l <oracle-l_at_freelists.org> Subject: Re: Need help with standby database REAL TIME APPLY

I had dropped/recreated the log files several times already. I did try to defer/enable the standby destination from the primary. It didn't make a difference.

Sandy

On Tue, Jul 28, 2020 at 11:33 AM Hameed, Amir <Amir.Hameed_at_xerox.com<mailto:Amir.Hameed_at_xerox.com>> wrote:

Hi Sandy,

I have seen similar issue in the past and the solution was to drop all SRL and recreate them. Once you do that, you may also want to DISABLE the standby destination from primary and then re-enable it.

Thanks,

Amir

From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> <oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org>> On Behalf Of Sandra Becker Sent: Tuesday, July 28, 2020 12:21 PM
To: Andrew Kerber <andrew.kerber_at_gmail.com<mailto:andrew.kerber_at_gmail.com>> Cc: Leng Burgess <lkaing_at_gmail.com<mailto:lkaing_at_gmail.com>>; oracle-l <oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>> Subject: Re: Need help with standby database REAL TIME APPLY

I verified all online and standby logs are the same size on both the primary and the standby. Unfortunately, we no longer have Oracle support. My boss cancelled it earlier this year as a money saving strategy. We do have support from Spinnaker, but they've been less than helpful the last 3 times I tried to get help from them. Guess that's my only option right now. Worst case scenario, I wipe out the standby and start all over. I was trying to avoid that scenario.

Thanks everyone for your help.

Sandy

On Tue, Jul 28, 2020 at 10:13 AM Andrew Kerber <andrew.kerber_at_gmail.com<mailto:andrew.kerber_at_gmail.com>> wrote:

Ok, kind of a shot in the dark, but look at the gv$standby_logfile view and make sure all the standby logs and redo logs are the same size. If thats not the issue, get with Oracle support, I cant think of anything else.

On Tue, Jul 28, 2020 at 10:57 AM Sandra Becker <sbecker6925_at_gmail.com<mailto:sbecker6925_at_gmail.com>> wrote:

Stopped/started managed recovery. No change.

On Tue, Jul 28, 2020 at 9:48 AM Andrew Kerber <andrew.kerber_at_gmail.com<mailto:andrew.kerber_at_gmail.com>> wrote:

Now you might stop and start managed recovery and see if that helps.

On Tue, Jul 28, 2020 at 10:47 Sandra Becker <sbecker6925_at_gmail.com<mailto:sbecker6925_at_gmail.com>> wrote:

From the primary:

Online Redo **

THREAD#  GROUP#  SEQUENCE# MBR     MBYTES ARC STATUS                    FIRST_TIME
------- ------- ---------- --- ---------- --- ------------------------- -------------------
      1      11      29356   2       1024 YES INACTIVE                  2018-10-06 22:31:22
      1      12      29354   2       1024 YES INACTIVE                  2018-10-06 22:30:16
      2      14     187355   2       1024 NO  CURRENT                   2020-07-28 15:30:01
      2      15     187354   2       1024 YES INACTIVE                  2020-07-28 15:15:01

From the standby:

SELECT TYPE, COUNT(*) FROM V$LOGFILE GROUP BY TYPE; TYPE COUNT(*)
-------- ----------

ONLINE            8
STANDBY          20

Neil - I have the break on thread# set in my session. I did explicitly use the THREAD 1 (or 2) when I added the standby redo logs to both the primary and the standby. I also dropped the standby redo logs for THREAD 0.

Sandy

On Tue, Jul 28, 2020 at 9:00 AM Andrew Kerber <andrew.kerber_at_gmail.com<mailto:andrew.kerber_at_gmail.com>> wrote:

Can you please send us the same output for the redo logs on the primary? (not the standby redo logs)?

On Tue, Jul 28, 2020 at 9:31 AM Sandra Becker <sbecker6925_at_gmail.com<mailto:sbecker6925_at_gmail.com>> wrote:

I have 5 SRLs for each thread, but the alert log still says "No standby redo logfiles available for T-2".

SELECT
thread#,group#, sequence#, used, archived, status, ROUND(bytes/1024/1024) mbytes, last_time FROM v$standby_log
ORDER BY

        thread#,
        group#;



THREAD#  GROUP#  SEQUENCE#       USED ARC STATUS                        MBYTES LAST_TIME
------- ------- ---------- ---------- --- ------------------------- ---------- -------------------
      1      21          0          0 YES UNASSIGNED                      1024
             22          0          0 YES UNASSIGNED                      1024
             23          0          0 YES UNASSIGNED                      1024
             24          0          0 YES UNASSIGNED                      1024

             25          0          0 YES UNASSIGNED                      1024

      2      31          0          0 YES UNASSIGNED                      1024
             32          0          0 YES UNASSIGNED                      1024
             33          0          0 YES UNASSIGNED                      1024
             34          0          0 YES UNASSIGNED                      1024
             35          0          0 YES UNASSIGNED                      1024

On Tue, Jul 28, 2020 at 8:08 AM Sandra Becker <sbecker6925_at_gmail.com<mailto:sbecker6925_at_gmail.com>> wrote:

Ok, redoing the SRLs.

Sandy

On Tue, Jul 28, 2020 at 7:45 AM Andrew Kerber <andrew.kerber_at_gmail.com<mailto:andrew.kerber_at_gmail.com>> wrote:

You need one more srl per thread on the standby than primary redo logs. Ie, if you have 4 redo logs per thread on the primary you need at least 5 standby redo logs per thread.

On Tue, Jul 28, 2020 at 8:41 AM Sandra Becker <sbecker6925_at_gmail.com<mailto:sbecker6925_at_gmail.com>> wrote:

I added 6 more standby redo log groups to thread 2. Didn't make any difference. Still seeing the message "RFS[8]: No standby redo logfiles available for T-2". Today's dgmgrl output:

Database Role: Physical standby database Primary Database: UTILS

Ready for Switchover: No
Ready for Failover: Yes (Primary Running)

Capacity Information:

    Database   Instances        Threads
    UTILS      1                2
    UTILS_DB1  1                1

Warning: the target standby has fewer instances than the primary database, this may impact application performance

Temporary Tablespace File Information: UTILS TEMP Files: 1
UTILS_DB1 TEMP Files: 1

  Flashback Database Status:
    UTILS: Off
    UTILS_DB1: Off

  Data file Online Move in Progress:
    UTILS: No
    UTILS_DB1: No

Standby Apply-Related Information:

    Apply State:      Running
    Apply Lag:        2 minutes 9 seconds (computed 15 seconds ago)
    Apply Delay:      0 minutes

  Transport-Related Information:
    Transport On:      Yes
    Gap Status:        No Gap
    Transport Lag:     2 minutes 9 seconds (computed 15 seconds ago)

Transport Status: Success

Log Files Cleared:
UTILS Standby Redo Log Files: Cleared UTILS_DB1 Online Redo Log Files: Cleared UTILS_DB1 Standby Redo Log Files: Available

Current Log File Groups Configuration: Thread # Online Redo Log Groups Standby Redo Log Groups Status

(UTILS) (UTILS_DB1)

    0         22                      0                       Insufficient SRLs
    Warning: standby redo logs not configured for thread 0 on UTILS_DB1
    1         2                       4                       Sufficient SRLs

Future Log File Groups Configuration:
Thread # Online Redo Log Groups Standby Redo Log Groups Status

(UTILS_DB1) (UTILS)

    1         3                       4                       Sufficient SRLs

  Current Configuration Log File Sizes:
    Thread #   Smallest Online Redo      Smallest Standby Redo
               Log File Size             Log File Size
               (UTILS)                   (UTILS_DB1)
    1          1024 MBytes               1024 MBytes

  Future Configuration Log File Sizes:
    Thread #   Smallest Online Redo      Smallest Standby Redo
               Log File Size             Log File Size
               (UTILS_DB1)               (UTILS)
    1          1024 MBytes               1024 MBytes

  Apply-Related Property Settings:
    Property                        UTILS Value              UTILS_DB1 Value
    DelayMins                       0                        0
    ApplyParallel                   AUTO                     AUTO

  Transport-Related Property Settings:
    Property                        UTILS Value              UTILS_DB1 Value
    LogXptMode                      ASYNC                    ASYNC
    RedoRoutes                      <empty>                  <empty>
    Dependency                      <empty>                  <empty>
    DelayMins                       0                        0
    Binding                         optional                 optional
    MaxFailure                      0                        0
    MaxConnections                  1                        1
    ReopenSecs                      300                      300
    NetTimeout                      30                       30
    RedoCompression                 DISABLE                  DISABLE
    LogShipping                     ON                       ON

  Automatic Diagnostic Repository Errors:
    Error                       UTILS    UTILS_DB1
    No logging operation        NO       NO
    Control file corruptions    NO       NO
    SRL Group Unavailable       NO       NO
    System data file missing    NO       NO
    System data file corrupted  NO       NO
    System data file offline    NO       NO
    User data file missing      NO       NO
    User data file corrupted    NO       NO
    User data file offline      NO       NO

Sandy

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Received on Tue Jul 28 2020 - 23:49:59 CEST

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