Category Archives: No SRLs available for T-1

log_archive_dest_1配置不当,当时standby redo无法归档引起adg不能实时同步

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标题：log_archive_dest_1配置不当,当时standby redo无法归档引起adg不能实时同步

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oracle database dataguard无法利用standby redo实时同步

2025-08-12T18:41:57.474031+08:00
PR00 (PID:245113): Media Recovery Log /u01/app/oracle/fast_recovery_area/……/2025_08_12/o1_mf_1_34206_n9p6mmkb_.arc
PR00 (PID:245113): Media Recovery Waiting for T-1.S-34207 (in transit)

clear standby redo之后，实时同步一会儿，又无法实时同步

2025-08-12T18:43:28.183908+08:00
PR00 (PID:245113): MRP0: Background Media Recovery cancelled with status 16037
2025-08-12T18:43:28.184131+08:00
Errors in file /u01/app/oracle/diag/rdbms/dclhrdg2/DCLHR/trace/DCLHR_pr00_245113.trc:
ORA-16037: user requested cancel of managed recovery operation
PR00 (PID:245113): Managed Standby Recovery not using Real Time Apply
Recovery interrupted!
Stopping change tracking
2025-08-12T18:43:28.356862+08:00
Errors in file /u01/app/oracle/diag/rdbms/dclhrdg2/DCLHR/trace/DCLHR_pr00_245113.trc:
ORA-16037: user requested cancel of managed recovery operation
2025-08-12T18:43:28.482234+08:00
Background Media Recovery process shutdown (DCLHR)
2025-08-12T18:43:29.178708+08:00
Managed Standby Recovery Canceled (DCLHR)
2025-08-12T18:43:44.724806+08:00
Clearing online log 11 of thread 1 sequence number 34111
2025-08-12T18:44:00.545234+08:00
Clearing online log 12 of thread 1 sequence number 34112
2025-08-12T18:44:10.770626+08:00
Clearing online log 13 of thread 1 sequence number 34113
2025-08-12T18:44:31.911565+08:00
Clearing online log 14 of thread 1 sequence number 34114
2025-08-12T18:44:42.111444+08:00
Clearing online log 15 of thread 1 sequence number 34108
2025-08-12T18:45:06.031673+08:00
Warning: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE has been deprecated.
Warning: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE has been deprecated.
2025-08-12T18:45:06.047722+08:00
Attempt to start background Managed Standby Recovery process (DCLHR)
Starting background process MRP0
2025-08-12T18:45:06.062512+08:00
MRP0 started with pid=219, OS id=245503
2025-08-12T18:45:06.064300+08:00
Background Managed Standby Recovery process started (DCLHR)
2025-08-12T18:45:11.086271+08:00
 Started logmerger process
2025-08-12T18:45:11.100434+08:00

IM on ADG: Start of Empty Journal

IM on ADG: End of Empty Journal
PR00 (PID:245509): Managed Standby Recovery starting Real Time Apply
max_pdb is 3
2025-08-12T18:45:13.275444+08:00
Parallel Media Recovery started with 80 slaves
2025-08-12T18:45:13.392342+08:00
Stopping change tracking
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34207 (in transit)
2025-08-12T18:46:22.717320+08:00
 rfs (PID:245728): krsr_rfs_atc: Identified database type as 'PHYSICAL STANDBY': Client is Foreground (PID:15566)
2025-08-12T18:46:31.950359+08:00
 rfs (PID:244324): Archived Log entry 99 added for B-1149239150.T-1.S-34207 ID 0x57544f44 LAD:32
2025-08-12T18:46:32.185391+08:00
 rfs (PID:245735): krsr_rfs_atc: Identified database type as 'PHYSICAL STANDBY': Client is ASYNC (PID:3334853)
 rfs (PID:245735): Primary database is in MAXIMUM PERFORMANCE mode
2025-08-12T18:46:32.331928+08:00
 rfs (PID:245735): Selected LNO:11 for T-1.S-34208 dbid 1299764411 branch 1149239150
2025-08-12T18:46:32.885400+08:00
PR00 (PID:245509): Media Recovery Log /u01/app/oracle/fast_recovery_area/……/2025_08_12/o1_mf_1_34207_n9p6mo8f_.arc
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34208 (in transit)
2025-08-12T18:46:33.669769+08:00
Recovery of Online Redo Log: Thread 1 Group 11 Seq 34208 Reading mem 0
  Mem# 0: /u01/app/oracle/oradata/DCLHR/std_redo11.log
2025-08-12T18:50:03.011923+08:00
Expanded controlfile section 28 from 141 to 282 records
Requested to grow by 141 records; added 2 blocks of records
2025-08-12T19:16:29.515866+08:00
 rfs (PID:245735): Selected LNO:12 for T-1.S-34209 dbid 1299764411 branch 1149239150
2025-08-12T19:16:29.515943+08:00
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34209 (in transit)
2025-08-12T19:16:30.522048+08:00
Recovery of Online Redo Log: Thread 1 Group 12 Seq 34209 Reading mem 0
  Mem# 0: /u01/app/oracle/oradata/DCLHR/std_redo12.log
2025-08-12T19:46:29.852369+08:00
 rfs (PID:245735): Selected LNO:13 for T-1.S-34210 dbid 1299764411 branch 1149239150
2025-08-12T19:46:29.852443+08:00
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34210 (in transit)
2025-08-12T19:46:30.858423+08:00
Recovery of Online Redo Log: Thread 1 Group 13 Seq 34210 Reading mem 0
  Mem# 0: /u01/app/oracle/oradata/DCLHR/std_redo13.log
2025-08-12T20:16:29.978563+08:00
 rfs (PID:245735): Selected LNO:14 for T-1.S-34211 dbid 1299764411 branch 1149239150
2025-08-12T20:16:30.012723+08:00
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34211 (in transit)
2025-08-12T20:16:30.013045+08:00
Recovery of Online Redo Log: Thread 1 Group 14 Seq 34211 Reading mem 0
  Mem# 0: /u01/app/oracle/oradata/DCLHR/std_redo14.log
2025-08-12T20:46:30.307116+08:00
 rfs (PID:245735): Selected LNO:15 for T-1.S-34212 dbid 1299764411 branch 1149239150
2025-08-12T20:46:30.339601+08:00
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34212 (in transit)
2025-08-12T20:46:30.339893+08:00
Recovery of Online Redo Log: Thread 1 Group 15 Seq 34212 Reading mem 0
  Mem# 0: /u01/app/oracle/oradata/DCLHR/std_redo15.log
2025-08-12T21:16:27.517565+08:00
 rfs (PID:245735): No SRLs available for T-1
2025-08-12T21:16:27.560282+08:00
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34213 (in transit)
2025-08-12T21:16:27.615513+08:00
 rfs (PID:245735): Opened log for T-1.S-34213 dbid 1299764411 branch 1149239150
2025-08-12T21:46:27.633777+08:00
 rfs (PID:245735): Archived Log entry 100 added for B-1149239150.T-1.S-34213 ID 0x57544f44 LAD:32
 rfs (PID:245735): No SRLs available for T-1
2025-08-12T21:46:27.787746+08:00
 rfs (PID:245735): Opened log for T-1.S-34214 dbid 1299764411 branch 1149239150
2025-08-12T21:46:28.439910+08:00
PR00 (PID:245509): Media Recovery Log /u01/app/oracle/fast_recovery_area/……/2025_08_12/o1_mf_1_34213_n9phockd_.arc
2025-08-12T21:46:32.804540+08:00
PR00 (PID:245509): Media Recovery Waiting for T-1.S-34214 (in transit)
2025-08-12T22:16:27.968668+08:00
 rfs (PID:245735): Archived Log entry 101 added for B-1149239150.T-1.S-34214 ID 0x57544f44 LAD:32
 rfs (PID:245735): No SRLs available for T-1

从报错信息看是由于无可用的standby redo导致（No SRLs available for T-1）,查询standby redo状态

[oracle@db03 trace]$ ss

SQL*Plus: Release 19.0.0.0.0 - Production on Wed Aug 13 15:58:46 2025
Version 19.20.0.0.0

Copyright (c) 1982, 2022, Oracle.  All rights reserved.

s
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.20.0.0.0

SQL> elect group#,status from v$standby_log;

    GROUP# STATUS
---------- ----------
        11 ACTIVE
        12 ACTIVE
        13 ACTIVE
        14 ACTIVE
        15 ACTIVE

所有的standby redo都是active状态,导致无可用standby redo,出现该问题的原因,初步怀疑是standby redo无法归档导致,引起该问题的原因怀疑是由于该备库的log_archive_dest_N参数设置不当导致,检查相关参数

*.db_unique_name='DCLHRDG2'
*.fal_client='DCLHRDG2'
*.fal_server='DCLHRDG','DCLHR'
*.log_archive_config='dg_config=(DCLHR,DCLHRDG,DCLHRDG2)'
*.log_archive_dest_1='LOCATION=USE_DB_RECOVERY_FILE_DEST valid_for=(all_logfiles,all_roles) db_unique_name=DCLHRDG'
*.log_archive_dest_2='service=DCLHR lgwr async valid_for=(online_logfiles,primary_role) db_unique_name=DCLHR'
*.log_archive_dest_3='service=DCLHRDG2 lgwr async valid_for=(online_logfiles,primary_role) db_unique_name=DCLHRDG2'

比较明显由于log_archive_dest_1和log_archive_dest_3的相关参数配置不对导致standby redo无法通过log_archive_dest_1进行归档导致,正确的配置方式为

*.log_archive_dest_1='LOCATION=USE_DB_RECOVERY_FILE_DEST valid_for=(all_logfiles,all_roles) db_unique_name=DCLHRDG'
*.log_archive_dest_3='service=DCLHRDG lgwr async valid_for=(online_logfiles,primary_role) db_unique_name=DCLHRDG'

这样配置之后,该dg库同步日志正常.