MyISAM表delete记录恢复

发表于 2022 年 11 月 25 日 由 惜分飞

有客户delete删除了myisam表中的部分数据,本来表中4-5w条记录,删除之后值剩余几十条,希望对其进行恢复（该库没有开启binlog）

mysql> select count(1) from db_bet;
+----------+
| count(1) |
+----------+
|       46 |
+----------+
1 row in set (0.00 sec)

通过分析.MYD文件确认数据依旧在文件中
myisam-delete-recovery

通过工具对其删除操作分析,找到记录如下
20221125175222
对其记录入库确认

mysql> select count(1) from db_bet_deleted;
+----------+
| count(1) |
+----------+
|    40158 |
+----------+
1 row in set (0.10 sec)
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OGG-01777 Extract abended as it ran out of sequence numbers used to create TRAIL files

发表于 2022 年 11 月 25 日 由 惜分飞

ogg extract 进程报OGG-01777 Extract abended as it ran out of sequence numbers used to create TRAIL files. The maximum number of TRAIL files allowed is 999999.
20221125124140

由于extract进程已经异常,直接对其抽取的trail文件命名新文件

--ggsci中执行
edit param eora_1  
--修改文件
EXTTRAIL ./dirdat/ab

--ggsci中执行
delete exttrail ./dirdat/aa extract eora_1
add exttrail ./dirdat/ab extract eora_1

GGSCI (xff-source) 51> info eora_1

EXTRACT    EORA_1    Last Started 2022-11-24 22:59   Status STOPPED
Checkpoint Lag       00:00:00 (updated 00:00:00 ago)
Log Read Checkpoint  Oracle Redo Logs
                     First Record         Seqno 248386, RBA 0
                     SCN 0.0 (0)

修改extract pump进程

edit params PORA_1
rmttrail ./dirdat/pc

delete rmttrail ./dirdat/pa extract PORA_1
add rmttrail ./dirdat/pc extract PORA_1
alter ext PORA_1 exttrailsource ./dirdat/ab

GGSCI (xff-source) 56> info pora_1 

EXTRACT    PORA_1    Initialized   2022-11-24 22:59   Status STOPPED
Checkpoint Lag       00:00:00 (updated 00:01:37 ago)
Log Read Checkpoint  File ./dirdat/ab000000
                     First Record  RBA 0

replcat进程处理

alter rep rep1 exttrail ./dirdat/pc

GGSCI (xff-target) 9> info rep1

REPLICAT   REP1      Initialized   2022-11-24 23:00   Status STOPPED
Checkpoint Lag       00:00:00 (updated 00:00:07 ago)
Log Read Checkpoint  File ./dirdat/pb000000
                     First Record  RBA 0

启动相关进程进行传输即可.
另外可以考虑相对简单一点操作,直接delete/add exttrail，delete/add rmttrail同名文件,省去修改param文件的麻烦,注意最终找trail文件名称和偏移量是否准确,如果不正确注意使用类似命令修改

add exttrail ./dirdat/xx, extract xxx, megabytes 1024
add rmttrail ./dirdat/xx, megabytes 1024, seqno 0 , rba 0, extract xxx
alter replicat xxx, extseqno 0, extrba 0
alter extract xxx，extseqno xxxx，extrba xxxx
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ORA-00800: soft external error, arguments: [Set Priority Failed]

发表于 2022 年 11 月 21 日 由 惜分飞

在一套19.14的linux 2节点rac库中,使用sqlplus启动数据库成功,但是alert日志中报ORA-00800: soft external error, arguments: [Set Priority Failed]错误.

2022-09-21T22:20:35.924251+08:00
Starting background process VKTM
2022-09-21T22:20:35.977936+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_vktm_22653.trc  (incident=880052):
ORA-00800: soft external error, arguments: [Set Priority Failed], [VKTM],
 [Check traces and OS configuration], [Check Oracle document and MOS notes], []
Incident details in: /u01/app/oracle/diag/rdbms/orcl/orcl1/incident/incdir_880052/orcl1_vktm_22653_i880052.trc
2022-09-21T22:20:35.980555+08:00
Error attempting to elevate VKTM's priority: no further priority changes will be attempted for this process
VKTM started with pid=6, OS id=22653

Starting background process LMHB
2022-09-21T22:20:36.467831+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_lms0_22703_22708.trc  (incident=920005):
ORA-00800: soft external error, arguments: [Set Priority Failed], [LMS0], 
[Check traces and OS configuration], [Check Oracle document and MOS notes], []
Incident details in: /u01/app/oracle/diag/rdbms/orcl/orcl1/incident/incdir_920005/orcl1_lms0_22703_22708_i920005.trc
2022-09-21T22:20:36.470535+08:00
Error attempting to elevate LMS0's priority: no further priority changes will be attempted for this process

错误提示比较明显,提升进程的优先级失败,通过操作系统命令观察发现确实进程优先级没有提升

[root@oradb01 ~]# ps -eo pid,class,pri,nice,time,args|grep vktm|grep -v grep 
 5656 TS   19   0 00:00:00 ora_vktm_orcl1
30838 RR   41   - 13:08:36 ora_vktm_+ASM1

重新使用srvctl启动数据库,优先级提升正常,alert日志中也无类似警告

[root@oradb01 ~]# ps -eo pid,class,pri,nice,time,args|grep vktm|grep -v grep 
 5716 RR   41   0 00:00:00 ora_vktm_orcl1
30838 RR   41   - 13:18:46 ora_vktm_+ASM1

这个问题一直困惑了很久,今天无意中在mos上发现了相关mos文档,具体参考:(DB50) Clusterware Fails to Start Because CSSD Cannot Get Real-Time Priority (Doc ID 2903663.1),由于 bug 34286265 and bug 34318125(Bug 34649727 Linux: ORA-800 / Set Priority / DB Performance Merge Patch for 19.17 – 34286265 34318125)
20221121210544

尽量不要使用sqlplus去启动数据库,而是选择使用srvctl,避免在rac环境中导致数据库后台关键进程优先级无法提升问题.

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