达梦主备手工切换(switchover)
作者：互联网
环境:
OS:Centos 7
DB:DM8
1.启动监视器
在监视器配置文件dmmonintor.ini中,修改MON_DW_CONFIRM参数配置为0
dmmonitor /dmdbms/data/slnngk/dmmonitor.ini
若监视器已经启动的话,可以或略这一步
su - dmdba
[dmdba@host135 ~]$ dmmonitor /dmdbms/data/slnngk/dmmonitor.ini
[monitor] 2022-07-26 09:36:45: DMMONITOR[4.0] V8
[monitor] 2022-07-26 09:36:45: DMMONITOR[4.0] IS READY.
[monitor] 2022-07-26 09:36:45: Received message from(SLNNGK)
WTIME WSTATUS INST_OK INAME ISTATUS IMODE RSTAT N_OPEN FLSN CLSN
2022-07-26 09:36:45 OPEN OK SLNNGK OPEN PRIMARY VALID 16 424687 424688
[monitor] 2022-07-26 09:36:45: Received message from(SLNNGKBAK)
WTIME WSTATUS INST_OK INAME ISTATUS IMODE RSTAT N_OPEN FLSN CLSN
2022-07-26 09:36:45 OPEN OK SLNNGKBAK OPEN STANDBY VALID 16 424686 424686
2.输入show命令查看目前集群状态，其中group GRP1为集群的组名，当前主备集群状态正常，SLNNGK实例为primary，SLNNGKBAK为standby
我这里的mode是设置manual手工切换的
show 2022-07-26 09:37:25 #================================================================================# GROUP OGUID MON_CONFIRM MODE MPP_FLAG GRP1 453332 FALSE MANUAL FALSE <<DATABASE GLOBAL INFO:>> DW_IP MAL_DW_PORT WTIME WTYPE WCTLSTAT WSTATUS INAME INST_OK N_EP N_OK ISTATUS IMODE DSC_STATUS RTYPE RSTAT 192.168.1.135 52141 2022-07-26 09:37:24 GLOBAL VALID OPEN SLNNGK OK 1 1 OPEN PRIMARY DSC_OPEN REALTIME VALID EP INFO: INST_IP INST_PORT INST_OK INAME ISTATUS IMODE DSC_SEQNO DSC_CTL_NODE RTYPE RSTAT FSEQ FLSN CSEQ CLSN DW_STAT_FLAG 192.168.1.135 5236 OK SLNNGK OPEN PRIMARY 0 0 REALTIME VALID 377284 424700 377284 424701 NONE <<DATABASE GLOBAL INFO:>> DW_IP MAL_DW_PORT WTIME WTYPE WCTLSTAT WSTATUS INAME INST_OK N_EP N_OK ISTATUS IMODE DSC_STATUS RTYPE RSTAT 192.168.1.134 52141 2022-07-26 09:37:24 GLOBAL VALID OPEN SLNNGKBAK OK 1 1 OPEN STANDBY DSC_OPEN REALTIME VALID EP INFO: INST_IP INST_PORT INST_OK INAME ISTATUS IMODE DSC_SEQNO DSC_CTL_NODE RTYPE RSTAT FSEQ FLSN CSEQ CLSN DW_STAT_FLAG 192.168.1.134 5236 OK SLNNGKBAK OPEN STANDBY 0 0 REALTIME VALID 62839 424699 62839 424699 NONE DATABASE(SLNNGKBAK) APPLY INFO FROM (SLNNGK), REDOS_PARALLEL_NUM (1): DSC_SEQNO[0], (RSEQ, SSEQ, KSEQ)[377283, 377283, 377284], (RLSN, SLSN, KLSN)[424699, 424699, 424700], N_TSK[0], TSK_MEM_USE[512] REDO_LSN_ARR: (424699) #================================================================================#
3.登陆监视器
输入login 登陆监视器，然后输入用户名和密码(dameng123)
login
username:sysdba
password:
[monitor] 2022-07-26 09:39:46: Login dmmonitor success!
4.查看可切换节点
输入choose switchover GRP1 查看集群可以切换的节点（GRP_DW为集群的分组名称），通过该命令查看到DW1实例节点可以作为primary节点进行切换。
choose switchover GRP1
Can choose one of the following instances to do switchover:
1: SLNNGKBAK
5.切换节点
输入switchover SLNNGKBAK回车，集群开始进行主备切换
switchover SLNNGKBAK
6.检查是否已经切换
show 2022-07-26 09:42:30 #================================================================================# GROUP OGUID MON_CONFIRM MODE MPP_FLAG GRP1 453332 FALSE MANUAL FALSE <<DATABASE GLOBAL INFO:>> DW_IP MAL_DW_PORT WTIME WTYPE WCTLSTAT WSTATUS INAME INST_OK N_EP N_OK ISTATUS IMODE DSC_STATUS RTYPE RSTAT 192.168.1.134 52141 2022-07-26 09:42:30 GLOBAL VALID OPEN SLNNGKBAK OK 1 1 OPEN PRIMARY DSC_OPEN REALTIME VALID EP INFO: INST_IP INST_PORT INST_OK INAME ISTATUS IMODE DSC_SEQNO DSC_CTL_NODE RTYPE RSTAT FSEQ FLSN CSEQ CLSN DW_STAT_FLAG 192.168.1.134 5236 OK SLNNGKBAK OPEN PRIMARY 0 0 REALTIME VALID 377386 426111 377386 426111 NONE <<DATABASE GLOBAL INFO:>> DW_IP MAL_DW_PORT WTIME WTYPE WCTLSTAT WSTATUS INAME INST_OK N_EP N_OK ISTATUS IMODE DSC_STATUS RTYPE RSTAT 192.168.1.135 52141 2022-07-26 09:42:30 GLOBAL VALID OPEN SLNNGK OK 1 1 OPEN STANDBY DSC_OPEN REALTIME VALID EP INFO: INST_IP INST_PORT INST_OK INAME ISTATUS IMODE DSC_SEQNO DSC_CTL_NODE RTYPE RSTAT FSEQ FLSN CSEQ CLSN DW_STAT_FLAG 192.168.1.135 5236 OK SLNNGK OPEN STANDBY 0 0 REALTIME VALID 377376 426110 377376 426110 NONE DATABASE(SLNNGK) APPLY INFO FROM (SLNNGKBAK), REDOS_PARALLEL_NUM (1): DSC_SEQNO[0], (RSEQ, SSEQ, KSEQ)[377385, 377385, 377386], (RLSN, SLSN, KLSN)[426110, 426110, 426111], N_TSK[0], TSK_MEM_USE[512] REDO_LSN_ARR: (426110)
标签：switchover,OK,手工,达梦主备,VALID,INST,DW,OPEN,DSC 来源： https://www.cnblogs.com/hxlasky/p/16519798.html