搭建简单的DB2 HADR
简单的HADR，只用一台虚拟机，两个实例间搭建。工作量不大，一般5分钟左右能够完成。步骤：
1.设定归档模式
2.使用备份建立standby数据库
3.设定hadr相关的参数
4.启动并测试
环境：
Server： 127.0.0.1
Primary instance: db2inst4
Primary service/port: 42099
Standby instance: db2inst5
Standby service/port: 41099
DB name: SAMPLE
--注意，切勿使用与DBM SVCENAME 太接近的端口，因为实例会默认使用那端口之后的连续几个端口，所以应尝试更远一些的端口
1.设定归档模式
--在Primary：
--启用归档模式
$ db2 update db cfg for SAMPLE using LOGRETAIN on
DB20000IThe UPDATE DATABASE CONFIGURATION command completed successfully.
--启用LOGINDEXBUILD，以便日志有关索引的操作
$ db2 update db cfg for SAMPLE using LOGINDEXBUILD on
DB20000IThe UPDATE DATABASE CONFIGURATION command completed successfully.
2.使用备份建立standby数据库
--备份primary
$ db2 list db directory
System Database Directory
Number of entries in the directory = 1
Database 1 entry:
Database alias = SAMPLE
Database name = SAMPLE
Local database directory = /home/db2inst4
Database release level = d.00
Comment =
Directory entry type = Indirect
Catalog database partition number = 0
Alternate server hostname =
Alternate server port number =
$ db2 backup db sample to /arch
Backup successful. The timestamp for this backup image is : 20110430101950
$ ls -atrl
total 135208
drwxr-x---3 db2inst1 db2iadm1 4096 Dec8 12:12 db2inst1
drwxr-xr-x 27 root root 4096 Apr 22 23:45 ..
drwxrwxrwx3 root root 4096 Apr 30 10:19 .
-rw-------1 db2inst4 db2iadm1 138297344 Apr 30 10:20 SAMPLE.0.db2inst4.NODE0000.CATN0000.20110430101950.001
--注意修改备份文件属性，以便standby实例能够访问
$ chmod 777 SAMPLE.0.db2inst4.NODE0000.CATN0000.20110430101950.001
--在standby：
$ db2 restore db sample from /arch/ on /home/db2inst5/
DB20000IThe RESTORE DATABASE command completed successfully.
$ db2 list db directory
System Database Directory
Number of entries in the directory = 1
Database 1 entry:
Database alias = SAMPLE
Database name = SAMPLE
Local database directory = /home/db2inst5
Database release level = d.00
Comment =
Directory entry type = Indirect
Catalog database partition number = 0
Alternate server hostname =
Alternate server port number =
--这时候standby的数据库应该是roll-forward pedning的状态，切勿手动roll-forward
$ db2 connect to SAMPLE
SQL1117NA connection to or activation of database "SAMPLE" cannot be made
because of ROLL-FORWARD PENDING.SQLSTATE=57019
3.设定hadr相关的参数
--在Primary：
db2 update db cfg for sample using HADR_LOCAL_HOST 127.0.0.1
db2 update db cfg for sample using HADR_LOCAL_SVC 42099
db2 update db cfg for sample using HADR_REMOTE_HOST 127.0.0.1
db2 update db cfg for sample using HADR_REMOTE_SVC 41099
db2 update db cfg for sample using HADR_REMOTE_INST db2inst5
db2 update db cfg for sample using HADR_SYNCMODE SYNC
db2 update db cfg for sample using HADR_TIMEOUT 3
db2 update db cfg for sample using HADR_PEER_WINDOW 120
db2 connect to sample
db2 quiesce database immediate force connections
db2 unquiesce database
db2 connect reset
--在Standby：
db2 update db cfg for sample using HADR_LOCAL_HOST 127.0.0.1
db2 update db cfg for sample using HADR_LOCAL_SVC 41099
db2 update db cfg for sample using HADR_REMOTE_HOST 127.0.0.1
db2 update db cfg for sample using HADR_REMOTE_SVC 42099
db2 update db cfg for sample using HADR_REMOTE_INST db2inst4
db2 update db cfg for sample using HADR_SYNCMODE SYNC
db2 update db cfg for sample using HADR_TIMEOUT 3
db2 update db cfg for sample using HADR_PEER_WINDOW 120
4.启动并测试
--先启动standby
--在Standby：
$ db2 start hadr on db sample as standby
DB20000IThe START HADR ON DATABASE command completed successfully.
--这时候应该是remote catchup pending的状态：
$ db2pd -d sample -hadr
Database Partition 0 -- Database SAMPLE -- Standby -- Up 0 days 00:03:44
HADR Information:
Role State SyncMode HeartBeatsMissed LogGapRunAvg (bytes)
Standby RemoteCatchupPending Sync 0 1
ConnectStatus ConnectTime Timeout
DisconnectedSat Apr 30 14:09:54 2011 (1304143794) 3
PeerWindowEnd PeerWindow
Null (0) 120
LocalHost LocalService
127.0.0.1 41099
RemoteHost RemoteService RemoteInstance
127.0.0.1 42099 db2inst4
PrimaryFilePrimaryPgPrimaryLSN
S0000000.LOG 0 0x0000000002AC24A1
StandByFileStandByPgStandByLSN StandByRcvBufUsed
S0000000.LOG 0 0x0000000002AC24A1 0%
--再启动Primary
--在Primary：
$ db2 start hadr on database sample as primary
DB20000IThe START HADR ON DATABASE command completed successfully.
$ db2pd -d sample -hadr
Database Partition 0 -- Database SAMPLE -- Active -- Up 0 days 00:00:15
HADR Information:
Role State SyncMode HeartBeatsMissed LogGapRunAvg (bytes)
Primary Peer Sync 0 0
ConnectStatus ConnectTime Timeout
Connected Sat Apr 30 14:14:14 2011 (1304144054) 3
PeerWindowEnd PeerWindow
Sat Apr 30 14:16:26 2011 (1304144186) 120
LocalHost LocalService
127.0.0.1 42099
RemoteHost RemoteService RemoteInstance
127.0.0.1 41099 db2inst5
PrimaryFilePrimaryPgPrimaryLSN
S0000002.LOG 0 0x0000000003288861
StandByFileStandByPgStandByLSN
S0000002.LOG 0 0x0000000003288861
--可以看到一旦Primary也起来了，hadr的状态就会变成peer
--这时候尝试手动归档，看日志是否能够顺利传递到standby
$ db2 archive log for DB sample
DB20000IThe ARCHIVE LOG command completed successfully.
--在Standby观察
$ db2pd -d sample -hadr
Database Partition 0 -- Database SAMPLE -- Standby -- Up 0 days 00:05:25
HADR Information:
Role State SyncMode HeartBeatsMissed LogGapRunAvg (bytes)
Standby Peer Sync 0 0
ConnectStatus ConnectTime Timeout
Connected Sat Apr 30 14:14:14 2011 (1304144054) 3
PeerWindowEnd PeerWindow
Sat Apr 30 14:17:18 2011 (1304144238) 120
LocalHost LocalService
127.0.0.1 41099
RemoteHost RemoteService RemoteInstance
127.0.0.1 42099 db2inst4
PrimaryFilePrimaryPgPrimaryLSN
S0000003.LOG 0 0x000000000366BA41
StandByFileStandByPgStandByLSN StandByRcvBufUsed
S0000003.LOG 0 0x000000000366BA41 0%
--两边当前日志都是S0000003.LOG，测试成功
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