简介
这时一个集只读,AWT缓存组,Active Standby 复制,client auto failover为一体的集成实验。
整个过程来至于Doc ID 1359840.1, 本文基于此文档按照自己的环境重做了一遍,并更正了其中的小错误,增加了自己的理解。
本文省略了在Oracle端设置缓存组的过程,可以参见前面的文章。
搭建的环境为虚拟机 timesten-hol 上安装了两个TimesTen实例, 实例名分别为tt1122和ttnew, 分别驻留在端口53392(缺省)和55555
tt1122上数据库为cachedb1,ttnew上数据库为cachedb2
虚拟机上还有一个Oracle数据库。
连接实例tt1122的语句为:
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
连接实例ttnew的语句为:
$ . /u01/TimesTen/ttnew/bin/ttenv.sh
$ ttisql -v1 -e "set prompt ‘cachedb2> ‘" "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle"
连接Oracle的语句为:
$ sqlplus tthr/oracle@ttorcl
实例与数据库DSN
两个实例的定义为:
$ cat /etc/TimesTen/instance_info
#SUM 55602 1
[ tt1122 ]
Product=TimesTen11.2.2.6.2
InstallDir=/home/oracle/TimesTen/tt1122
InstanceAdministrator=oracle
DaemonHome=/home/oracle/TimesTen/tt1122/info
BitLevel=64
Component=Client/Server and DataManager
TT_PORT=53392
[ ttnew ]
Product=TimesTen11.2.2.8.11
InstallDir=/u01/TimesTen/ttnew
InstanceAdministrator=oracle
DaemonHome=/u01/TimesTen/ttnew/info
BitLevel=64
Component=Client/Server and DataManager
TT_PORT=55555
实例tt1122上的数据库cachedb1的DSN,为复制源
more /home/oracle/TimesTen/tt1122/info/sys.odbc.ini
[cachedb1]
Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so
DataStore=/home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb1
PermSize=32
TempSize=64
LogFileSize=32
LogBufMB=32
DatabaseCharacterSet=AL32UTF8
OracleNetServiceName=ttorcl
实例ttnew上的数据库cachedb2的DSN,为复制目标
这里有一点必须强调,即Driver必须写自己路径下的Driver,即/u01/TimesTen/ttnew/lib/libtten.so
, 由于最初cachedb2的DSN是从cachedb1拷贝而来,因此最初的Driver写成了Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so, 即使这个.so文件和之前的是一样的,这种写法在后续做client auto failover实验时会产生错误,
more /u01/TimesTen/ttnew/info/sys.odbc.ini
[cachedb2]
Driver=/u01/TimesTen/ttnew/lib/libtten.so
#Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so
DataStore=/home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb2
PermSize=32
TempSize=64
LogFileSize=32
LogBufMB=32
DatabaseCharacterSet=AL32UTF8
OracleNetServiceName=ttorcl
在Oracle数据库中建表
其中t1用于只读缓存组,t2用于AWT缓存组:
$ sqlplus tthr/[email protected]
drop table t1;
drop table t2;
create table t1 (c1 number(22) not null primary key, c2 date, c3 varchar(40));
insert into t1 values (1, sysdate, ‘t1 data inserted in oracle‘);
insert into t1 values (2, sysdate, ‘t1 data inserted in oracle‘);
commit;
create table t2 (c1 number(22) not null primary key, c2 date, c3 varchar(40));
insert into t2 values (1, sysdate, ‘t2 data inserted in oracle‘);
insert into t2 values (2, sysdate, ‘t2 data inserted in oracle‘);
commit;
建立Readonly Autorefresh缓存组
tthr赋予了admin权限是用于克隆active数据库,赋予cache_manager权限是为了做cache admin, 不过我们的例子中使用cacheadm用户来做。
$ ttisql cachedb1
drop user tthr;
create user tthr identified by timesten;
grant admin, create session, cache_manager, create any table to tthr; ???
exit;
建立只读缓存组t1_roa
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
call ttcacheuidpwdset(‘cacheadm‘,‘oracle‘);
call ttcachestart;
create readonly cache group t1_roa autorefresh interval 10 seconds
from t1 (c1 number(22) not null primary key, c2 date, c3 varchar(40));
load cache group t1_roa commit every 100 rows;
select * from t1;
< 1, 2016-07-01 20:04:51, t1 data inserted in oracle >
< 2, 2016-07-01 20:04:51, t1 data inserted in oracle >
exit;
建立AWT缓存组t2_awt
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
create asynchronous writethrough cache group t2_awt
from t2 (c1 number(22) not null primary key, c2 date, c3 varchar(40));
load cache group t2_awt commit every 100 rows;
call ttrepstart;
select * from t2;
< 1, 2016-07-01 20:04:51, t2 data inserted in oracle >
< 2, 2016-07-01 20:04:51, t2 data inserted in oracle >
exit;
创建Active Standby Pair复制
注意指定了固定的复制端口,而不是自动协商的端口。因为ttnew daemon并非在缺省的端口启动
alter cache group t1_roa set autorefresh state paused;
call ttrepstop;
create active standby pair
cachedb1 on "timesten-hol",
cachedb2 on "timesten-hol"
return receipt
store cachedb1 on "timesten-hol" port 11102
store cachedb2 on "timesten-hol" port 11202;
call ttrepstart;
call ttrepstateget;
call ttrepstateset(‘ACTIVE‘);
alter cache group t1_roa set autorefresh state on;
call ttrepstateget;
exit;
克隆Standby数据库, 注意-verbosity 2,给出了很有用的信息
$ ttRepAdmin -verbosity 2 -duplicate -from cachedb1 -host timesten-hol -remotedaemonport 53392 -dsn cachedb2 -uid tthr -pwd timesten -keepcg -cacheuid cacheadm -cachepwd oracle
20:32:38 Contacting remote main daemon at 127.0.0.1 port 53392
20:32:38 Contacting the replication agent for CACHEDB1 ON TIMESTEN-HOL (127.0.0.1) port 11102
20:32:38 Beginning transfer from CACHEDB1 ON TIMESTEN-HOL to CACHEDB2 ON TIMESTEN-HOL
20:33:06 Checkpoint transfer 10 percent complete
20:33:06 Checkpoint transfer 20 percent complete
20:33:06 Checkpoint transfer 30 percent complete
20:33:06 Checkpoint transfer 100 percent complete
20:33:06 Checkpoint transfer phase complete
20:33:09 Log transfer 100 percent complete
20:33:09 Log transfer phase complete
20:33:10 Transfer complete
Subscriber State
CACHEDB1 ON TIMESTEN-H START
_ORACLE ON TIMESTEN-H START
20:33:16 Duplicate Operation Ends
$ ttisql -v1 -e "set prompt ‘cachedb2> ‘" "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle"
call ttrepstart;
call ttcachestart;
call ttrepstateget;
< STANDBY, NO GRID >
exit;
确认只读缓存组正常工作(在Oracle端插入)
$ sqlplus tthr/[email protected]
insert into t1 values (3, sysdate, ‘t1 data inserted in oracle‘);
commit;
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
sleep 70; <- refresh interval定义的是60s
select * from t1;
Command> select * from t1;
< 1, 2016-07-01 20:04:51, t1 data inserted in oracle >
< 2, 2016-07-01 20:04:51, t1 data inserted in oracle >
< 3, 2016-07-02 01:26:34, t1 data inserted in oracle >
确认AWT缓存组正常工作(在TimesTen端插入)
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
insert into t2 values (3, sysdate, ‘t2 data inserted in timesten‘);
commit;
$ sqlplus tthr/[email protected]
select * from t2;
SQL> select * from t2;
C1 C2 C3
---------- --------- ----------------------------------------
1 01-JUL-16 t2 data inserted in oracle
2 01-JUL-16 t2 data inserted in oracle
3 02-JUL-16 t2 data inserted in timesten
在active 节点上创建C/S连接
客户端自动切换相关属性为ttc_server2, ttc_server_dns2 和 tcp_port2
TCP_Port指的是timesten server的端口,而非daemon的端口:
The TCP/IP port number where the TimesTen Server is running. Default for TimesTen release 11.2.2 is 53393 for 32-bit platforms and 53397 for 64-bit platforms.
不带自动切换的连接,指定连接到active:
ttIsqlCS -connstr "ttc_server=timesten-hol;tcp_port=53393;ttc_server_dsn=cachedb1;uid=tthr;pwd=timesten;connectionname=cs_without_failover1" -e "set prompt ‘cs_without_failover1> ‘"
cs_without_failover1> call ttrepstateget;
< ACTIVE, NO GRID >
带自动切换的连接, client auto failover只支持C/S连接,因此必须用ttIsqlCS, 并且总是连接到active 节点:
ttIsqlCS -connstr "ttc_server=timesten-hol;tcp_port=53393;ttc_server_dsn=cachedb1;ttc_server2=timesten-hol;tcp_port2=55556;ttc_server_dsn2=cachedb2;uid=tthr;pwd=timesten;connectionname=cs_with_failover1" -e "set prompt ‘cs_with_failover1> ‘"
cs_with_failover1> call ttrepstateget;
< ACTIVE, NO GRID >
在active和standby节点上确定有哪些连接
至此,在active数据库cachedb1上有两个连接,standby数据库cachedb2上没有连接
ACTIVE:必须在tt1122的环境变量下执行
ttisql -connstr "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle" -e "call ttrepstateget;call ttdatastorestatus;exit" | egrep -i "failover1|active|standby"
< ACTIVE, NO GRID >
< /home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb1, 15427, 000000000138DB90, application , 5900C901, cs_without_failover1 , 1 >
< /home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb1, 15438, 0000000001CB4B90, application , 5900C901, cs_with_failover1 , 2 >
STANDBY: 必须在ttnew的环境变量下执行
ttisql -connstr "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle" -e "call ttrepstateget;call ttdatastorestatus;exit" | egrep -i "failover1|active|standby"
< STANDBY, NO GRID >
调换active和standby的角色
在ACTIVE节点上:
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
call ttrepsubscriberwait(,,,,-1); <- 必须返回 < 00 >
call ttrepstop;
alter cache group t1_roa set autorefresh state paused;
call ttrepdeactivate;
call ttrepstateget;
输出为:
< 00 >
< IDLE, NO GRID >
在STANDBY节点上,使STANDBY成为新的ACTIVE:
$ ttisql -v1 -e "set prompt ‘cachedb2> ‘" "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle"
call ttrepstateset(‘ACTIVE‘);
exit;
在老的ACTIVE节点上:
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
call ttrepstart;
sleep 10;
call ttrepstateget; <- 输出应为< STANDBY, NO GRID >
exit;
至此,cachedb2成为新的active,cachedb1成为standby
在active和standby节点上确定有哪些连接
新STANDBY:必须在tt1122的环境变量下执行
$ ttisql -connstr "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle" -e "call ttrepstateget;call ttdatastorestatus;exit" | egrep -i "failover1|active|standby"
< STANDBY, NO GRID >
< /home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb1, 15427, 000000000138DB90, application , 5900C901, cs_without_failover1 , 1 >
cachedb1成了standby,不具备failover功能的c/s连接仍保留在其上
新ACTIVE: 必须在ttnew的环境变量下执行
这时有了一个连接,而之前cachedb2上是没有连接的,这个连接就是从之前的cachedb1上通过auto client failover切换过来的
$ ttisql -connstr "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle" -e "call ttrepstateget;call ttdatastorestatus;exit" | egrep -i "failover1|active|standby"
< ACTIVE, NO GRID >
< /home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb2, 15518, 00000000021F8C60, application , 0A020081, cs_with_failover1 , 9 >
模拟主节点失效
确保cache agent和rep agent不会自动重启,即重启策略为’manual’ 或 ‘norestart
The daemon restart while there are active connections to the database will cause a database invalidation.
由于目前的active数据库为cachedb2,因此需要重启ttnew实例,重启后,ACTIVE状态变为IDLE
$ . /u01/TimesTen/ttnew/bin/ttenv.sh
$ daemonadmin -restart
$ ttisql -v1 -e "set prompt ‘cachedb2> ‘" "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle"
cachedb2> call ttrepstateget;
< IDLE, NO GRID >
提升standby节点为active,并标记之前的active为失效
$ ttisql -v1 -e "set prompt ‘cachedb1> ‘" "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle"
call ttrepstateset(‘ACTIVE‘);
call ttRepStateSave(‘FAILED‘, ‘cachedb2‘, ‘timesten-hol‘);
call ttrepstateget;
< ACTIVE, NO GRID >
恢复老的active作为standby
$ ttdestroy -force cachedb2
$ ttRepAdmin -verbosity 2 -duplicate -from cachedb1 -host timesten-hol -remotedaemonport 53392 -dsn cachedb2 -uid tthr -pwd timesten -keepcg -cacheuid cacheadm -cachepwd oracle
$ ttisql -v1 -e "set prompt ‘cachedb2> ‘" "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle"cachedb2> call ttrepstart;
cachedb2> call ttcachestart;
cachedb2> call ttrepstateget;
< STANDBY, NO GRID >
确认客户端连接连接的数据库
$ ttisql -connstr "dsn=cachedb1;uid=tthr;pwd=timesten;oraclepwd=oracle" -e "call ttrepstateget;call ttdatastorestatus;exit" | egrep -i "failover1|active|standby"
< ACTIVE, NO GRID >
< /home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb1, 15427, 000000000138DB90, application , 5900C901, cs_without_failover1 , 1 >
< /home/oracle/TimesTen/tt1122/info/DemoDataStore/cachedb1, 16209, 00000000013D4B90, application , 5900C901, cs_with_failover1 , 9 >
$ ttisql -connstr "dsn=cachedb2;uid=tthr;pwd=timesten;oraclepwd=oracle" -e "call ttrepstateget;call ttdatastorestatus;exit" | egrep -i "failover1|active|standby"
< STANDBY, NO GRID >
可以看到,如果是auto client failover,连接总是指向active节点。
参考
- HOWTO : Add Active Standby Pair and Automatic Client Failover To Database With Oracle Cache Connect (Doc ID 1359840.1)