TimesTen 数据库复制学习：2. 配置Active Standby Pair
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本文为一个动手实验，配置Active Standby Pair，配置3个数据库, master, standby和一个subscriber。拓扑如下：
在本实验中，为简化，三个数据库皆位于同一主机。
创建DSN
[ODBC Data Sources]
master1=TimesTen 11.2.2 Driver
master2=TimesTen 11.2.2 Driver
subscriber1=TimesTen 11.2.2 Driver
[master1]
Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so
DataStore=/tmp/master1
DatabaseCharacterSet=AL32UTF8
ConnectionCharacterSet=AL32UTF8
[master2]
Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so
DataStore=/tmp/master2
DatabaseCharacterSet=AL32UTF8
ConnectionCharacterSet=AL32UTF8
[subscriber1]
Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so
DataStore=/tmp/subscriber1
DatabaseCharacterSet=AL32UTF8
ConnectionCharacterSet=AL32UTF8
在master库中创建表
连接master1
ttisql master1执行以下SQL
CREATE TABLE employees
( employee_id NUMBER(6) PRIMARY KEY,
first_name VARCHAR2(20),
last_name VARCHAR2(25) NOT NULL,
email VARCHAR2(25) NOT NULL UNIQUE,
phone_number VARCHAR2(20),
hire_date DATE NOT NULL,
job_id VARCHAR2(10) NOT NULL,
salary NUMBER(8,2),
commission_pct NUMBER(2,2),
manager_id NUMBER(6),
department_id NUMBER(4)
) ;注意，这个表需要PRIMARY KEY或唯一索引,否则报错：
Command> create table t2(a int);
17061: When DDLReplicationAction=‘INCLUDE‘ tables must be created with a primary key or a unique constraint on non-nullable column(s)
The command failed.
定义active standby pair
连接master1
ttisql master1执行以下语句
CREATE ACTIVE STANDBY PAIR master1, master2 SUBSCRIBER subscriber1;若ASP位于不同主机，可参照以下语法：
CREATE ACTIVE STANDBY PAIR master1 on "host1", master2 on "host2";在master数据库上启动复制代理
Command> CALL ttRepStart;将master数据库的状态设置为active
Command> CALL ttRepStateSet(‘ACTIVE‘);
Command> CALL ttRepStateGet();
< ACTIVE, NO GRID >在active master中创建用户
此用户需要ADMIN权限，在下一步数据库初始化克隆时需要。
CREATE USER repadmin IDENTIFIED BY timesten;
GRANT ADMIN TO repadmin;克隆active master到active standby
$ ttRepAdmin -duplicate -from master1 -host $(hostname) -uid repadmin -pwd timesten master2
$ hostname
timesten-hol将$(hostname)替换为timesten-hol亦可
在standby master上启动复制代理
启动代理后，standby master的状态自动变为STANDBY。
$ ttisql master2
Command> CALL ttRepStart;
Command> CALL ttRepStateGet();
< STANDBY, NO GRID >从standby克隆只读的subscriber
这和从master克隆standby是类似的，只不过换了源和目标
$ ttRepAdmin -duplicate -from master2 -host $(hostname) -uid repadmin -pwd timesten subscriber1在subscriber上启动复制代理
$ttisql subscriber1
Command> CALL ttRepStart;
Command> CALL ttRepStateGet;
< IDLE, NO GRID >IDLE也是一个正常的状态，表示subscriber
在active master中插入数据
在此拓扑中，只有active master是可写的，在master2和subscriber1中执行DML语句所报的错如下：
master2：
16265: This store is currently the STANDBY. Change to ORACLE.EMPLOYEES not permitted.
The command failed.
subscriber1：
8151: ORACLE.EMPLOYEES‘s replication role disallows the requested operation
The command failed.在active master中执行DML:
ttisql master1
然后确认数据正常复制到standby master和subscriber:
$ ttisql master2
Command> select * from employees;
< 202, Pat, Fay, PFAY, 603-123-7777, 1997-08-17 00:00:00, MK_REP, 6000, <NULL>, 201, 20 >
1 row found.
Command> exit
$ ttisql subscriber1
Command> select * from employees;
< 202, Pat, Fay, PFAY, 603-123-7777, 1997-08-17 00:00:00, MK_REP, 6000, <NULL>, 201, 20 >监控Active Standby 环境
利用repschemes命令：
Command> repschemes;
Replication Scheme Active Standby:
Master Store: MASTER1 on TIMESTEN-HOL
Master Store: MASTER2 on TIMESTEN-HOL
Subscriber Store: SUBSCRIBER1 on TIMESTEN-HOL
Excluded Tables:
None
Excluded Cache Groups:
None
Excluded sequences:
None
Store: MASTER1 on TIMESTEN-HOL
Port: (auto)
Log Fail Threshold: (none)
Retry Timeout: 120 seconds
Compress Traffic: Disabled
Store: MASTER2 on TIMESTEN-HOL
Port: (auto)
Log Fail Threshold: (none)
Retry Timeout: 120 seconds
Compress Traffic: Disabled
Store: SUBSCRIBER1 on TIMESTEN-HOL
Port: (auto)
Log Fail Threshold: (none)
Retry Timeout: 120 seconds
Compress Traffic: Disabled
1 replication scheme found.
Command> 从此命令可以看出完整的复制拓扑，并且是整库复制。
利用ttRepAdmin -showconfig命令，可以看出master1的peer是master2，subscriber是subscriber1
$ ttrepadmin -showconfig master1
Self host "TIMESTEN-HOL", port auto, name "MASTER1", LSN 0/17137928, timeout 120, threshold 0
List of subscribers
-------------------
Peer name Host name Port State Proto Track
---------------- ------------------------ ------ ------- ----- -----
SUBSCRIBER1 TIMESTEN-HOL Auto Start 36 0
Last Msg Sent Last Msg Recv Latency TPS RecordsPS
------------- ------------- ------- ------- ---------
00:00:05 - -1.00 -1 -1
Peer name Host name Port State Proto Track
---------------- ------------------------ ------ ------- ----- -----
MASTER2 TIMESTEN-HOL Auto Start 36 0
Last Msg Sent Last Msg Recv Latency TPS RecordsPS
------------- ------------- ------- ------- ---------
00:00:05 00:00:05 -1.00 -1 -1
List of objects and subscriptions
---------------------------------
Table details
-------------
Table : ORACLE.EMPLOYEES Timestamp updates : -
Master Name Subscriber name
----------- ---------------
MASTER1 MASTER2
MASTER1 SUBSCRIBER1
Table details
-------------
Table : ORACLE.EMPLOYEES Timestamp updates : -
Master Name Subscriber name
----------- ---------------
MASTER2 MASTER1
MASTER2 SUBSCRIBER1
Datastore details
-----------------
Master Name Subscriber name
----------- ---------------
MASTER1 MASTER2
MASTER1 SUBSCRIBER1
Datastore details
-----------------
Master Name Subscriber name
----------- ---------------
MASTER2 MASTER1
MASTER2 SUBSCRIBER1
ttrepadmin -showstatus命令
$ ttrepadmin -showstatus master1
Replication Agent Status as of: 2016-05-30 05:47:18
DSN : master1
Process ID : 3942 (Started)
Replication Agent Policy : manual
Host : TIMESTEN-HOL
RepListener Port : 33888 (AUTO)
Last write LSN : 0.17406216
Last LSN forced to disk : 0.17405952
Replication hold LSN : 0.17400072
Replication Peers:
Name : SUBSCRIBER1
Host : TIMESTEN-HOL
Port : 54620 (AUTO) (Connected)
Replication State : STARTED
Communication Protocol : 36
Name : MASTER2
Host : TIMESTEN-HOL
Port : 59256 (AUTO) (Connected)
Replication State : STARTED
Communication Protocol : 36
TRANSMITTER thread(s):
For : SUBSCRIBER1 (track 0)
Start/Restart count : 2
Send LSN : 0.17400072
Transactions sent : 0
Total packets sent : 213
Tick packets sent : 192
MIN sent packet size : 64
MAX sent packet size : 154
AVG sent packet size : 65
Last packet sent at : 05:47:14
Total Packets received: 211
MIN rcvd packet size : 64
MAX rcvd packet size : 128
AVG rcvd packet size : 115
Last packet rcvd‘d at : 05:47:14
TXNs Allocated : 6
TXNs In Use : 0
ACTs Allocated : 4
ACTs In Use : 0
ACTs Data Allocated : 0
Most recent errors (max 5):
TT16290 in transmitter.c (line 8411) at 05:32:14 on 05-30-2016
TT16999 in repagent.c (line 1276) at 05:32:14 on 05-30-2016
TT16025 in repagent.c (line 1227) at 05:32:17 on 05-30-2016
TT16285 in transmitter.c (line 1020) at 05:32:17 on 05-30-2016
TT16999 in transmitter.c (line 1340) at 05:32:17 on 05-30-2016
TRANSMITTER thread(s):
For : MASTER2 (track 0)
Start/Restart count : 2
Send LSN : 0.17400072
Transactions sent : 1
Total packets sent : 263
Tick packets sent : 248
MIN sent packet size : 64
MAX sent packet size : 1699
AVG sent packet size : 71
Last packet sent at : 05:47:14
Total Packets received: 261
MIN rcvd packet size : 64
MAX rcvd packet size : 128
AVG rcvd packet size : 118
Last packet rcvd‘d at : 05:47:14
TXNs Allocated : 3
TXNs In Use : 0
ACTs Allocated : 1
ACTs In Use : 0
ACTs Data Allocated : 0
Most recent errors (max 5):
TT16290 in transmitter.c (line 8411) at 05:28:02 on 05-30-2016
TT16999 in repagent.c (line 1276) at 05:28:02 on 05-30-2016
TT16025 in repagent.c (line 1227) at 05:28:05 on 05-30-2016
TT16285 in transmitter.c (line 1020) at 05:28:05 on 05-30-2016
TT16999 in transmitter.c (line 1340) at 05:28:05 on 05-30-2016
RECEIVER thread(s):
For : MASTER2 (track 0)
Start/Restart count : 1
Transactions received : 0
Total packets sent : 252
Tick packets sent : 0
MIN sent packet size : 64
MAX sent packet size : 120
AVG sent packet size : 119
Last packet sent at : 05:47:15
Total Packets received: 253
MIN rcvd packet size : 64
MAX rcvd packet size : 154
AVG rcvd packet size : 64
Last packet rcvd‘d at : 05:47:15
rxWaitCTN : 0.0
prevCTN : 0.0
STA Blk Data Allocated: 0
STA Data Allocated : 0
Most recent errors (max 5):
TT16025 in repagent.c (line 1227) at 05:28:02 on 05-30-2016
TT16999 in meta.c (line 3166) at 05:28:02 on 05-30-2016
$ ttRepAdmin -log master1
1 log file retained by replication
[[email protected] info]$ ttRepAdmin -self -list master1
Self host "TIMESTEN-HOL", port auto, name "MASTER1", LSN 0/17707272
Operation successful
[[email protected] info]$ ttRepAdmin -self -list master2
Self host "TIMESTEN-HOL", port auto, name "MASTER2", LSN 0/17891592
Operation successful
[[email protected] info]$ ttRepAdmin -self -list subscriber1
Self host "TIMESTEN-HOL", port auto, name "SUBSCRIBER1", LSN -1/-1
Operation successful
[[email protected] info]$ ttrepadmin -receiver -list master1
Peer name Host name Port State Proto Track
---------------- ------------------------ ------ ------- ----- -----
MASTER2 TIMESTEN-HOL Auto Start 36 0
Last Msg Sent Last Msg Recv Latency TPS RecordsPS Logs
------------- ------------- ------- ------- --------- ----
00:00:02 00:00:06 -1.00 -1 -1 1
Peer name Host name Port State Proto Track
---------------- ------------------------ ------ ------- ----- -----
SUBSCRIBER1 TIMESTEN-HOL Auto Start 36 0
Last Msg Sent Last Msg Recv Latency TPS RecordsPS Logs
------------- ------------- ------- ------- --------- ----
00:00:02 - -1.00 -1 -1 1
[[email protected] info]$ ttRepAdmin -wait -name master2 master1
Replication has caught up after 0 seconds
[[email protected] info]$ ttRepAdmin -wait -name subscriber1 master1
Replication has caught up after 0 seconds
[[email protected] info]$ ttRepAdmin -bookmark master1
Replication hold LSN ...... 0/18417928
Last written LSN .......... 0/18430216
Last LSN forced to disk ... 0/18429952
增加复制的表
由于此实验定义的是整库复制，即针对整个Data Store，因此添加新的表时，会自动的添加到复制的scheme中。见下例：
$ ttisql master1
Command> create table t1(a int, primary key(a));
Command> insert into t1 values(1);
1 row inserted.
[[email protected] info]$ ttisql master2
Command> select * from t1;
< 1 >
1 row found.
[[email protected] info]$ ttisql subscriber1
Command> select * from t1;
< 1 >
使用ttRepAdmin -showconfig可以显示增加的复制表：
$ ttrepadmin -showconfig master1
......
List of objects and subscriptions
---------------------------------
Table details
-------------
Table : ORACLE.EMPLOYEES Timestamp updates : -
Master Name Subscriber name
----------- ---------------
MASTER1 MASTER2
MASTER1 SUBSCRIBER1
Table details
-------------
Table : ORACLE.EMPLOYEES Timestamp updates : -
Master Name Subscriber name
----------- ---------------
MASTER2 MASTER1
MASTER2 SUBSCRIBER1
Table details
-------------
Table : ORACLE.T1 Timestamp updates : -
Master Name Subscriber name
----------- ---------------
MASTER1 MASTER2
MASTER1 SUBSCRIBER1
Table details
-------------
Table : ORACLE.T1 Timestamp updates : -
Master Name Subscriber name
----------- ---------------
MASTER2 MASTER1
MASTER2 SUBSCRIBER1
......
清理Active Standby Pair环境
先分别在所有库中停止复制代理，可以看到这时所有的rep state是不变的
$ ttisql -v1 master1
Command> call ttrepstop;
Command> call ttrepstateget;
< ACTIVE, NO GRID >
1 row found.
$ ttisql -v1 master2
Command> call ttrepstop;
Command> call ttrepstateget;
< STANDBY, NO GRID >
$ ttisql -v1 subscriber1
Command> call ttrepstop;
Command> call ttrepstateget;
< IDLE, NO GRID >然后在所有的库中删除ASP:
drop active standby pair;这时所有库的复制状态变为IDLE。
这时还需要在所有的库中删除复制的表，例如：
$ ttisql subscriber1
Command> tables;
ORACLE.EMPLOYEES
ORACLE.T1
2 tables found.
Command> drop table employees;
Command> drop table t1;
总结
- TimesTen配置ASP非常简单，利用ttRepAdmin从主库克隆即可。使用ttRepStateGet得到的状态分别为ACTIVE, STANDBY和IDLE。
- 复制的表需要主键和唯一索引，这和缓存组的要求是一样的。
- ASP通常用于整库复制，这时在active master执行的DDL自动复制到对方。
- 复制中每一个库都需要启动一个对应的复制代理
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