11g RAC TAF 实现 Failover Connect 理解Time Connection Failover/Runtime Connection Failover
2015-10-15 13:49
603 查看
相关脚本
1fff8
客户端监听
RACDB_TAF =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = racscan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = taf_service)
)
)
srvctl modify service -d racdb -s taf_service -q TRUE -P BASIC -m BASIC -e SELECT -z 180 -w 5
重启service
srvctl stop service -d racdb -s taf_service
srvctl start service -d racdb -s taf_service
service状态
运行sql
停止实例，必须是abort，正常的shutdown，会停止sql
srvctl stop instance -d racdb -i racdb1 -o abort
或者是srvctl stop instance -d racdb -i racdb2 -o abort
结果
可以看到中间并没有发生错误，手工停止sql后，实例已经切换过去了
--禁止TAF策略
srvctl modify service -d racdb -s taf_service -q false -P none -m none -e none -z 0 -w 0
测试其他场景
结论
没有TAF，发生故障，会直接中断连接，无法继续操作。
使用TAF，可以保证session继续，不会中断，但session本身被切换了
TAF的Failover type=select 时，执行的sql不会中断，可以做到断点续传
也就是说TAF可以实现运行时的Failover，Runtime connection failover
修改TAF策略语法
srvctl modify service -d RAC11g -s Email -q TRUE -P BASIC -e SELECT -z 180 -w 5 -j LONG 具体各个参数的含义可参见如下注释：
相关脚本
客户端监听
RACDB_TAF =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = racscan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = taf_service)
)
)
srvctl modify service -d racdb -s taf_service -q TRUE -P BASIC -m BASIC -e SELECT -z 180 -w 5
重启service
srvctl stop service -d racdb -s taf_service
srvctl start service -d racdb -s taf_service
service状态
运行sql
停止实例，必须是abort，正常的shutdown，会停止sql
srvctl stop instance -d racdb -i racdb1 -o abort
或者是srvctl stop instance -d racdb -i racdb2 -o abort
结果
可以看到中间并没有发生错误，手工停止sql后，实例已经切换过去了
--禁止TAF策略
srvctl modify service -d racdb -s taf_service -q false -P none -m none -e none -z 0 -w 0
测试其他场景
结论
没有TAF，发生故障，会直接中断连接，无法继续操作。
使用TAF，可以保证session继续，不会中断，但session本身被切换了
TAF的Failover type=select 时，执行的sql不会中断，可以做到断点续传
也就是说TAF可以实现运行时的Failover，Runtime connection failover
修改TAF策略语法
srvctl modify service -d RAC11g -s Email -q TRUE -P BASIC -e SELECT -z 180 -w 5 -j LONG 具体各个参数的含义可参见如下注释：
select instance_name from v$instance;
select distinct sid from v$mystat;
select count(1) from aaa a, aaa b;
select a.SID, a.FAILOVER_TYPE, a.FAILOVER_METHOD, a.FAILED_OVER
from v$session a
where a.sid in (select distinct sid from v$mystat);
set serveroutput on
DECLARE
v_count NUMBER;
BEGIN
for i in 1..10000000 loop
select count(1) into v_count from test;
dbms_output.put_line('i:='||i);end loop;
END;
/
1fff8
客户端监听
RACDB_TAF =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = racscan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = taf_service)
)
)
srvctl modify service -d racdb -s taf_service -q TRUE -P BASIC -m BASIC -e SELECT -z 180 -w 5
重启service
srvctl stop service -d racdb -s taf_service
srvctl start service -d racdb -s taf_service
service状态
SQL>select a.name,
a.NETWORK_NAME,
a.FAILOVER_METHOD,
a.FAILOVER_TYPE,
a.FAILOVER_RETRIES,
a.FAILOVER_DELAY
from dba_services a
where a.NAME = 'taf_service';
2 3 4 5 6 7 8
NAME NETWORK_NAME FAILOVER_M FAILOVER_T FAILOVER_RETRIES FAILOVER_DELAY
------------ ------------ ---------- ---------- ---------------- --------------
taf_service taf_service BASIC SELECT 180 5
运行sql
SQL>select count(1) from aaa a,aaa b;
停止实例，必须是abort，正常的shutdown，会停止sql
srvctl stop instance -d racdb -i racdb1 -o abort
或者是srvctl stop instance -d racdb -i racdb2 -o abort
结果
SQL>select instance_name from v$instance;
INSTANCE_NAME
----------------
racdb2
SQL>select count(1) from aaa a,aaa b;
select count(1) from aaa a,aaa b
*
ERROR at line 1:
ORA-01013: user requested cancel of current operation
SQL>
SQL>
SQL>select instance_name from v$instance;
INSTANCE_NAME
----------------
racdb1
可以看到中间并没有发生错误，手工停止sql后，实例已经切换过去了
--禁止TAF策略
srvctl modify service -d racdb -s taf_service -q false -P none -m none -e none -z 0 -w 0
测试其他场景
| 长时间单SQL/故障前session id,故障后session id | 长时间单SQL/故障前instance id,故障后i nstance id | 故障表象 | 短时间，多SQL/故障前session id,故障后session id | 短时间，多SQL/故障前instance id,故障后i nstance id | 故障表象 | 是否自动转移实例 | |
| 不使用TAF | 33/session已断开，无法连接 | racdb2/session已断开，无法连接 | SQL>select count(1) from aaa a, aaa b; select count(1) from aaa a, aaa b * ERROR at line 1: ORA-00028: your session has been killed ORA-00028: your session has been killed | 153/session已断开，无法连接 | racdb2/session已断开，无法连接 | SQL>set serveroutput on DECLARE v_count NUMBER; BEGIN for i in 1..10000000 loop select count(1) into v_count from test; dbms_output.put_line('i:='||i);end loop; END; /SQL>2 3 4 5 6 7 8 9 ERROR: ORA-03114: not connected to ORACLE DECLARE * ERROR at line 1: ORA-00028: your session has been killed ORA-00028: your session has been killed ORA-06512: at line 5 | 不能 |
| TAF：select | 37/143 | racdb1/racdb2 | 无影响，正常运行，session切换 | 28/153 | racdb1/racdb2 | /SQL>2 3 4 5 6 7 8 9 DECLARE * ERROR at line 1: ORA-25408: can not safely replay call | 可以，但会出现 ORA-25408错误 |
| TAF：session | 153/34 | racdb1/racdb2 | SQL>SQL> select count(1) from aaa a, aaa b * ERROR at line 1: ORA-25408: can not safely replay call | 32/28 | racdb1/racdb2 | SQL>set serveroutput on DECLARE v_count NUMBER; BEGIN for i in 1..10000000 loop select count(1) into v_count from test; dbms_output.put_line('i:='||i);end loop; END; /SQL>2 3 4 5 6 7 8 9 DECLARE * ERROR at line 1: ORA-25408: can not safely replay call |
没有TAF，发生故障，会直接中断连接，无法继续操作。
使用TAF，可以保证session继续，不会中断，但session本身被切换了
TAF的Failover type=select 时，执行的sql不会中断，可以做到断点续传
也就是说TAF可以实现运行时的Failover，Runtime connection failover
修改TAF策略语法
srvctl modify service -d RAC11g -s Email -q TRUE -P BASIC -e SELECT -z 180 -w 5 -j LONG 具体各个参数的含义可参见如下注释：
Usage: srvctl modify service -d <db_unique_name> -s <service_name> [-c {UNIFORM |
SINGLETON}] [-P {BASIC|PRECONNECT|NONE}] [-l
[PRIMARY][,PHYSICAL_STANDBY][,LOGICAL_STANDBY][,SNAPSHOT_STANDBY]] [-y
{AUTOMATIC | MANUAL}][-q {true|false}] [-x {true|false}] [-j {SHORT|LONG}] [-B
{NONE|SERVICE_TIME|THROUGHPUT}] [-e {NONE|SESSION|SELECT}] [-m
{NONE|BASIC}] [-z <integer>] [-w <integer>]
-d <db_unique_name> Unique name for the database
-s <service> Service name
-c {UNIFORM | SINGLETON} Service runs on every active server in the server
pool hosting this service (UNIFORM) or just one server (SINGLETON)
-P {NONE | BASIC | PRECONNECT} TAF policy specification
-l <role> Role of the service (primary, physical_standby,
logical_standby, snapshot_standby)
-y <policy> Management policy for the service (AUTOMATIC or MANUAL)
-e <Failover type> Failover type (NONE, SESSION, or SELECT)
-m <Failover method> Failover method (NONE or BASIC)
-w <integer> Failover delay
-z <integer> Failover retries
-j <clb_goal> Connection Load Balancing Goal (SHORT or LONG). Default is LONG.
-B <Runtime Load Balancing Goal> Runtime Load Balancing Goal (SERVICE_TIME,
THROUGHPUT, or NONE)
-x <Distributed Transaction Processing> Distributed Transaction Processing (TRUE or FALSE)
-q <AQ HA notifications> AQ HA notifications
(TRUE or FALSE)
-h Print usage相关脚本
select instance_name from v$instance;
select distinct sid from v$mystat;
select count(1) from aaa a, aaa b;
select a.SID, a.FAILOVER_TYPE, a.FAILOVER_METHOD, a.FAILED_OVER
from v$session a
where a.sid in (select distinct sid from v$mystat);
set serveroutput on
DECLARE
v_count NUMBER;
BEGIN
for i in 1..10000000 loop
select count(1) into v_count from test;
dbms_output.put_line('i:='||i);end loop;
END;
/
客户端监听
RACDB_TAF =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = racscan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = taf_service)
)
)
srvctl modify service -d racdb -s taf_service -q TRUE -P BASIC -m BASIC -e SELECT -z 180 -w 5
重启service
srvctl stop service -d racdb -s taf_service
srvctl start service -d racdb -s taf_service
service状态
SQL>select a.name,
a.NETWORK_NAME,
a.FAILOVER_METHOD,
a.FAILOVER_TYPE,
a.FAILOVER_RETRIES,
a.FAILOVER_DELAY
from dba_services a
where a.NAME = 'taf_service';
2 3 4 5 6 7 8
NAME NETWORK_NAME FAILOVER_M FAILOVER_T FAILOVER_RETRIES FAILOVER_DELAY
------------ ------------ ---------- ---------- ---------------- --------------
taf_service taf_service BASIC SELECT 180 5
运行sql
SQL>select count(1) from aaa a,aaa b;
停止实例，必须是abort，正常的shutdown，会停止sql
srvctl stop instance -d racdb -i racdb1 -o abort
或者是srvctl stop instance -d racdb -i racdb2 -o abort
结果
SQL>select instance_name from v$instance;
INSTANCE_NAME
----------------
racdb2
SQL>select count(1) from aaa a,aaa b;
select count(1) from aaa a,aaa b
*
ERROR at line 1:
ORA-01013: user requested cancel of current operation
SQL>
SQL>
SQL>select instance_name from v$instance;
INSTANCE_NAME
----------------
racdb1
可以看到中间并没有发生错误，手工停止sql后，实例已经切换过去了
--禁止TAF策略
srvctl modify service -d racdb -s taf_service -q false -P none -m none -e none -z 0 -w 0
测试其他场景
| 长时间单SQL/故障前session id,故障后session id | 长时间单SQL/故障前instance id,故障后i nstance id | 故障表象 | 短时间，多SQL/故障前session id,故障后session id | 短时间，多SQL/故障前instance id,故障后i nstance id | 故障表象 | 是否自动转移实例 | |
| 不使用TAF | 33/session已断开，无法连接 | racdb2/session已断开，无法连接 | SQL>select count(1) from aaa a, aaa b; select count(1) from aaa a, aaa b * ERROR at line 1: ORA-00028: your session has been killed ORA-00028: your session has been killed | 153/session已断开，无法连接 | racdb2/session已断开，无法连接 | SQL>set serveroutput on DECLARE v_count NUMBER; BEGIN for i in 1..10000000 loop select count(1) into v_count from test; dbms_output.put_line('i:='||i);end loop; END; /SQL>2 3 4 5 6 7 8 9 ERROR: ORA-03114: not connected to ORACLE DECLARE * ERROR at line 1: ORA-00028: your session has been killed ORA-00028: your session has been killed ORA-06512: at line 5 | 不能 |
| TAF：select | 37/143 | racdb1/racdb2 | 无影响，正常运行，session切换 | 28/153 | racdb1/racdb2 | /SQL>2 3 4 5 6 7 8 9 DECLARE * ERROR at line 1: ORA-25408: can not safely replay call | 可以，但会出现 ORA-25408错误 |
| TAF：session | 153/34 | racdb1/racdb2 | SQL>SQL> select count(1) from aaa a, aaa b * ERROR at line 1: ORA-25408: can not safely replay call | 32/28 | racdb1/racdb2 | SQL>set serveroutput on DECLARE v_count NUMBER; BEGIN for i in 1..10000000 loop select count(1) into v_count from test; dbms_output.put_line('i:='||i);end loop; END; /SQL>2 3 4 5 6 7 8 9 DECLARE * ERROR at line 1: ORA-25408: can not safely replay call |
没有TAF，发生故障，会直接中断连接，无法继续操作。
使用TAF，可以保证session继续，不会中断，但session本身被切换了
TAF的Failover type=select 时，执行的sql不会中断，可以做到断点续传
也就是说TAF可以实现运行时的Failover，Runtime connection failover
修改TAF策略语法
srvctl modify service -d RAC11g -s Email -q TRUE -P BASIC -e SELECT -z 180 -w 5 -j LONG 具体各个参数的含义可参见如下注释：
Usage: srvctl modify service -d <db_unique_name> -s <service_name> [-c {UNIFORM |
SINGLETON}] [-P {BASIC|PRECONNECT|NONE}] [-l
[PRIMARY][,PHYSICAL_STANDBY][,LOGICAL_STANDBY][,SNAPSHOT_STANDBY]] [-y
{AUTOMATIC | MANUAL}][-q {true|false}] [-x {true|false}] [-j {SHORT|LONG}] [-B
{NONE|SERVICE_TIME|THROUGHPUT}] [-e {NONE|SESSION|SELECT}] [-m
{NONE|BASIC}] [-z <integer>] [-w <integer>]
-d <db_unique_name> Unique name for the database
-s <service> Service name
-c {UNIFORM | SINGLETON} Service runs on every active server in the server
pool hosting this service (UNIFORM) or just one server (SINGLETON)
-P {NONE | BASIC | PRECONNECT} TAF policy specification
-l <role> Role of the service (primary, physical_standby,
logical_standby, snapshot_standby)
-y <policy> Management policy for the service (AUTOMATIC or MANUAL)
-e <Failover type> Failover type (NONE, SESSION, or SELECT)
-m <Failover method> Failover method (NONE or BASIC)
-w <integer> Failover delay
-z <integer> Failover retries
-j <clb_goal> Connection Load Balancing Goal (SHORT or LONG). Default is LONG.
-B <Runtime Load Balancing Goal> Runtime Load Balancing Goal (SERVICE_TIME,
THROUGHPUT, or NONE)
-x <Distributed Transaction Processing> Distributed Transaction Processing (TRUE or FALSE)
-q <AQ HA notifications> AQ HA notifications
(TRUE or FALSE)
-h Print usage
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