- 一个准客户在做一个系统的性能测试，前面打电话聊过，他从metalink，bbs等了解到rac的insert 比单节点性能低，并希望能协助调整。
- 首先感觉他的思路有问题， 对一个系统的性能测试，应该用专门的压力测试工具，用TPC指标进行测试，看能否达到应用的需求。对单独的insert等操作，有什么说服力呢？
- 根据他的要求， 对rac（连接到某个节点）， 单节点（cluster_database=false)分别进行插入20000条记录测试（1.sql,内容见下面）， 用set timing on 记录执行时间。 测试发现，2个时间基本是一样的。详细情况参看下面的测试记录
- 后来，使用swingbench进行压力测试。因为2个node配置差别很大，一个2cpu，4GRAM（node1），一个4cpu, 8GRAM (node2) ,负载均衡时， 一个node已经满复合，另外一个还只有20％，总不能达到整个系统的峰值。后修改客户端的tnsnames.ora （见下面附录），在ADDRESS列表中增加2个node2,负载均衡时， node2将得到3/4的连接， 压力也增加3/4, 这样测试，基本达到了系统的峰值。
l single node.
$ sqlplus cqtest/cqtest
SQL*Plus: Release
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release
With the Partitioning, Real Application Clusters, OLAP and Oracle Data Mining options
JServer Release
SQL> set time on
11:31:03 SQL> set timing on
11:31:05 SQL> alter session set events '10046 trace name context forever, level 12';
Session altered.
Elapsed: 00:00:00.00
11:32:05 SQL> @1
11:32:07 2 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:07.69
11:32:16 SQL> alter session set events '10046 trace name context off';
Session altered.
Elapsed: 00:00:00.00
11:32:30 SQL>
l rac
11:34:13 SQL> conn cqtest/cqtest
Connected.
11:34:47 SQL> truncate table free_item_no;
Table truncated.
Elapsed: 00:00:00.35
11:34:56 SQL> alter session set events '10046 trace name context forever, level 12';
Session altered.
Elapsed: 00:00:00.01
11:35:12 SQL> @1
11:35:15 2 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:07.98
11:35:24 SQL> alter session set events '10046 trace name context off';
Session altered.
Elapsed: 00:00:00.00
11:35:34 SQL>
可见，时间基本一样。
后又在vmware-linux的rac (10.2.0.1)上测试， 测试结果：
linux-rac
l rac
SQL> conn lyf/lyf
Connected.
SQL> create table te1 (id number);
Table created.
SQL> alter session set events '10046 trace name context forever, level 12';
Session altered.
SQL> set timing on
SQL> set time on
01:32:23 SQL> begin for no in 1..20000 loop insert into te1 values (no*11); end loop; commit;end;
01:32:35 2 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:04.49
01:32:41 SQL> alter session set events '10046 trace name context off';
Session altered.
Elapsed: 00:00:00.01
01:33:12 SQL>
l node
SQL> conn lyf/lyf
Connected.
SQL> set timing on
SQL> alter session set events '10046 trace name context forever, level 12';
Session altered.
Elapsed: 00:00:00.02
SQL> begin for no in 1..20000 loop insert into te1 values (no*11); end loop; commit;end;
2 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:04.73
SQL> alter session set events '10046 trace name context off';
Session altered.
这里，node比rac时间还长。
通过2个平台， 2个版本比较， 感觉rac和单节点在insert上速度可以认为基本一样。
tnsnames.ora
ORCLnew =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.102)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.102)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.102)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.101)(PORT = 1521))
(LOAD_BALANCE = yes)
(FAILOVER = on)
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
(FAILOVER_MODE=
(TYPE=session)
(METHOD=basic)
)
)
)
1.sql
begin for no in 1..20000 loop insert into te1 values (no*11); end loop;
--------