Oracle 12c应用连接VIP轮训负载均衡？

目前很多生产数据库都是两节点RAC，应用连接的数据库通常会连接SCAN IP或者VIP,这里做一个小实验，如果我们使用VIP连接，

应该怎样配置我们的客户端，负载均衡是否是严格意义上的轮训机制，只有通过自己的测试才能得到准备的答案。

1. tnsnames.ora配置

<rac01:orcl1:/u01/app/oracle/product/12.1.0/dbhome_1/network/admin>$less tnsnames.ora 

# tnsnames.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/tnsnames.ora

# Generated by Oracle configuration tools.

orcl =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = rac-scan)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = orcl)

    )

  )

vip =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.203)(PORT = 1521))

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.204)(PORT = 1521))

    (LOAD_BALANCE = yes) 

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = orcl)

    )

  )

2.测试脚本如下

<rac01:orcl1:/u01/app/oracle/product/12.1.0/dbhome_1/network/admin>$

<rac01:orcl1:/u01/app/oracle/product/12.1.0/dbhome_1/network/admin>$less load_balance.sh 

#!/bin/bash  

for i in {1..100}  

do  

echo $i

sqlplus -S system/oracle@vip <<EOF

select instance_name from v\$instance;

select count(*) from t1;

EOF

sleep 1  

done  

exit 0 

3.开始测试，观察

<rac01:orcl1:/u01/app/oracle/product/12.1.0/dbhome_1/network/admin>$sh load_balance.sh 

1

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

2

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

3

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

4

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

5

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

6

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

7

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

8

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

9

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

10

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

11

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

12

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

13

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

14

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

15

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

16

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

17

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

18

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

19

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

20

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

21

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

22

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

23

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

24

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

25

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

26

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

27

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

28

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

29

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

30

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

31

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

32

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

33

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

34

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

35

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

36

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

37

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

38

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

39

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

40

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

41

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

42

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

43

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

44

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

45

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

46

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

47

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

48

INSTANCE_NAME

----------------

orcl2

  COUNT(*)

----------

   2910624

49

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

50

INSTANCE_N

....省略...............

  COUNT(*)

----------

   2910624

100

INSTANCE_NAME

----------------

orcl1

  COUNT(*)

----------

   2910624

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