目前很多生產(chǎn)數(shù)據(jù)庫都是兩節(jié)點(diǎn)RAC，應(yīng)用連接的數(shù)據(jù)庫通常會(huì)連接SCAN IP或者VIP,這里做一個(gè)小實(shí)驗(yàn)，如果我們使用VIP連接，

應(yīng)該怎樣配置我們的客戶端，負(fù)載均衡是否是嚴(yán)格意義上的輪訓(xùn)機(jī)制，只有通過自己的測試才能得到準(zhǔn)備的答案。

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.測試腳本如下

<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.開始測試，觀察

<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

本文轉(zhuǎn)自 roidba 51CTO博客，原文鏈接：http://blog.51cto.com/roidba/2044144，如需轉(zhuǎn)載請自行聯(lián)系原作者

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