[DataGuard] seamless handover of physical DG configuration client (8.3) -- client TAF configuration

2021-04-08 10:42:38

dataguard seamless handover physical dg

One .1 BLOG Document structure chart

wpsA722.tmp[4]

One .2 Preface

One .2.1 Reading guide

Technology enthusiasts , After reading this article , You can master the following skills , You can also learn something else you don't know ,~O(∩_∩)O~：

① Data Guard Broker Configuration of

② Fast-Start Failover Configuration of

③ Oracle DataGuard Client of TAF To configure

④ Use DGMGRL To manage the database

⑤ Physics dg Management and maintenance of some sql

⑥ DataGuard Client special configuration

Be careful ： This article BLOG I use yellow background and red font to show the places that need special attention in the code part of , For example, in the following example ,thread 1 The maximum archive log number for is 33,thread 2 The maximum archive log number for is 43 It's something that needs special attention .

List of Archived Logs in backup set 11

Thrd Seq Low SCN Low Time Next SCN Next Time

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

1 32 1621589 2015-05-29 11:09:52 1625242 2015-05-29 11:15:48

1 33 1625242 2015-05-29 11:15:48 1625293 2015-05-29 11:15:58

2 42 1613951 2015-05-29 10:41:18 1625245 2015-05-29 11:15:49

2 43 1625245 2015-05-29 11:15:49 1625253 2015-05-29 11:15:53

If there are any mistakes or imperfections in this article, please correct them ,ITPUB Message or QQ All can , Your criticism is the biggest motivation of my writing .

One .2.2 Introduction to the experimental environment

project	Main library	dg library
db type	Single instance	Single instance
db version	11.2.0.3	11.2.0.3
db Storage	FS type	FS type
ORACLE_SID	oradg11g	oradgphy
db_name	oradg11g	oradg11g
host IP Address ：	192.168.59.130	192.168.59.130
OS Version and kernel edition	RHEL6.5 64 position ,2.6.32-504.16.2.el6.x86_64	RHEL6.5 64 position ,2.6.32-504.16.2.el6.x86_64
OS hostname	rhel6_lhr	rhel6_lhr

One .2.3 Links to related reference articles

dg A series of articles ：

【DATAGUARD】 Establish physical backup and logical backup based on the same host （ One ）： http://blog.itpub.net/26736162/viewspace-1448197/
【DATAGUARD】 Establish physical backup and logical backup based on the same host （ Two ): http://blog.itpub.net/26736162/viewspace-1448207/
【DATAGUARD】 Establish physical backup and logical backup based on the same host （ 3、 ... and ): http://blog.itpub.net/26736162/viewspace-1481972/
【DATAGUARD】 Establish physical backup and logical backup based on the same host ( Four )-- Add a physical dg node ：http://blog.itpub.net/26736162/viewspace-1484878/

【DATAGUARD】 Physics dg Of switchover Switch （ 5、 ... and ）：http://blog.itpub.net/26736162/viewspace-1753111/

【DATAGUARD】 Physics dg Of failover Switch ( 6、 ... and )： http://blog.itpub.net/26736162/viewspace-1753130/

【DATAGUARD】 Physics dg Recovery in the case of lost archive files in the main library ( 7、 ... and ) ： http://blog.itpub.net/26736162/viewspace-1780863/

【DATAGUARD】 Physics dg Configure client seamless switching ( 8、 ... and .1)--Data Guard Broker Configuration of :http://blog.itpub.net/26736162/viewspace-1811839/

【DATAGUARD】 Physics dg Configure client seamless switching ( 8、 ... and .2)--Fast-Start Failover Configuration of ：http://blog.itpub.net/26736162/viewspace-1811936/

【DATAGUARD】 Physics dg Configure client seamless switching ( 8、 ... and .3)-- client TAF To configure ：http://blog.itpub.net/26736162/viewspace-1811944/

【DATAGUARD】 Physics dg Configure client seamless switching ( 8、 ... and .4)--ora-16652 and ora-16603 error :http://blog.itpub.net/26736162/viewspace-1811947/

One .2.4 Brief introduction

This article blog Is based on cuug The content of the open class , I do the practical operation myself , Video can refer to ：http://blog.itpub.net/26736162/viewspace-1624453/ , I won't write more about it , hold cuug The content is direct copy Come here , I think it's more useful .

This technology, if you don't know , It's not ORACLE master

This technology, if you don't know , You can't say that you will DataGuard

This technology, if you don't know ,......

This online course , When the primary and standby databases are switched , How to start a service, Ensure that the client connection can continue , And it can continue select Query operation , No matter which server the primary and secondary libraries are on ; At the same time to ensure that the new customer connection without any problems . There are not many examples on the Internet of this course , Mr. Chen spent nearly a year searching for human flesh , Just recently , I can't wait to share it with you .

1、DataGuard Configuration of （ Fast ）

2、 establish service

3、 Create trigger

4、 Active / standby database switching test

Because there is so much , I'm going to divide it into 4 This is a chapter to share with you , Paste a picture , Don't strange , There is also a chapter on how to solve the problems in the experiment .

wpsA723.tmp[4]

This is the second section ,Fast-Start Failover Configuration of .

One .3 Experimental part

One .3.1 The goal of the experiment

complete Oracle DataGuard Client of TAF To configure , And test seamless switching .

One .3.2 client TAF To configure

One .3.2.1 First, configure a TAF Of service

This service will send a notification to the client when the database fails , Allow query statements to continue running after a failover .

Run on the main library side ：

14:51:45 SQL> begin

14:52:10 2 DBMS_SERVICE.CREATE_SERVICE(service_name => 'dg_taf_lhr',

14:52:10 3 network_name => 'dg_taf_lhr',

14:52:10 4 aq_ha_notifications => TRUE,

14:52:10 5 failover_method => 'BASIC',

14:52:10 6 failover_type => 'SELECT',

14:52:10 7 failover_retries => 30,

14:52:10 8 failover_delay => 5);

14:52:10 9 end;

14:52:10 10 /

PL/SQL Process completed successfully .

Elapsed time : 00: 00: 00.07

14:52:10 SQL>

One .3.2.2 Set up a stored procedure , Used to invoke service, Make sure to run only in the main library

We create a stored procedure to do this , If the current database is the master, it starts the service , If it's a standby library, stop .

Main library execution ：

14:54:58 SQL> create or replace procedure dg_taf_proc_lhr is

14:59:46 2 v_role VARCHAR(30);

14:59:46 3 begin

14:59:46 4 select DATABASE_ROLE into v_role from V$DATABASE;

14:59:46 5 if v_role = 'PRIMARY' then

14:59:46 6 DBMS_SERVICE.START_SERVICE('dg_taf_lhr');

14:59:46 7 else

14:59:46 8 DBMS_SERVICE.STOP_SERVICE('dg_taf_lhr');

14:59:46 9 end if;

14:59:46 10 end;

14:59:46 11 /

Process created .

Elapsed time : 00: 00: 00.07

One .3.2.3 establish 1 A trigger to ensure that the service can run

Create two triggers , Let the database run this stored procedure during startup and role transition . Used as a database open when , No need to restart the database , If it's the main library, execute the stored procedure . When the database switches , If it's the main library, execute the stored procedure .

Main library execution ：

14:59:47 SQL> create or replace TRIGGER dg_taf_trg_startup_lhr

14:59:53 2 after startup or db_role_change on database

14:59:53 3 begin

14:59:53 4 dg_taf_proc_lhr;

14:59:53 5 end;

14:59:53 6 /

Trigger created

Elapsed time : 00: 00: 00.26

14:59:54 SQL>

One .3.2.4 Start the newly created service

Execute the stored procedure on the main library ( Or restart the database , Execution is triggered when the database is started dg_taf_proc The trigger of ), Switch logs in the main database , Apply the changes to the standby Library

Main library execution ：

14:59:54 SQL> exec dg_taf_proc_lhr ;

PL/SQL Process completed successfully .

Elapsed time : 00: 00: 00.01

15:06:57 SQL> alter system switch logfile;

The system has changed .

Elapsed time : 00: 00: 01.02

15:20:01 SQL>

[oracle@rhel6_lhr ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 29-9 month -2015 15:07:32

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.59.130)(PORT=1521)))

LISTENER Of STATUS

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

Alias LISTENER

edition TNSLSNR for Linux: Version 11.2.0.3.0 - Production

Start date 29-9 month -2015 12:14:49

Normal operation time 0 God 2 Hours 52 branch 43 second

Tracking level off

Security ON: Local OS Authentication

SNMP OFF

Listener parameter file /u01/app/grid/11.2.0/network/admin/listener.ora

Listening endpoint profile ...

(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.59.130)(PORT=1521)))

Service summary ..

service "+ASM" contain 1 An example .

example "+ASM", state READY, The 1 A handler ...

service "PLSExtProc" contain 1 An example .

example "PLSExtProc", state UNKNOWN, The 1 A handler ...

service "dg_taf_lhr.lhr.com" contain 1 An example .

example "oradg11g", state READY, The 1 A handler ...

service "ora11g" contain 1 An example .

example "ora11g", state UNKNOWN, The 1 A handler ...

service "oradg11g" contain 1 An example .

example "oradg11g", state UNKNOWN, The 1 A handler ...

service "oradg11g.lhr.com" contain 2 An example .

example "oradg11g", state UNKNOWN, The 1 A handler ...

example "oradg11g", state READY, The 1 A handler ...

service "oradg11gXDB.lhr.com" contain 2 An example .

example "oradg11g", state READY, The 1 A handler ...

example "oradgphy", state READY, The 1 A handler ...

service "oradg11g_DGB.lhr.com" contain 1 An example .

example "oradg11g", state READY, The 1 A handler ...

service "oradg11g_DGMGRL.lhr.com" contain 1 An example .

example "oradg11g", state UNKNOWN, The 1 A handler ...

service "oradglg" contain 1 An example .

example "oradglg", state UNKNOWN, The 1 A handler ...

service "oradgphy" contain 1 An example .

example "oradgphy", state UNKNOWN, The 1 A handler ...

service "oradgphy.lhr.com" contain 2 An example .

example "oradgphy", state UNKNOWN, The 1 A handler ...

example "oradgphy", state READY, The 1 A handler ...

service "oradgphy_DGB.lhr.com" contain 1 An example .

example "oradgphy", state READY, The 1 A handler ...

service "oradgphy_DGMGRL.lhr.com" contain 1 An example .

example "oradgphy", state UNKNOWN, The 1 A handler ...

service "oradgss" contain 1 An example .

example "oradgss", state UNKNOWN, The 1 A handler ...

service "orclasm.lhr.com" contain 1 An example .

example "orclasm", state UNKNOWN, The 1 A handler ...

Command executed successfully

One .3.2.5 Query in the backup database , Confirm that the trigger and memory have been applied to the standby database

15:21:21 SQL> select trigger_name, trigger_name

15:22:09 2 from dba_triggers where trigger_name = 'DG_TAF_TRG_STARTUP_LHR';

TRIGGER_NAME TRIGGER_NAME

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

DG_TAF_TRG_STARTUP_LHR DG_TAF_TRG_STARTUP_LHR

Elapsed time : 00: 00: 00.09

15:22:09 SQL>

15:24:28 SQL> select d.owner,d.OBJECT_NAME

15:24:54 2 from dba_procedures d

15:24:54 3 where d.OBJECT_NAME = 'DG_TAF_PROC_LHR';

OWNER OBJECT_NAME

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

SYS DG_TAF_PROC_LHR

Elapsed time : 00: 00: 00.05

15:24:54 SQL>

One .3.2.6 client tnsnames To configure

dg_taf =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = tcp)(HOST = 192.168.59.130)(PORT = 1521))

(LOAD_BALANCE = yes)

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = dg_taf_lhr.lhr.com)

(FAILOVER_MODE =

(TYPE = session)

(METHOD = basic)

(RETRIES = 180)

(DELAY = 5)

)

notes ： my dg Because the environment is deployed on the same machine , therefore host equally , The production environment must be different .

One .3.3 Verify the client's TAF

Let's talk about the testing process first , First of all we have windows Environment tnsnames, then cmd Connect to dg Environmental Science , Execute a long query (select * from (select * from sys.dba_objects);), At this time in dgmgrl Medium manual shutdown abort Drop the main library , So connected cmd There will be a pause in the middle , wait for fast-start failover After switching , Then continue to return the result .

The active / standby switching does not affect the user's select operation , But if it is dml operation , Then all transactions are rolled back ：

D:\Users\xiaomaimiao>sqlplus lhr/lhr@dg_taf

SQL*Plus: Release 11.2.0.1.0 Production on Tue Sep 29 15:37:20 2015

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> set line 9999

SQL> col name format a10

SQL> col FS_FAILOVER_OBSERVER_HOST format a20

SQL> col DB_UNIQUE_NAME format a15

SQL> select dbid,name, DB_UNIQUE_NAME,RESETLOGS_CHANGE#,current_scn,protection_mode,protection_level,database_role,force_logging,open_mode,switchover_status from v$database;

DBID NAME DB_UNIQUE_NAME RESETLOGS_CHANGE# CURRENT_SCN PROTECTION_MODE PROTECTION_LEVEL DATABASE_ROLE FOR OPEN_MODE SWITCHOVER_STATUS

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

1403587593 ORADG11G oradg11g 2575356 2604578 MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY PRIMARY YES READ WRITE TO STANDBY

SQL> SELECT d.DBID,

2 d.DB_UNIQUE_NAME,

3 d.FORCE_LOGGING,

4 d.FLASHBACK_ON,

5 DATAGUARD_BROKER,

6 d.FS_FAILOVER_STATUS,

7 d.FS_FAILOVER_CURRENT_TARGET,

8 d.FS_FAILOVER_THRESHOLD,

9 d.FS_FAILOVER_OBSERVER_PRESENT,

10 d.FS_FAILOVER_OBSERVER_HOST

11 FROM v$database d;

DBID DB_UNIQUE_NAME FOR FLASHBACK_ON DATAGUAR FS_FAILOVER_STATUS FS_FAILOVER_CURRENT_TARGET FS_FAILOVER_THRESHOLD FS_FAIL FS_FAILOVER_OBSERVER

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

1403587593 oradg11g YES YES ENABLED SYNCHRONIZED oradgphy 30 YES rhel6_lhr

SQL>

You can see that it's connected to the main library .

wpsA734.tmp[4]

Cmd Get stuck , wait for observer After switching cmd The interface continues to query ：

15:44:42.75 2015 year 9 month 29 Japan Tuesday

Creating database "oradgphy" Start fast start failover ...

Fail over now , Please wait a moment ...

Fail over succeeded , The new main database is "oradgphy"

15:44:49.93 2015 year 9 month 29 Japan Tuesday

wpsA745.tmp[4]

SQL> set line 9999

SQL> col name format a10

SQL> col FS_FAILOVER_OBSERVER_HOST format a20

SQL> col DB_UNIQUE_NAME format a15

SQL> select dbid,name, DB_UNIQUE_NAME,RESETLOGS_CHANGE#,current_scn,protection_mode,protection_level,database_role,force_logging,open_mode,switchover_status from v$database;

DBID NAME DB_UNIQUE_NAME RESETLOGS_CHANGE# CURRENT_SCN PROTECTION_MODE PROTECTION_LEVEL DATABASE_ROLE FOR OPEN_MODE SWITCHOVER_STATUS

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

1403587593 ORADG11G oradgphy 2605058 2605468 MAXIMUM AVAILABILITY RESYNCHRONIZATION PRIMARY YES READ WRITE NOT ALLOWED

SQL> SELECT d.DBID,

2 d.DB_UNIQUE_NAME,

3 d.FORCE_LOGGING,

4 d.FLASHBACK_ON,

5 DATAGUARD_BROKER,

6 d.FS_FAILOVER_STATUS,

7 d.FS_FAILOVER_CURRENT_TARGET,

8 d.FS_FAILOVER_THRESHOLD,

9 d.FS_FAILOVER_OBSERVER_PRESENT,

10 d.FS_FAILOVER_OBSERVER_HOST

11 FROM v$database d;

DBID DB_UNIQUE_NAME FOR FLASHBACK_ON DATAGUAR FS_FAILOVER_STATUS FS_FAILOVER_CURRENT_TARGET FS_FAILOVER_THRESHOLD FS_FAIL FS_FAILOVER_OBSERVER

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

1403587593 oradgphy YES YES ENABLED REINSTATE REQUIRED oradg11g 30 YES rhel6_lhr

SQL>

After switching , Stored procedure started on standby library TAF Of service , When the client reconnects , Automatically connected to the current main library （ The original library ）.

@ thus , stay DG In the environment of client TAF Configuration is basically complete .

One .3.4 Digression ：Java Configuration in

One .3.4.1 Use tnsnames To configure

Link to the original text ：http://aijuans.iteye.com/blog/1488998

Format 1 : Oracle JDBC Thin using a ServiceName:

jdbc:oracle:thin:@//<host>:<port>/<service_name>
Example: jdbc:oracle:thin:@//192.168.2.1:1521/XE

Notice the format here ,@ In the back //, This is related to the use of SID The main difference .

This format is Oracle Recommended format , Because for clusters , For each node SID It's different , however SERVICE_NAME It does include all nodes .

Format two : Oracle JDBC Thin using an SID:

jdbc:oracle:thin:@<host>:<port>:<SID>
Example: jdbc:oracle:thin:192.168.2.1:1521:X01A

Note: Support for SID is being phased out. Oracle recommends that users switch over to usingservice names.

Format three ：Oracle JDBC Thin using a TNSName:

jdbc:oracle:thin:@<TNSName>
Example: jdbc:oracle:thin:@GL

Note:
Support for TNSNames was added in the driver release 10.2.0.1

Two . test

2.1 preparation ：

Oracle yes 11gR2

Listener.ora

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(GLOBAL_DBNAME = dave)

(ORACLE_HOME =D:\app\Administrator\product\11.2.0\dbhome_1)

(SID_NAME = NEWCCS)

)

Tnsnames.ora

DVD =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = dave)

)

2.3 Use service_name：dave

take 2.2 Chaste dbUrl Changed to the following ：

String dbUrl = "jdbc:oracle:thin:@//127.0.0.1:1521/dave";

Output results ：

MGMT_VIEW--97

ANQING--94

DVD--93

SYSMAN--95

If in 11g The following error was encountered in the ：

test run Java class , Report errors ：

java.sql.SQLException: The Network Adapter could not establish the connection

You can try to replace the corresponding jdbc connection driver, The description on the official website is as follows ：

JDBC Thin Driver 11g Causes"Java.Sql.Sqlexception: Io Exception: The Network Adapter Could NotEstablish The Connection" While Connecting to Oracle Database 11g [ID947653.1]

Change the JDBC connection driver class inyour application server from:

oracle.jdbc.driver.OracleDriver

oracle.jdbc.OracleDriver

2.4 Use TNS name： dvd

String dbUrl = "jdbc:oracle:thin:@dvd";

An error is as follows ：

java.sql.SQLException: Unknown host specified

The problem is that JVM No, oracle.net.tns_admin Of system property. The solution is 2 Kind of ：

Method 1 ： Start up VM Add the following parameters ：

-Doracle.net.tns_admin=D:\app\Administrator\product\11.2.0\dbhome_1\NETWORK\ADMIN
wpsA755.tmp[4]

Method 2 ： stay java Add... To the code ：

System.setProperty("oracle.net.tns_admin","D:\\app\\Administrator\\product\\11.2.0\\dbhome_1\\NETWORK\\ADMIN");

After adding , Can be normal in JDBC Use in tnsnama 了 .

Java Code

1. 2.2 test 1, Use SID:newccs

3. [java] view plaincopy

5. import java.sql.*;

7. public class jdbc {

8. String dbUrl = "jdbc:oracle:thin:@127.0.0.1:1521:newccs";

9. String theUser = "dave";

10. String thePw = "dave";

11. Connection c = null;

12. Statement conn;

13. ResultSet rs = null;

14.

15. public jdbc() {

16. try {

17. Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

18. c = DriverManager.getConnection(dbUrl, theUser, thePw);

19. conn = c.createStatement();

20. } catch (Exception e) {

21. e.printStackTrace();

22. }

23. }

24.

25. public boolean executeUpdate(String sql) {

26. try {

27. conn.executeUpdate(sql);

28. return true;

29. } catch (SQLException e) {

30. e.printStackTrace();

31. return false;

32. }

33. }

34.

35. public ResultSet executeQuery(String sql) {

36. rs = null;

37. try {

38. rs = conn.executeQuery(sql);

39. } catch (SQLException e) {

40. e.printStackTrace();

41. }

42. return rs;

43. }

44.

45. public void close() {

46. try {

47. conn.close();

48. c.close();

49. } catch (Exception e) {

50. e.printStackTrace();

51. }

52. }

53.

54. public static void main(String[] args) {

55. ResultSet rs;

56. jdbc conn = new jdbc();

57. rs = conn.executeQuery("select * from dave where rownum<5");

58. try {

59. while (rs.next()) {

60. System.out.println(rs.getString("username")+"--"+rs.getString("user_id"));

61. }

62. } catch (Exception e) {

63. e.printStackTrace();

64. }

65. }

66. }

67.

68. --- Normal output ：

69. MGMT_VIEW--97

70. ANQING--94

71. DVD--93

72. SYSMAN--95

One .3.4.2 Don't use tnsname

jdbc:oracle:thin:@
(description=
(ADDRESS_LIST =
(address=(protocol=tcp)(host=192.168.1.44)(port=1521))
(address=(protocol=tcp)(host=192.168.1.45)(port=1521))
(address=(protocol=tcp)(host=192.168.1.46)(port=1521))
(load_balance=yes)
)
(connect_data =
(service_name=ORACMS)
(failover_mode =
(type=session)
(method=basic)
(retries=5)
(delay=15)
)
)
)

-- Annotated TNS Connection string
jdbc:oracle:thin:@
(description=
(ADDRESS_LIST =
(address=(protocol=tcp)(host=192.168.1.44)(port=1521))
(address=(protocol=tcp)(host=192.168.1.45)(port=1521))
(address=(protocol=tcp)(host=192.168.1.46)(port=1521))
(load_balance=yes)// Indicates whether the load is balanced
)
(connect_data =
//(server = dedicated)// This parameter represents the dedicated server mode
(service_name=ORACMS)// The name of the service to operate the database
(failover_mode =// How to deal with the connection failure
(type=session)//TYPE =SESSION When an instance of a well connected session fails , The system will automatically switch the session to other available instances , The foreground application does not need to initiate a connection again , But what the session is doing SQL Need to be re executed .
(method=basic)// The initial connection is to connect a pin
(retries=5)// The number of times the connection was retried after the connection failed
(delay=15)// Delay time to try again after connection failure ( In seconds )
)
)
)

One .4 summary

This is the third section , Please check out section 4 ： dgmgrl Common errors in maintenance .

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