data guard observer das unbekannte wesen

Data Guard Observer das unbekannte WesenAutor: Ernst Leber19.11.2015 DOAG Nürnberg

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| Data Guard Observer das unbekannte Wesen

Data Guard Observer das unbekannte WesenAgenda

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Data Guard • Übersicht • Konfiguration

Observer • Konfiguration • User Defined Conditions • V$Views • Live Demo

Links

Mit diesem Text werden Terminal Outputs dargestellt


Data Guard Observer das unbekannte WesenData Guard Konfiguration

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ORLCA Database 11.2.0.4

ORCLB Database 11.2.0.4

DGMGRL> show configuration;

Configuration - orcl

Protection Mode: MaxAvailability Databases: orcla - Primary database orclb - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status: SUCCESS


Data Guard Observer das unbekannte WesenData Guard Configuration

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DGMGRL> show database verbose oracle

Database - orclb

Role: PHYSICAL STANDBY Intended State: APPLY-ON Transport Lag: 0 seconds (computed 0 seconds ago) Apply Lag: 0 seconds (computed 0 seconds ago) Apply Rate: 0 Byte/s Real Time Query: OFF Instance(s): orcl

Database Status: SUCCESS



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Properties: DGConnectIdentifier = 'stby' ObserverConnectIdentifier = '' LogXptMode = 'SYNC' DelayMins = '0' Binding = 'optional' MaxFailure = '0' MaxConnections = '1' ReopenSecs = '300' NetTimeout = '30' RedoCompression = 'DISABLE' LogShipping = 'ON' PreferredApplyInstance = '' ApplyInstanceTimeout = '0' ApplyParallel = 'AUTO' StandbyFileManagement = 'AUTO' ArchiveLagTarget = '1800' LogArchiveMaxProcesses = '4' LogArchiveMinSucceedDest = '1' DbFileNameConvert = '' LogFileNameConvert = '' FastStartFailoverTarget = 'orcla'



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InconsistentProperties = '(monitor)' InconsistentLogXptProps = '(monitor)' SendQEntries = '(monitor)' LogXptStatus = '(monitor)' RecvQEntries = '(monitor)' ApplyLagThreshold = '0' TransportLagThreshold = '0' TransportDisconnectedThreshold = '30' SidName = 'orcl' StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oel6-prim)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCLA)(INSTANCE_NAME=orcl)(SERVER=DEDICATED)))' StandbyArchiveLocation = 'USE_DB_RECOVERY_FILE_DEST' AlternateLocation = '' LogArchiveTrace = '0' LogArchiveFormat = '%t_%s_%r.dbf' TopWaitEvents = '(monitor)'


Data Guard Observer das unbekannte WesenData Guard

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LSP: Logical Standby Process SQL Apply for logical DataguardMRP: Managed Recover Process DataGuardRFS: Remote Fileserver Kriegt REDO Daten und schreibt die in die Standby


Data Guard Observer das unbekannte WesenData Guard at Work

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select process,pid,status,client_process, thread#,sequence#,block# from v$managed_standby;


Data Guard Observer das unbekannte WesenObserver Konfiguration

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ORCLA Database 11.2.0.4


Observer 12.1.0.2

tnsnames.ora


Data Guard Observer das unbekannte WesenObserver

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• Eigener Server • DB Version >= Datenbankversion

• Laufender Data Guard Broker

• Switch Over / Failover • Standby und Observer keine Verbindung zu Primary • User defined Condition erfüllt • Shutdown abort der Primary

• Kein automatischer Switch Back

• Automatisches Reinstate • Nicht nach User Defined Conditions

• Empfehlung: sys Username und Password im Wallet


Data Guard Observer das unbekannte Wesentnsnames.ora

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Data Guard Observer das unbekannte WesenObserver Konfiguration Data Guard

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DGMGRL > connect sys@prim

DGMGRL > edit database orcla set property 'LogXptMode'='SYNC';

DGMGRL > edit database orclb set property 'LogXptMode'='SYNC';

DGMGRL > edit database orcla set property 'FastStartFailoverTarget'='stby';

DGMGRL > edit database orclb set property 'FastStartFailoverTarget'='prim';

DGMGRL > edit database orcla set property 'StandbyFileManagement'='AUTO';

DGMGRL > edit database orclb set property 'StandbyFileManagement'='AUTO';


Data Guard Observer das unbekannte WesenDatenbank Konfiguration Data Guard

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Primary:

SQL > alter database flashback on; SQL > alter system set undo_retention=3600 scope=spfile;

Standby:

DGMGRL > edit database orclb set state='APPLY-OFF';

SQL > alter database flashback on; SQL > alter system set undo_retention=3600 scope=spfile;

DGMGRL > edit database orclb set state='APPLY-ON';


Data Guard Observer das unbekannte WesenObserver Mode aktivieren

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DGMGRL > ENABLE FAST_START FAILOVER;


Configuration - orcl Protection Mode: MaxAvailability Databases: orcla - Primary database Warning: ORA-16819: fast-start failover observer not started orclb - (*) Physical standby database Warning: ORA-16819: fast-start failover observer not started

Fast-Start Failover: ENABLED Configuration Status: WARNING DGMGRL>


Data Guard Observer das unbekannte WesenObserver auf dem eigenen Server Starten

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DGMGRL> connect sys@prim Password: Connected as SYSDBA.

DGMGRL> start observer Observer started

das war's!!

Observer


Data Guard Observer das unbekannte WesenObserver Status I

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DGMGRL> show configuration verbose;


Protection Mode: MaxAvailability Databases: orcla - Primary database orclb - (*) Physical standby database

(*) Fast-Start Failover target

orcla


Data Guard Observer das unbekannte WesenObserver Status II

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Properties: FastStartFailoverThreshold = '30' OperationTimeout = '30' FastStartFailoverLagLimit = '30' CommunicationTimeout = '180' ObserverReconnect = '0' FastStartFailoverAutoReinstate = 'TRUE' FastStartFailoverPmyShutdown = 'TRUE' BystandersFollowRoleChange = 'ALL' ObserverOverride = 'FALSE' ExternalDestination1 = '' ExternalDestination2 = '' PrimaryLostWriteAction = 'CONTINUE'

• Mehr Details dazu: http://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR3637

orcla

http://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR3637


Data Guard Observer das unbekannte WesenObserver Status III

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Fast-Start Failover: ENABLED

Threshold: 30 seconds Target: orclb Observer: ele-oel7 Lag Limit: 30 seconds (not in use) Shutdown Primary: TRUE Auto-reinstate: TRUE Observer Reconnect: (none) Observer Override: FALSE


DGMGRL>

orcla


Data Guard Observer das unbekannte WesenUser defined Conditions

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DGMGRL> ENABLE FAST_START FAILOVER CONDITION <condition>; DGMGRL> DISABLE FAST_START FAILOVER CONDITION <condition>; DGMGRL> ENABLE FAST_START FAILOVER CONDITION 27102; DGMGRL> DISABLE FAST_START FAILOVER CONDITION "Datafile Offline";

Condition Default

Datafile Offline enabled

Corrupted Controlfile enabled

Corrupted Dictionary enabled

Inaccessible Logfile disabled

Stuck Archiver disabled

Error Code disabled

orcla


Data Guard Observer das unbekannte WesenUser defined Conditions anzeigen

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DGMGRL> show fast_start failover;

Fast-Start Failover: ENABLED Threshold: 30 seconds Target: orclb Observer: ele-oel7 Lag Limit: 30 seconds (not in use) Shutdown Primary: TRUE Auto-reinstate: TRUE Observer Reconnect: (none) Observer Override: FALSE

Configurable Failover Conditions Health Conditions: Corrupted Controlfile YES Corrupted Dictionary YES Inaccessible Logfile NO Stuck Archiver NO Datafile Offline YES Oracle Error Conditions: ORA-01422: exact fetch returns more than requested number of rows

orcla


Data Guard Observer das unbekannte WesenData Guard Set Delay

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DGMGRL> edit database orclb set property DelayMins=15;

Im Logfile der Standby DB:

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE THROUGH ALL SWITCHOVER DISCONNECT USING CURRENT LOGFILE ……… ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL MRP0: Background Media Recovery cancelled with status 16037 …… MRP0: Background Media Recovery process shutdown (orcl) Managed Standby Recovery Canceled (orcl) Completed: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL ALTER DATABASE RECOVER MANAGED STANDBY DATABASE THROUGH ALL SWITCHOVER DISCONNECT Attempt to start background Managed Standby Recovery process (orcl) Mon Aug 31 12:48:22 2015 MRP0 started with pid=30, OS id=5937 MRP0: Background Managed Standby Recovery process started (orcl) ……… All non-current ORLs have been archived. Media Recovery Waiting for thread 1 sequence 24 (in transit) Completed: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE THROUGH ALL SWITCHOVER DISCONNECT

orcla


Data Guard Observer das unbekannte WesenDOKU: Protection Mode

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• Maximum Availability • This protection mode provides the highest level of data protection that is

possible without compromising the availability of a primary database. REDO is written sync.

• Maximum Performance • This protection mode provides the highest level of data protection that is

possible without affecting the performance of a primary database. Default Mode. Redo is written async

• Maximum Protection • This protection mode ensures that no data loss will occur if the primary

database fails. • Fast Start Failover kann nicht aktiviert werden!

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ORCLA Database 11.2.0.4


Observer 12.1.0.2

tnsnames.ora

Data Guard Observer das unbekannte Wesen

Data Guard Observer das unbekannte WesenKill pmon

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Data Guard Observer das unbekannte WesenObserver Tests

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Kill pmon auf primary!

Observer Log:

14:10:29.09 Sunday, August 02, 2015 Initiating Fast-Start Failover to database "orclb"... Performing failover NOW, please wait... Failover succeeded, new primary is "orclb" 14:10:31.81 Sunday, August 02, 2015

Oberver



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Starten der DB auf ORCLA: SQL*Plus: Release 11.2.0.4.0 Production on Sat Aug 1 19:37:49 2015

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to an idle instance.

SQL> startup ORACLE instance started.

Total System Global Area 1787138048 bytes Fixed Size 2254104 bytes Variable Size 486542056 bytes Database Buffers 1291845632 bytes Redo Buffers 6496256 bytes Database mounted. ORA-16649: possible failover to another database prevents this database from being opened

orcla



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Observer Log-file:

14:12:17.45 Sunday, August 02, 2015 Initiating reinstatement for database "orcla"... Reinstating database "orcla", please wait... Operation requires shut down of instance "orcl" on database "orcla" Shutting down instance "orcl"... ORA-01109: database not open

Database dismounted. ORACLE instance shut down. Operation requires start up of instance "orcl" on database "orcla" Starting instance "orcl"... ORACLE instance started. Database mounted. Continuing to reinstate database "orcla" ... Reinstatement of database "orcla" succeeded 14:13:12.22 Sunday, August 02, 2015

Oberver



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DGMGRL > show configuration;


Protection Mode: MaxAvailability Databases: orclb - Primary database orcla - (*) Physical standby database



orclb



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SQL > shutdown abort;

Observer Output: 13:58:35.65 Sunday, August 30, 2015 Initiating Fast-Start Failover to database "orcla"... Performing failover NOW, please wait... Failover succeeded, new primary is "orcla" 13:58:38.15 Sunday, August 30, 2015

startup mount;

orclb



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Observer Output:

14:01:11.00 Sunday, August 30, 2015 Initiating reinstatement for database "orclb"... Reinstating database "orclb", please wait... Operation requires shut down of instance "orcl" on database "orclb" Shutting down instance "orcl"... ORA-01109: database not open

Database dismounted. ORACLE instance shut down. Operation requires start up of instance "orcl" on database "orclb" Starting instance "orcl"... ORACLE instance started. Database mounted. Continuing to reinstate database "orclb" ... Reinstatement of database "orclb" succeeded 14:02:03.63 Sunday, August 30, 2015

Oberver



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Protection Mode: MaxAvailability Databases: orcla - Primary database orclb - (*) Physical standby database



DGMGRL>

orclb


Data Guard Observer das unbekannte WesenObserver Tests User Defined Condition

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DGMGRL> ENABLE FAST_START FAILOVER CONDITION 1422; SQL> create table tab1 (col1 number); SQL> insert into tab1 values(1); SQL> insert into tab1 values(1); SQL> insert into tab1 values(1); SQL> insert into tab1 values(1); SQL> Commit; SQL> DECLARE SQL> v_col1 number; SQL> BEGIN SQL> select col1 into v_col1 from tab1; SQL> END SQL> /

orcla


Data Guard Observer das unbekannte WesenObserver Tests User Defined Condition

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alert_prim.log:

Fri Sep 18 14:08:24 2015 Fore: user-configured ORA-1422 requesting FSFO Fri Sep 18 14:08:35 2015 A user-configurable Fast-Start Failover condition was detected. The primary is shutting down due to ORA-01422: exact fetch returns more than requested number of rows. Database ORCLA will not be automatically reinstated.

orcla


Data Guard Observer das unbekannte WesenFailover mit DBMS_DG

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Beispielprogramm dazu:

set serveroutput on

declarestatus integer;beginstatus := dbms_dg.initiate_fs_failover('Failover Requested');

dbms_output.put_line('Fast-Start Failover is disabled: Expected status = ORA-16646');dbms_output.put_line(' Actual Status = ORA-' || status);

end;/exit;

orcla


Data Guard Observer das unbekannte WesenV$Views

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• v$managed_standbyStatus Information der Physical Standby Datenbank

• v$fs_failover_statsInformationen über Fast Start Failover (FSFO)

• v$fs_observer_histogramPing Statistiken, diese Tabelle kann für das Setzen von FastStartFailoverThreshold genutzt werden


Data Guard Observer das unbekannte WesenLinks

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• Data Guard Broker • docs.oracle.com/cd/E11882_01/server.112/e40771/toc.htm

• Properties • http://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR3637

• Data Guard Concepts and Administration • docs.oracle.com/cd/E11882_01/server.112/e41134/toc.htm

• DBMS_DG Package • https://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_dg.htm#ARPLS920

• dgmgrl Syntax • http://docs.oracle.com/cd/B28359_01/server.111/b28295/dgmgrl.htm

http://docs.oracle.com/cd/E11882_01/server.112/e40771/toc.htm

http://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR3637

http://docs.oracle.com/cd/E11882_01/server.112/e41134/toc.htm

http://docs.oracle.com/cd/B28359_01/server.111/b28295/dgmgrl.htm


Data Guard Observer das unbekannte Wesen

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Ernst Leber38

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data guard observer das unbekannte wesen

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