Thursday, January 19, 2012

DataGuard Broker configuration backup

Some time ago I have seen question on oracle-l list about DataGuard Broker configuration backup. There was no clear answer and there were some suggestions to use "dgmgrl" and perl script to display and parse output. This topic was very interesting for me and I decided to dig deeper and find out how Oracle is keeping these information. 
First step was to figure out how DataGuard Broker is gathering that data. You can enable debug option for dgmgrl tool and check how it works
piorovm$ dgmgrl -xml -debug
DGMGRL for Linux: Version 11.2.0.2.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
DGMGRL> connect /
[W000 01/19 11:44:50.82] Connecting to database using .
[W000 01/19 11:44:50.84] Checking broker version [BEGIN :version := dbms_drs.dg_broker_info('VERSION'); END;].
[W000 01/19 11:44:50.84] Broker version is '11.2.0.2.0'
Connected.
DGMGRL>
As you can see there is a dbms_drs package which is used for that.I have checked what I could find in package definition file ( dbmsdrs.sql ) and it was it. There are two examples for blocking and non-blocking queries. Last thing to figure out was to find a XML based command I can use with dbms_drs package to get configuration.
DGMGRL> show configuration verbose;
<do_monitor version="11.2"><verify level="minor" object_id="4096"> </verify>
</do_monitor>
And then step after step I crated script showed below - displayconfig.sql

In 11.2 Oracle add new internal table X$DRC and it can be used to quick check of DataGuard Configuration. Object_id column can be decoded using following rules:
- bit 12 - object_id = 4096 - configuration
- bit 16 - object_id = 65536 - database (probably first database in site)
- bit 24 - object_id = 16777216 - first site
- bit 25 - object_id = 33554432 - second site

First database in first site will have following object_id = 16777216 + 65536 = 16842752.

SQL> set pagesize 1000
SQL> column value format a100
SQL> set linesize 200
SQL> select  attribute, object_id, utl_raw.cast_to_varchar2(hextoraw(value_raw)) value FROM x$drc;

ATTRIBUTE                       OBJECT_ID VALUE
------------------------------ ---------- ----------------------
DRC                                  4096 fsf
intended_state                       4096 ONLINE
protection_mode                      4096 MaxAvailability
enabled                              4096 YES
fast_start_failover                  4096 ENABLED
observer_info                        4096 client.local
fsfo_target                          4096 testdg_b
SITE                             16777216 testdg_a
DATABASE                         16842752 testdg_a
intended_state                   16842752 READ-WRITE-XPTON
connect_string                   16842752 testdg_a.local
RAC                              16842752 NO
enabled                          16842752 YES
role                             16842752 PRIMARY
INSTANCE                         16842753 testdg
SITE                             33554432 testdg_b
DATABASE                         33619968 testdg_b
intended_state                   33619968 PHYSICAL-APPLY-ON
connect_string                   33619968 testdg_b.local
RAC                              33619968 NO
enabled                          33619968 YES
role                             33619968 PHYSICAL
INSTANCE                         33619969 testdg
Disclaimer:
I have tested that script with 11.1 and 11.2 on Linux with simple primary / standby configuration and with RAC primary. Please check this script first on your test environment before you will run it on production configuration.

regards,
Marcin
displayconfig.sql:
set serveroutput on
set linesize 200
declare
rid integer;
indoc varchar2(4000);
outdoc varchar2(4000);
p integer;
z XMLType;
y clob;
v_xml xmltype;
tout varchar2(4000);
begin
    indoc:='<DO_CONFIGURE_DRC><ENUM_DRC/></DO_CONFIGURE_DRC>';
    y := null;
    rid :=dbms_drs.do_control(indoc);

    outdoc :=NULL;
    p:=1;
    while (outdoc is null)
    loop
       outdoc:=dbms_drs.get_response(rid,p);
       y := y || to_clob(outdoc);
    end loop;

    begin
    while (outdoc is not NULL)
    loop
       p:=p+1;
   
       outdoc:=dbms_drs.get_response(rid,p);
       y := y || to_clob(outdoc);
       
    end loop;
    exception
    when no_data_found then
        NULL;
    end;
    z := XMLType(y);

dbms_drs.delete_request(rid);    
    
for l in (select name , role, id, connectdb from XMLTABLE('/DRC/SITE/DATABASE' passing z COLUMNS name PATH '/DATABASE/@name', role PATH '/DATABASE/@role', id PATH '/DATABASE/@id', connectdb PATH '/DATABASE/@connect') )
 loop
    if (l.role = 'PRIMARY') then
        outdoc := 'create configuration DGCONF as primary database is ''' || l.name || ''' connect identifier is ' || l.connectdb || ';';
        dbms_output.put_line(outdoc);
    else
        outdoc := 'add database ''' || l.name || ''' as connect identifier is ' || l.connectdb || ';';
        dbms_output.put_line(outdoc);
    end if;
    
    indoc:='<DO_CONFIGURE_SITE version="11.2"><GET_RESOURCE res_id="' || l.id || '"/></DO_CONFIGURE_SITE>';
    y := null;
    rid :=dbms_drs.do_control(indoc);

    outdoc :=NULL;
    p:=1;
    while (outdoc is null)
    loop
       outdoc:=dbms_drs.get_response(rid,p);
       y := y || to_clob(outdoc);
    end loop;

    begin
    while (outdoc is not NULL)
    loop
       p:=p+1;
   
       outdoc:=dbms_drs.get_response(rid,p);
       y := y || to_clob(outdoc);
       
    end loop;
    exception
    when no_data_found then
        NULL;
    end;
    z := XMLType(y);
   
    select XMLQuery('/RESOURCE/PROPERTY_LIST/VALUE' passing z returning content) into v_xml from dual;
   
   
    for q in (select name , value , property_type as r from
           XMLTABLE('/VALUE' passing v_xml COLUMNS name PATH '/VALUE/@name', value PATH '/VALUE/@value', property_type PATH '/VALUE/@property_type' )
           where value is not null and name in
           ('AlternateLocation','ApplyInstanceTimeout','ApplyParallel','ArchiveLagTarget','Binding','BystandersFollowRoleChange','CommunicationTimeout',
           'DbFileNameConvert','DelayMins','DGConnectIdentifier','FastStartFailoverAutoReinstate','FastStartFailoverLagLimit','FastStartFailoverPmyShutdown',
           'FastStartFailoverTarget','FastStartFailoverThreshold','LogArchiveFormat','LogArchiveMaxProcesses','LogArchiveMinSucceedDest','LogArchiveTrace',
           'LogFileNameConvert','LogShipping','LogXptMode','LsbyASkipCfgPr','LsbyASkipErrorCfgPr','LsbyASkipTxnCfgPr','LsbyDSkipCfgPr','LsbyDSkipErrorCfgPr','LsbyDSkipTxnCfgPr',
           'LsbyMaxEventsRecorded','LsbyMaxSga','LsbyMaxServers','LsbyPreserveCommitOrder','LsbyRecordAppliedDdl','LsbyRecordSkipDdl','LsbyRecordSkipErrors','MaxConnections',
           'MaxFailure','NetTimeout','ObserverConnectIdentifier','PreferredApplyInstance','RedoCompression','ReopenSecs','StandbyArchiveLocation','StandbyFileManagement'
           ))
           loop
       dbms_output.put_line('edit database ' || l.name || ' set property ''' || q.name || ''' = ''' || q.value || ''';' );
    end loop;
    dbms_drs.delete_request(rid);
   
end loop;    
end;
/

6 comments:

Joe Testa said...

The only thing missing it to pull the correct configuration name instead of hardcoding DGCONF.

Marcin Przepiorowski said...

Thanks for comment - I will try to fix it in free time.

Marcin

Tanja Injac said...

Thanks for this very handy script.
Tanja

Tanja Injac said...

Thanks for this handy script!

Ruslan Dautkhanov said...

+1 for the script.

ps. Before I found this page, was looking at the broker config file and found this
> strings dr1.dat | grep "fine folks"
Brought to you by the fine folks at NEDC.
I guess somebody at Oracle also has a sense of humor :) 11.2.0.3 AIX

Anonymous said...

very nice.... we used it for backing up DG config before major upgrades