Helios's Blog

11g Snapshot Standby for real time testing

Gunes Erol — Thu, 08 Dec 2011 15:03:16 +0000

Sometimes We need to make some test on our database and then We want to revert what We have done on database.

I want to make demo for 11g Snapshot Standby for real time testing. Now let us talk about what I meant deeply
Oracle 11g have one one very good feature which is calling Snapshot Standby database where we can basically convert the physical standby database into a read-write real time production database which we can use that database temporarily for our possible development testing and disaster scenario

Basically, Snapshot Standby database uses the Flashback Database technology to create a guaranteed restore point to which the database can be later flashed back to. So this future give us possibility on work on that database.

Now let use see how we can use this future, here is the my scenario:

I have 11gR2(11.2.0.1) database on AIX 6.1 server which is working as primary database at İstanbul.This database also have physical standby database which run on our disaster center at İzmir(PS: İstabul and İzmir are cities in Turkey(The distance is almost 600 Km.)

What is our purpose? We want to make some test on standby database,thatswhy we want to open that database,working on it than we want to turn normal state as working as before.

Here is the our steps:

1. Check db_recovery parameter on both database(standby&primary)

On primary

SQL> show parameters db_recovery;

NAME                                 TYPE        VALUE
———————————— ———– ——————————
db_recovery_file_dest                     string
db_recovery_file_dest_size           big integer 0

SQL> alter system set db_recovery_file_dest_size=50g scope=both;

Database altered.

SQL> Alter system set db_recovery_file_dest=’+ORAFRA’ scope=both;

Database altered.

SQL> alter database flashback on;

Database altered.

On Standby

SQL> show parameters db_recovery;

SQL> alter system set db_recovery_file_dest_size=50g scope=both;

Database altered.

SQL> Alter system set db_recovery_file_dest=’+ORAFRA’ scope=both;

Database altered.

SQL> select protection_mode, protection_level from v$database;

PROTECTION_MODE PROTECTION_LEVEL
——————– ——————–
MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY

SQL> alter database flashback on;

Database altered.

SQL> alter database recover managed standby database cancel;

Database altered.

SQL> select flashback_on from v$database;

FLASHBACK_ON
——————
YES

On Primary

Now for to can be sure before after state We are creating table on primary.

SQL> create table test_table_on_primary (status varchar2(20),date timestamp);

Table created.

SQL> insert into test_table_on_primary values(‘before snapshot’,sysdate);

1 row created.

SQL> commit;

Commit complete.

SQL> set linesize 1000
SQL> select * from test_table_on_primary

STATUS TARIH
——————– —————————————————————————
before snapshot 23-NOV-11 01.54.48.000000 PM

Now we can keep working on standby database

On Standby

SQL> ALTER DATABASE CONVERT TO SNAPSHOT STANDBY;

Database altered.

SQL> shutdown immediate;
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.

SQL> startup;
ORACLE instance started.

Total System Global Area 3206836224 bytes
Fixed Size                  2211064 bytes
Variable Size            2717909768 bytes
Database Buffers          469762048 bytes
Redo Buffers               16953344 bytes
Database mounted.
Database opened.

SQL> set linesize 1000
SQL> select NAME,GUARANTEE_FLASHBACK_DATABASE from v$restore_point;

NAME GUA
——————————————————————————————————————————– —
SNAPSHOT_STANDBY_REQUIRED_11/23/2011 13:35:41 YES

SQL> select open_mode,database_role from v$database;

OPEN_MODE DATABASE_ROLE
——————– —————-
READ WRITE SNAPSHOT STANDBY

Now we are adding one new record on table which we created on primary. We are doing this to can show primary keeping redolog until our standby db will have againg physical standby database_role. When we will finish our process on snapshot database and convert it to physical standby,primary start again to send redo to standby database for apply.

On Primary

SQL> insert into test_table_on_primary values(‘standbyworkingas_snapshot’,sysdate);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from test_table_on_primary;

STATUS               TARIH
——————– —————————————————————————
before snapshot                     23-NOV-11 01.54.48.000000 PM
standbyworkingas_snapshot           23-NOV-11 01.59.47.000000 PM

So as you can see we have 2 records on table.

On standby

select * from test_table_on_primary

STATUS TARIH
——————– —————————————————————————
before snapshot 23-NOV-11 01.54.48.000000 PM

As you can see it brings only one record.

So now we can start to make our test on standby database

On standby

SQL> create table test_table_on_standby(status varchar2(20));

Table created.

SQL> insert into test_table_on_standby values(‘workingin_snapshot_role’);

1 row created.

SQL> commit;

SQL> select open_mode,database_role from v$database;

OPEN_MODE DATABASE_ROLE
——————– —————-
READ WRITE SNAPSHOT STANDBY

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount
ORACLE instance started.

Now we turn back our database role from SNAPSHOT STANDBY to PHYSICAL STANDBY

SQL> ALTER DATABASE CONVERT TO PHYSICAL STANDBY;

Database altered.

SQL> shutdown immediate
ORA-01507: database not mounted

ORACLE instance shut down.

SQL> startup mount
ORACLE instance started.

SQL> select open_mode,database_role from v$database;

OPEN_MODE DATABASE_ROLE
——————– —————-
MOUNTED PHYSICAL STANDBY

SQL> alter database recover managed standby database disconnect from session;

Database altered.

Now our standby database up and running… What we are expecting here? Redolog has been started to apply on standby database and our table should bring us to correct data

On standby

SQL> alter database open read only;

Database altered.

SQL> select * from test_table_on_primary;

STATUS               TARIH
——————– —————————————————————————
before snapshot      23-NOV-11 01.54.48.000000 PM
snapshotta           23-NOV-11 01.59.47.000000 PM

On standby we created test_table_on_standby…What we are expecting here? The table should not be exist after we stopped our process

SQL> select * from test_table_on_standby;
select * from test_table_on_standby
*
ERROR at line 1:
ORA-00942: table or view does not exist

Now we restart standby database wiht mount mode

SQL>alter database recover managed standby database cancel;
Database altered.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

QL> startup mount
ORACLE instance started.

SQL> alter database recover managed standby database disconnect from session;

Database altered.

As you can see we can make our test wihtout any problem wiht new future of Oracle11g

Reference:
11g Using Snapshot Standby Database. [ID 443720.1]

How to Generate A Schema Script to Compare with Another Schema

Gunes Erol — Thu, 08 Dec 2011 14:56:26 +0000

Sometimes We need to compare Schema which is on Test database wiht Production Schema. I am going to share one document which is using TOAD program for this purpose.

I hope you enjoy it.

How to Generate A Schema Script to Compare with Another Schema

Some new certification

Gunes Erol — Wed, 23 Nov 2011 08:32:02 +0000

Steven Chan has announcement about new certifications with Oracle E-Business Suite

First one Solaris 11 certified with E-Business Suite R12.1. You need to be on R12.1.1 or higher version for can run on this platform and also need to have the latest Rapid Install startCD version 12.1.1.13.

For details please click here

Steven Chan has announcement about 11.2.0.3 certification with E-Business Suite R11&R12. We are also waiting certification also for AIX platform for can start our upgrade process for our existing R12.1.3 system.

For details please click here

Oracle E-Business Suite Technology Webcasts and Training

Gunes Erol — Wed, 23 Nov 2011 08:17:09 +0000

Previously Steven Chan has been announce the online traning about EBS Webcasts and Training. For ppl who missed that event Steven Chan made post on his blog.

For details, presentation please click here

OOW- E-Business Related Session’s Presentations

Gunes Erol — Fri, 28 Oct 2011 08:40:01 +0000

As you know at OOW, There were 25 sessions avaliable for E-Business Suite which were mention by Steven Chan’s blog previously…

Three Hands-On Labs, two Meet the Experts round-table discussions, and five demoground booths planned just for E-Business Suite Applications Technology Group content.Click here for details.

Steven Chan made post for users who want to download those presentations.

Here is the links: OpenWorld 2011 Presentations Available for Download

Some of Hot news from Steven Chan

Gunes Erol — Fri, 28 Oct 2011 08:29:28 +0000

Someof good news about publish on Steven Chan blog. Here is the details to can get lastest certifications and also lastest news which is related wiht E-Business Suite.

Quarterly E-Business Suite Upgrade Recommendations: October 2011 Edition

EBS 12.1 Extended Support Fees Waived for First Year

Oracle Internet Directory 11gR1 11.1.1.5 Certified with E-Business Suite

Latest DSTv17 Timezone Patches Available for E-Business Suite R11i

Latest DSTv17 Timezone Patches Available for E-Business Suite R12

Sun JRE 1.6.0_29 Certified with Oracle E-Business Suite

Oracle Access Manager 11.1.1.5 Certified with E-Business Suite 12

Enterprise Manager Cloud Control-12c

Gunes Erol — Fri, 14 Oct 2011 14:45:14 +0000

As you heard/known Oracle Enterprise Manager family has new member Oracle Enterprise Manager 12c

Previous release we call it “Grid Control” but after this release we have new naming “Cloud Control”.

Here is the some links which could be helpful to get details about this new product:

1. All docs are available here:

http://download.oracle.com/docs/cd/E24628_01/index.htm

2. You can download this product from here:

http://www.oracle.com/technetwork/oem/grid-control/downloads/index.html

3. For pricing details :

http://www.oracle.com/us/corporate/pricing/index.html

4. For video&demo and more check here:

http://www.oracle.com/us/products/enterprise-manager/index.html

How to move ASM database files from one location to another by CP command

Gunes Erol — Tue, 20 Sep 2011 06:41:31 +0000

Sometimes we need to move one or more datafile from our tablespace to one location to another because of disk space issue.

In this article i try to explain how we can achive this process wiht CP command of asmcmd utulity via demo

If you want to do this process wiht RMAN utulity please check my other post by click here

How to move ASM database files from one location to another by CP command

Sometimes we need to move one or more datafile from our tablespace to one location to another because of disk space issue.

In this article i try to explain how we can achive this process wiht CP command of asmcmd utulity via demo

The database version is :

11.2.0.1

The Operating System is:

AIX 6.1

Let us check first the existing status

[oracle@TEST] export ORACLE_SID=+ASM
[oracle@TEST]echo $ORACLE_SID
+ASM
[oracle@TEST]sqlplus “/as sysasm”
SQL*Plus: Release 11.2.0.1.0 Production on Fri Apr 8 15:21:14 2011
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 – 64bit Production
With the Automatic Storage Management option

Let us see first our diskgroup :

SQL> select group_number, name, total_mb, free_mb, state, type from v$asm_diskgroup;

Group_Number	Name	Total_MB	Free_MB	State	Type
1	ORADATA	204800	128	CONNECTED

Before start, let us see status of our databases:

[oracle@TEST]export ORACLE_SID=TEST
[oracle@TEST]sqlplus “/as sysdba”
SQL> select log_mode from v$database;
LOG_MODE
 ————
 ARCHIVELOG

Now we need to identify which datafile or datafiles we will move. Here is the steps:

SQL> SELECT FILE_NAME FROM DBA_DATA_FILES where tablespace_name=’GUNESTABLESPACE’;
FILE_NAME
 ——————————————————————————–
 +ORADATA/TEST/datafile/gunestablespace.270.747153997
 +ORADATA/TEST/datafile/gunestablespace.271.747154095
 +ORADATA/TEST/datafile/gunestablespace.272.747154201
 +ORADATA/TEST/datafile/gunestablespace.273.747239703
 +ORADATA/TEST/datafile/gunestablespace.274.747934181
 +ORADATA/TEST/datafile/gunestablespace.275.747934253

Now we are going to follow below command to can copy one of datafile from one location to another by usingf CP command:

1. alter database datafile ‘+ORADATA/TEST/dafafile/gunestablespace.270.747153997′ offline;

2. create or replace directory orcl1 as ‘+ORADATA’;

create or replace directory orcl2 as ‘+ORADATA/Move_here/datafile’;

3. We should use DBMS_FILE_TRANSFER package

BEGIN

DBMS_FILE_TRANSFER.COPY_FILE(

source_directory_object => ‘ORCL1′,

source_file_name => ‘gunestablespace.270.747153997′,

destination_directory_object => ‘ORCL2′,

destination_file_name => ‘gunestablespace.270.747153997′);

END;

4. Rename file

ALTER DATABASE RENAME FILE ‘+ORADATA/gunestablespace.270.747153997′ TO ‘+ORADATA/Move_here/datafile/gunestablespace.270.747153997”;

5. alter database datafile ‘+ORADATA/pakb40/datafile/gunestablespace.270.747153997′ online;

Reference:

How to move ASM database files from one diskgroup to another ? [ID 330103.1]

E-Business Suite Technology-Related Sessions at OpenWorld 2011

Gunes Erol — Wed, 14 Sep 2011 14:19:26 +0000

As you know big day is coming “Oracle Open World 2011 “… It will be happen between October 2-6 2011 at San Francisco- USA

Steven Chan has been made one good post on his blog as always he does and he published E-Business Suite Related session at this event.

Some of you can have chance to join those session at OOW this year. For can see details please click here

For can get more information about OOW 2011 please visit here

How to relink oracle binaries?

Gunes Erol — Wed, 14 Sep 2011 07:25:04 +0000

Sometimes We need to require to relink oracle binaries because of some number of our cases and also We need to do it because of solution given by oracle support.

The following method will relink the oracle executables.

For Unix system

set $ORACLE_HOME,

set $ORACLE_SID

If you are using E-Business Suite login your system as oramgr user than source env file

Go to $ORACLE_HOME/bin path than run below commands for can relink binaries

$ORACLE_HOME/bin/relink all;

or you can use

$ORACLE_HOME/bin/relink oracle;

Referance:

How to Relink Oracle Database Software on UNIX [ID 131321.1]

If you are on 11gR2 level than I suggest also see below note:

Oracle 11gR2 Relink New Feature [ID 883299.1]

If you are using RAC than I suggest also see below note:

How to Check Whether Oracle Binary/Instance is RAC Enabled and Relink Oracle Binary in RAC [ID 284785.1]