How to Recover Oracle 10G Database Using Data Files-Redo logs-Control files during OS failure


Hi Guys,
              Many times we have seen that when the operating system get failure due to something miss happening or miss handled with the system and the system contains the very important databases which you don't wanna loose at any cost and you do not have any backup for that. So I am writing this technique how to recover the Oracle 10G database on this situation. It is very interesting & the easiest way to recover the database.If something like this happened with you then don't worry go with the below mentioned steps and restore your database:
For recovering the database we have to need following files.

1.      Database datafiles
2.      Control files
3.      Redologs
4.      Parameter files
5.      Other database related files
Database datafiles:
Database data files are physical files which are stored on secondary memory. These files are used to store the physical data. Database data files are only written by the Oracle DB Writer. These physical data files are associated with Oracle Tablespaces which are logical containers for tables and indexes. Database datafiles are basically located on path D:\oracle\ product\10.2.0\oradata\sid\

Example of datafiles:

 DR01.DBF, INDX01.DBF, TOOLS01.DBF, TEMP01.DBF, SYSTEM01.DBF, USERS01.DBF, RBS01.DBF & .ORA
Control Files:
The Control files of the database is a binary file that contains the essential information about the database. The control files contains the information like database name, database log files.Without
control files Oracle cannot works it is mandatory for database.Because the control files are so important & Oracle allows you to maintain duplicate copies of the control files.
These control files are located on D:\product\10.2.0\oradata\sid\
Example of Control Files:
CONTROL01.CTL, CONTROL02.CTL,CONTROL03.CTL
 Online redo logs concepts:

Online redo logs like a tape recorder that records every change in the Oracle database. As modification occur, they are continuously recorded in the online redo logs.
 Oracle requires two online redo logs which are assigned to the database. Oracle writes the redo to the first log and when the first log is full then Oracle will switch to the second log and write the same redo logs.
Redologs are also located on the same path where the control & datafiles resides d:\ oracle\ product\10.2.0\oradata \sid\
 Examples of Redologs:
REDO01.LOG, REDO02.LOG, REDO03.LOG 
Oracle Parameter file Concepts:
 The parameter file (also called init.ora) contains configuration information for the database to use at startup time. The parameter file you configure how much RAM the database is use, where to find the control files, where to write trace file,alert file and a whole host of other information. Many times the oracle database will not start without a parameter file. Oracle also allows you to have a manual parameter file (called a PFILE) or a server-side parameter file (called a SPFILE). Parameter file is located on path D:\oracle\ product\10.2.0\admin\sid\pfile\ init.ora

Steps for recovering the database:  

1. After installing the fresh operating system you have to installed oracle 10G on the same drive again where the Oracle were installed earlier for the easy recovery of the database.
2. But before new installation of oracle engine take the backup of all required files which are mentioned below.

init.ora from D:\oracle\ product\10.2.0\admin\sid\pfile\,
pwdSID from D:\ oracle\product\10.2.0\db_1\database\.
Redologs(REDO01.LOG, REDO02.LOG, REDO03.LOG),
Control files (CONTROL01.CTL, CONTROL02.CTL,CONTROL03.CTL ) &
.DBF(DR01.DBF,INDX01.DBF,TOOLS01.DBF,TEMP01.DBF, SYSTEM01.DBF, USERS01.DBF,RBS01.DBF)&.ORA files from D:\oracle \ product\10.2.0\oradata\ 
3.  Now place the all backup files on below mentioned path 

Place Redologs,Control files & .DBF & .ORA files on location D:\oracle\ product\10.2.0 \oradata\
init.ora on location D:\oracle\ product\10.2.0\admin\sid\pfile\   and
PWDSID.ora on location  D:\ oracle\product\10.2.0\db_1\database\. 

4. And then restart the oracle services and run the SQL console.
Hope this will help You.
Have a nice Day....

Regards,
Sampan

Comments

  1. 21st Century Software Solutions14 May 2014 at 19:52

    Oracle 11g XML Developer Online Training
    Oracle SOA/BPEL 11g Online Training
    Oracle Golden Gate 11g Online Training
    Oracle Fusion Middleware 11g Online Training
    Oracle Directory Services 11g Online Training
    Oracle SOA Suite 11g -
    http://www.21cssindia.com/courses/oracle-11g-xml-developer-online-training-121.html
    Basic Concepts and Architecture - Overview of service-oriented architecture (SOA) - Overview XML, XSD, X Path, XSLT, SOAP, WSDL, UDDI - The basic concepts of Oracle BPEL Process Manager - BPEL Process Manager components - Installation - Overview of the fusion architecture - Overview of the Web logic server -

    ReplyDelete

Post a Comment

Popular posts from this blog

How to Read Excel File in VC++....

Image
Hi Guys,               If you want to read your Excel sheet using  c++ application then don't worry go for the below mentioned steps and connect your apps and with c++.But before doing this you need to install the Visual Studio 6.0 and develop a win32 console application with c++ source file. STEPS:       1. Keep libxl-3.1.0 inside c headerfiles.       2. Include include folder of libxl into vc++ Tools->options->Directories include files. 3. Include the library file of libxl in vc++6.0 Tools->options->Directories library files.   4. Include the bin file of libxl in vc++6.0 Tools->options->Directories Executable files.       5.       Keep the libxl.dll in current working folder.                      Sample Code for reading Excel file  in C++: #include <iostream>        #include <wchar.h>       #include "libxl.h"       #pragma comment(lib, "libxl")       u
Read more

Window could not start the Apache tomcat 6 on Local Computer.For more information, review the System Events Logs.If this is a non-Microsoft service,contact service vendor, and refer to service-specific error code 0.

Image
Hi Guys,               Several times we have faced the problem with Apche Tomcat 6 service, It seems fail to start the service of Tomcat Apache and gettting error code 0 even its not work on installation again below is the snapshot of error. So I am writing technique how can we start the Tomcat Apache Services , Just copy one file & paste into Tomcat Apache bin folder please follow the some steps. Follow the below mentioned steps:  1. Copy the file(msvcr71.dll) from location  C:\Program Files\Java\jdk1.6.0_02\bin\  2. Paste the (msvcr71.dll) file into location      C:\Program Files\Apache Software Foundation\Tomcat6.0\bin  3.  After paste start the tomcat service and it will be started and works.  4.  For testing the apache hit the browser with http://localhost:8080/ it display the index page of Apache tomcat it means apache is working fine. Hope this will work for You. Have a Nice day...)
Read more

How to Bind Multiple SMPP Acounts Using Kannel SMS Gateway.

Hi guys,              Below I have written the script of complete kannel configuration in which I have binded the multiple SMPP accounts with mysql database. Please change your configuration according to your requirement. It is 100 % worked for me and hope it will work for you also. # CORE # # There is only one core group and it sets all basic settings # of the bearerbox (and system). You should take extra notes on # configuration variables like 'store-file' (or 'store-dir'), # 'admin-allow-ip' and 'access.log' group = core admin-port = 13000 smsbox-port = 13001 admin-password = bar dlr-storage = mysql log-file = "/var/log/kannel/kannel.log" access-log = "/var/log/kannel/bearerbox-access.log" access-log-clean = true log-level = 0 box-deny-ip = "*.*.*.*" box-allow-ip = "127.0.0.1" # SMSC CONNECTIONS # # SMSC connections are created in bearerbox and they handle SMSC specific # protocol and m
Read more