Drop logfile group oracle 10g driver

How can delete the redo log file alter database add std logfile group 4 u01apporacleoradata orclredo0 4. Ask tom alter database clear logfile oracle ask tom. Creating and connecting to odi master and work repositories. For appointment as a dba, a high level of skill and expertise is required. So i got the task to rename both, online redo logs and standby logs. You just want to create the standby redo logs, right. Oracle alter database add logfile tips oracle database tips by donald burlesonjanuary 12, 2015 question. I need to set my redo log file to use 200mb to each group. Drop and recreate online redolog files oracle dba tips. Oracle data pump expdp, impdp in oracle database 10g, 11g, 12c, 18c, 19c.

How to manage oracle redo logfiles oracle dba online. Now drop standby redo logs, leave the one which refuses to drop. When do i use the alter database add logfile to add an online redo log can i use the alter database add logfile when adding a logfile group. Rather, the control files of the associated database are updated to drop the members of the group from the database structure. Alter system dump logfile filename scn min minimumscn scn max maximumscn time min minimumtime time max maximumtime layer layer opcode opcode dba min filenumber blocknumber dba max filenumber blocknumber rba min logfilesequencenumber blocknumber rba max logfilesequencenumber blocknumber objno objectnumber xid undosegmentnumber. Drop the old log file group and new with you desired file size 200mb. How to droprename standby redolog file in oracle 11g. Dropping redo log groups and members in oracle 10g tutorial 24. Creating redo log groups and members in oracle 10g tutorial. Apr 29, 2012 session about oracle 10g redo log files and archived files.

Finally i shutdown and restart the database, the database complains that the logfile group does not exist,so i drop the logfile group and open the database. Renamingdropping and recreating online redo logs and. Oracle managed files omf oracle managed files omf simplifies the creation of databases as oracle does all os operations and file naming. Rac redo log thread maintenance burleson oracle consulting. I have experience on database architecture,design and administrating ranging from 9i, 10g,11g on various platforms. Jul 29, 2009 method to drop and recreate online redolog files with 2 members to each group. Hi amit, you can not change the size of any existing redo log. Maximized oracle database intel ssd dc p3600 series nvme. Recovery of redo log file using log sequence number by rman. If a media failure damages all members of an online redo log group, then different scenarios can occur depending on the type of online redo log group affected by the failure and the archiving mode of the database. It is ok to drop online redo log files, so that, a mirrored online redo log becomes temporarily unsymmetrical for e. Disabling an old rac instance thread the great grandson of.

When a redo log group is dropped from the database, and you are not using the oracle managed files feature, the operating system files are not deleted from disk. Every oracle database must have at least 2 redo logfile groups. The sender want the easiest way to size the redo log file something like alter database logfile group 1. Hello i have oracle 9, and i have a logfile corrupt, message. Auditing enhancements in oracle database 11g release 2. Move redo logs to a ssd disk in a racasm env helmuts rac.

When oracle generates the logfile and badfile during and external load on the unix server, they are created with the user and group of user oracle and a group of dba and permissions of rwrr. Find answers to delete redo log from the expert community at experts exchange. After we created primary and standby dbs we realize what we havent put file names as per our standard. In that i want to drop one group and that group is the active one. Oracle data pump is a newer, faster and more flexible alternative to the exp and imp utilities used in previous oracle versions. I guess you have data in strings that cannot be converted to a number and only this user it hitting that data, others are not using that particular bad piece of data.

The examples are based on a default oracle 10g installation on windows, but the method is the same for different versions of oracle on any platform, with the exception of the host command used to rename the file. If the corrupt redo log file has not been archived, use the unarchived option in the alter database clear logfile statement. If the failure occurred because of io errors accessing one member of a log group, then that member can be dropped and other members added. The research was performed on an oracle 10g release 2 server running on.

However, there are situations where you might want to create additional groups or members. We are in process of testing dataguard with physical standby. With multiplexed redo logs two or more identical copies can be placed in separate locations. The following statements can create online redologs in the flash recovery area. Alter database drop logfile group 3 when a redo log group is dropped from the database, and you are not using the oraclemanaged files feature. The size of a standby redo log must exactly match the primary database online redo logs. However, the group number must be between 1 and maxlogfiles. Sep 01, 2016 add drop redo log groups in oracle rac.

Im testing cloning using rman, working with small databases, im performing several clones with different approaches, trying to find an optimal way to perform automatized cloning on demand. This is done because oracle performs deferred batch writes i. Enable, disable, and drop a program create and drop a schedule create a job class data dictionary views sqlplus enhancements. Disabling an old rac instance thread the great grandson. Oct 23, 2012 how to add or increase the size of redo log files in rac environment. How to resize redolog file in oracle one can succeed at.

Oracle certification, database administration, sql, application, programming reference books droping logfile group failed. To create a new group of standby redo logs, use the alter database statement with the add standby logfile group clause. After dropping a redo log file, ensure that the drop completed successfully, and then use the appropriate operating system command to delete the dropped redo log file. Migration of oracle databases to netapp storage systems. If i drop that group it is telling that it is the current group. For example, a file might be stored in an inappropriate location. How to drop corrupt or missing logfiles when logfiles are not present in the actual locations.

An instance requires at least two groups of redo log files, regardless of the number of members in the groups. Dropping redo log groups and members in oracle 10g. Ora00350 log string of thread string needs to be archived, and i can not drop it, could you let me know what i can do. U can drop the redo only when its status is inactive. Oracle data pump expdp, impdp in oracle database 10g, 11g. Multiplexing online redo to fra helmuts rac jee blog. How to resize the online redo logfiles oracle rac dba. A group could already exist, but not be complete because one or more members of the group were dropped for example, because of a disk failure. You drop the online redo log group using the alter database drop logfile group command as seen in this example. Renamingdropping and recreating online redo logs and standby. Plan the redo log of a database and create all required groups and members of redo log files during database creation. Creating disk group in oracle 11g r2 guenadi n jilevskis.

Of course, there are times that you will want to drop a given redo log group. Oracle 11g release 1 turned on auditing by default for the first time. Managing the redo log oracle dba redo log management. How to manage and maintain redo logs groups and files create, add, drop, rename, move and switch. How to resize redolog file in oracle once, i receive the email regarding the resize of the redo log file. To effect a change in size, you simply have to add new logs of the new size, and then drop the old logs of the old size. The following statement clears the log files in redo log group number 3.

Is there a way to change the group or permissions on these files without having to log in as the oracle account in unix. Nov 29, 2007 especially to benefit from migrations most to remove the cbo parameters and let them to take their version specific default values and then monitor and tune is a better strategy. Consider the situation as follows i create a table,insert some rows into the table,then do a log switch. If the clear logfile statement is interrupted by a system or instance failure, then the database may hang. The oracle 10g architecture with the advent of so many big enterprises, the need to create a more sophisticated dbms has also increased. After dropping an online redo log file, make sure that the drop completed successfully, and then use the appropriate operating system command to delete the dropped online redo log file. To drop a redo log group, you must have the alter database system privilege. Using group numbers can make administering redo log groups easier.

In some cases, it might not be necessary to create a complete group of redo log files. Dropping redo log groups and members in oracle 10g tutorial. Asmca is introduced in oracle 11gr2 to facilitate asm new features management. Do not use clear logfile to clear a log needed for media recovery. Recovering after the loss of all members of an online redo log group. Cant drop redo log group on standby oracle community. You can drop one member of one group, even though all other groups have two members each.

If so, then the data file and entire tablespace must be dropped once the clear logfile command completes. For example, adding groups to a redo log can correct redo log group availability problems. Developers and dbas get help from oracle experts on. Set the redo log size to be larger than 10 gb and assign 10 redo logs for. How to add or increase the size of redo log files in rac environment. Rac redo log thread maintenance oracle consulting, oracle. Recovering after the loss of online redo log files.

To create new redo log members for an existing group, use the sql statement alter database with the add logfile member clause. Oracle 10g, oracle 11g oce, oracle 12c and oracle 11g opn certified specialist, ocp certified in oracle 9i, 10g, 11g. Senior oracle dba, oracle 10g, oracle 11g oce, oracle 12c and oracle 11g opn certified specialist, ocp certified in oracle 9i, 10g, 11g and 12c. Do not skip redo log file group numbers that is, do not number your groups 10, 20, 30, and so on, or you will consume unnecessary space in the control files of the database. The major tasks that should be performed by a dba are as follows. Whenever a change to the database state occurs, for example a table is created or dropped, or. How to drop a log file group that is being the current logfile group. Clearing a redo log file in oracle 10g tutorial 17 march. Specify a redo log file group as indicated for the add logfile member clause. As part of the tests im using the drop database command, that made a fast and efficient cleanup of all datafiles, redologs and control files in one command.

And then i remove the logfile which still in the active states with operating system command. If we are using asm then we have to drop the file manually. Before dropping a redo log group, consider the following restrictions and precautions. Best practices for oracle databases on netapp storage. For example if i have an id column with a value of 100, 200, 300 etc i would like to multiplay every single value with a constant value like say 2 or 3. To drop a member of an active group, you must first force a log switch. Jul 06, 2010 creating disk group in oracle 11g r2 in this post we will look at how to add new disks, prepare the disks using oracle asmlib and will create a disk group using asm configuration assistant asmca based on those newly added disks. Begin dropping the redolog groups with statusinactive as mentioned earlier oracle will not allow you to drop a current online redolog file. Clearing a redo log file in oracle 10g clearing a redo log file in oracle 10g courses with reference manuals and examples pdf. If you use this clause to drop oracle managed files, then oracle database also removes all log file members from disk. The oracle 10g database introduces a new framework for managing many tuning tasks automatically, for producing realtime information about the databases health, and for extending advisories to improve performance. Has we already told in our previous post you can drop the log file which is active and current.

In 10g you can use a workaround by erasing the header of the disk using the dd command. Oracle writes all statements except, select statement, to the logfiles. Articles oracle 8i oracle 9i oracle 10g oracle 11g oracle 12c oracle c oracle 18c oracle 19c miscellaneous plsql sql oracle rac oracle apps weblogic linux mysql. Mar 05, 20 how to resize redo log and standby redo log in oracle dataguard environment. To drop a redo log group, you must have the alter database system. The following benefits accrue from the standby redo log files. I would like to upgrade the driver to the thin ojdbc6. Multiplexing the redo log files to protect against failure of the redo logs, oracle allows redo logs to be multiplexed. How to add or increase the size of redo log files in rac. To drop the current log file group, you must first issue an alter system switch logfile statement. The redo log files need to be first dropped and then created for this.

My main interests are high availability and disaster recovery solutions for mission. Similarly, you can also drop logfile group only if the database is having more than two groups and if it is not the current group. This article presents a brief explanation of how assorted oracle files can be renamed or moved to a new location. Dropping redo log groups and members in oracle 10g dropping redo log groups and members in oracle 10g courses with reference manuals and examples pdf. Ora00354 corrupt redo log block header, so i would like to drop this logfile but i have next error. Disconnected from oracle database 10g enterprise edition release 10. U have to make a new redo logfile group of the size u want,and then drop the redolog u wanted to resize. Create database oragrid maxinstances 1 maxloghistory 1 maxlogfiles 12 maxlogmembers 3 maxdatafiles 100 datafile.

I needed to resize the redo log as it takes about 4 days to do a log switch. This is commonly done if you need to increase or reduce the size of the online redo logs. It is critical that the redo logs are also considered because they might contain some of. Table of contents mutliplexing redo logfile within fradropping a redo logreference mutliplexing redo logfile within fra the following statements can create online redologs in the flash recovery area. You will have to drop the tablespace or perform an incomplete recovery. How to resize the online redo logfiles single instance. After dropping a redo log group, make sure that the drop completed successfully, and then use the appropriate operating system command to delete the dropped redo log files. Hi tom, i was wondering if there is a way of exporting the database but have the ability to modify an id column in the tables. Oracle dataguard how to resize redo log and standby redo. By default, oracle managed redo logs are 100m in size. Maximizing oracle database performance with intel ssd dc. To drop specific inactive online redo log members, use the alter database statement with the drop. Start the oracle 10g xe database home page by selecting start all programs oracle database 10g express edition go to database home page.

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