Disabling an old rac instance thread the great grandson of. 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. Sep 01, 2016 add drop redo log groups in oracle rac. If you use this clause to drop oracle managed files, then oracle database also removes all log file members from disk. 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. If you issue either the alter database drop logfile group. The research was performed on an oracle 10g release 2 server running on. This is done because oracle performs deferred batch writes i. Personalize my dashboard copyright 2019 oracle andor its affiliates all rights reserved. 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.
Start the oracle 10g xe database home page by selecting start all programs oracle database 10g express edition go to database home page. Rac redo log thread maintenance burleson oracle consulting. Using group numbers can make administering redo log groups easier. 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. Enable, disable, and drop a program create and drop a schedule create a job class data dictionary views sqlplus enhancements. Note that tablespaces taken offline normal do not require. The following statements can create online redologs in the flash recovery area. Find answers to delete redo log from the expert community at experts exchange. Has we already told in our previous post you can drop the log file which is active and current. To create a new group of standby redo logs, use the alter database statement with the add standby logfile group clause. Drop and recreate online redolog files oracle dba tips. Actually we cant resize the redo logfiles we have to drop the redo logfile and then recreate the redo logfile again with the new size whatever we want. 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.
How to add or increase the size of redo log files in rac. Oracle writes all statements except, select statement, to the logfiles. 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. Renamingdropping and recreating online redo logs and standby. Creating and connecting to odi master and work repositories. To drop specific inactive online redo log members, use the alter database statement with the drop. Disabling an old rac instance thread the great grandson. Now drop standby redo logs, leave the one which refuses to drop. Creating disk group in oracle 11g r2 guenadi n jilevskis.
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. Rather, the control files of the associated database are updated to drop the members of the group from the database structure. I have experience on database architecture,design and administrating ranging from 9i, 10g,11g on various platforms. Before dropping a redo log group, consider the following restrictions and precautions. Oracle managed files omf oracle managed files omf simplifies the creation of databases as oracle does all os operations and file naming. 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. Migration of oracle databases to netapp storage systems. Oracle 11g release 1 turned on auditing by default for the first time. Oracle dataguard how to resize redo log and standby redo. Every oracle database must have at least 2 redo logfile groups. You drop the online redo log group using the alter database drop logfile group command as seen in this example. Dropping redo log groups and members in oracle 10g tutorial 24. 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. We are in process of testing dataguard with physical standby.
Oracle 10g, oracle 11g oce, oracle 12c and oracle 11g opn certified specialist, ocp certified in oracle 9i, 10g, 11g. For appointment as a dba, a high level of skill and expertise is required. Auditing enhancements in oracle database 11g release 2. Oracle data pump expdp, impdp in oracle database 10g, 11g, 12c, 18c, 19c. 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. I need to set my redo log file to use 200mb to each group.
For example, adding groups to a redo log can correct redo log group availability problems. In this case, you can add new members to an existing group. Oracle data pump is a newer, faster and more flexible alternative to the exp and imp utilities used in previous oracle versions. 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. Consider the situation as follows i create a table,insert some rows into the table,then do a log switch. You will have to drop the tablespace or perform an incomplete recovery. In that i want to drop one group and that group is the active one. Whenever a change to the database state occurs, for example a table is created or dropped, or.
Dropping redo log groups and members in oracle 10g tutorial. And then i remove the logfile which still in the active states with operating system command. 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. Apr 29, 2012 session about oracle 10g redo log files and archived files. Managing the redo log oracle dba redo log management. Maximized oracle database intel ssd dc p3600 series nvme. U can drop the redo only when its status is inactive. Cant drop redo log group on standby oracle community. The unarchived option clears the corrupt online redo log and avoids archiving it. I would like to upgrade the driver to the thin ojdbc6. Specify a redo log file group as indicated for the add logfile member clause.
How to resize the online redo logfiles single instance. To create new redo log members for an existing group, use the sql statement alter database with the add logfile member clause. Oct 23, 2012 how to add or increase the size of redo log files in rac environment. Developers and dbas get help from oracle experts on. I needed to resize the redo log as it takes about 4 days to do a log switch. 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. This is commonly done if you need to increase or reduce the size of the online redo logs. How to resize redolog file in oracle one can succeed at. If we are using asm then we have to drop the file manually. Multiplexing online redo to fra helmuts rac jee blog. Disconnected from oracle database 10g enterprise edition release 10. 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. Plan the redo log of a database and create all required groups and members of redo log files during database creation. To drop a member of an active group, you must first force a log switch.
If the corrupt redo log file has not been archived, use the unarchived option in the alter database clear logfile statement. If so, then the data file and entire tablespace must be dropped once the clear logfile command completes. Begin dropping the redolog groups with statusinactive as mentioned earlier oracle will not allow you to drop a current online redolog file. After we created primary and standby dbs we realize what we havent put file names as per our standard.
Renamingdropping and recreating online redo logs and. Hello i have oracle 9, and i have a logfile corrupt, message. How to resize redolog file in oracle once, i receive the email regarding the resize of the redo log file. 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. Recovering after the loss of online redo log files. Best practices for oracle databases on netapp storage.
Ask tom alter database clear logfile oracle ask tom. Is there a way to change the group or permissions on these files without having to log in as the oracle account in unix. The oracle 10g architecture with the advent of so many big enterprises, the need to create a more sophisticated dbms has also increased. With multiplexed redo logs two or more identical copies can be placed in separate locations. You can drop one member of one group, even though all other groups have two members each. So i got the task to rename both, online redo logs and standby logs. How to manage and maintain redo logs groups and files create, add, drop, rename, move and switch. You just want to create the standby redo logs, right. Dropping redo log groups and members in oracle 10g. The size of a standby redo log must exactly match the primary database online redo logs. 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.
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. In some cases, it might not be necessary to create a complete group of redo log files. Recovering after the loss of all members of an online redo log group. My main interests are high availability and disaster recovery solutions for mission. How to drop corrupt or missing logfiles when logfiles are not present in the actual locations. Clearing a redo log file in oracle 10g tutorial 17 march.
Move redo logs to a ssd disk in a racasm env helmuts rac. Of course, there are times that you will want to drop a given redo log group. How to add or increase the size of redo log files in rac environment. In 10g you can use a workaround by erasing the header of the disk using the dd command. Hi amit, you can not change the size of any existing redo log. Ora00354 corrupt redo log block header, so i would like to drop this logfile but i have next error. Do not use clear logfile to clear a log needed for media recovery. Creating redo log groups and members in oracle 10g tutorial. U have to make a new redo logfile group of the size u want,and then drop the redolog u wanted to resize. It is ok to drop online redo log files, so that, a mirrored online redo log becomes temporarily unsymmetrical for e.
Jul 29, 2009 method to drop and recreate online redolog files with 2 members to each group. How to recreate redo log files in oracle database techgoeasy. Mar 05, 20 how to resize redo log and standby redo log in oracle dataguard environment. If this occurs, reissue the statement after the database is restarted. How to droprename standby redolog file in oracle 11g. If i drop that group it is telling that it is the current group. If the clear logfile statement is interrupted by a system or instance failure, then the database may hang. 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. Drop the old log file group and new with you desired file size 200mb. Clearing a redo log file in oracle 10g clearing a redo log file in oracle 10g courses with reference manuals and examples pdf. Asmca is introduced in oracle 11gr2 to facilitate asm new features management. Oracle data pump expdp, impdp in oracle database 10g, 11g.
For example, a file might be stored in an inappropriate location. An instance requires at least two groups of redo log files, regardless of the number of members in the groups. By default, oracle managed redo logs are 100m in size. How to resize the online redo logfiles oracle rac dba. To drop a redo log group, you must have the alter database system privilege.
Recovery of redo log file using log sequence number by rman. 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 article presents a brief explanation of how assorted oracle files can be renamed or moved to a new location. Oracle alter database add logfile tips oracle database tips by donald burlesonjanuary 12, 2015 question. The following statement clears the log files in redo log group number 3. The major tasks that should be performed by a dba are as follows. However, there are situations where you might want to create additional groups or members. The following benefits accrue from the standby redo log files. Rac redo log thread maintenance oracle consulting, oracle. The redo log files need to be first dropped and then created for this. The sender want the easiest way to size the redo log file something like alter database logfile group 1. 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.
Maximizing oracle database performance with intel ssd dc. To drop a redo log group, you must have the alter database system. 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. How to drop a log file group that is being the current logfile group. Oracle certification, database administration, sql, application, programming reference books droping logfile group failed. 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. 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. Create database oragrid maxinstances 1 maxloghistory 1 maxlogfiles 12 maxlogmembers 3 maxdatafiles 100 datafile.
Multiplexing the redo log files to protect against failure of the redo logs, oracle allows redo logs to be multiplexed. 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. It is critical that the redo logs are also considered because they might contain some of. However, the group number must be between 1 and maxlogfiles. How can delete the redo log file alter database add std logfile group 4 u01apporacleoradata orclredo0 4. To drop the current log file group, you must first issue an alter system switch logfile statement. 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.
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