Author: ktailor

ORA-30012: undo tablespace ‘UNDOTBS01′ does not exist or of wrong type

I was recently recovering a backup of a standby database, the standby was from a primary that was a RAC with 2 nodes.  I had the following error:

SQL> startup

ORACLE instance started.

Total System Global Area 3170893824 bytes

Fixed Size                  2043968 bytes

Variable Size            2030047168 bytes

Database Buffers         1124073472 bytes

Redo Buffers               14729216 bytes

Database mounted.

ORA-01092: ORACLE instance terminated. Disconnection forced

ORA-30012: undo tablespace 'UNDOTBS01' does not exist or of wrong type

Process ID: 19872

Session ID: 1218 Serial number: 3

Solution

[oracle@eux3300392 dbs]$ vi initps82live.ora

undo_management=MANUAL

SQL> startup

ORACLE instance started.

Total System Global Area 6313463808 bytes

Fixed Size                  2264976 bytes

Variable Size            1677721712 bytes

Database Buffers         4613734400 bytes

Redo Buffers               19742720 bytes

Database mounted.

Database opened.

SQL>

4. create a new undo tablespace, e.g.:

CREATE UNDO TABLESPACE "UNDOTBS3" DATAFILE '+DATA' SIZE 10880M AUTOEXTEND ON NEXT 5120K MAXSIZE 32767M

5. shutdown the database

6. change UNDO_MANAGEMENT=AUTO in your init file and set UNDO_TABLESPACE=UNDOTBS (or whatever name you specified during the undo tablespace creation)

7. connect "/ as sysdba" and startup the database using this init file (as in step 2).

Now the database will open using the new undo tablespace and it would have created new undo segments in this tablespace.

   

Adding New Redo Log Groups

An error occurs when deleting a logfile group after you have added new groups. SQL> alter database drop logfile group 3; alter database drop logfile group 3 * ERROR at line 1: ORA-01623: log 3 is current log for instance   Solution SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL> alter system checkpoint; System altered. SQL> alter database drop logfile group 3; Database altered. Then just check by doing the following: SQL> select member from v$logfile;  

Cannot mark instance UNNAMED_INSTANCE as enabled

 

I was recently recovering a backup of a standby database, the standby was from a primary that was a RAC with 2 nodes.  I had the following error:

 

SQL> alter database open resetlogs;

alter database open resetlogs

*

ERROR at line 1:

ORA-38856: cannot mark instance UNNAMED_INSTANCE_2 (redo thread 2) as enabled

 

Solution

 

Edit the .ora file add the following:

*._no_recovery_through_resetlogs=TRUE

Save

 

SQL> shutdown immediate;

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

 

SQL> startup mount;

 

ORACLE instance started.

Total System Global Area 6313463808 bytes

Fixed Size                  2264976 bytes

Variable Size            1677721712 bytes

Database Buffers         4613734400 bytes

Redo Buffers               19742720 bytes

Database mounted.

 

SQL> alter database open resetlogs;

Database altered.

 

shutdown and remove the line added above and restart instance

   

Basic IOPS

I was asked about IOPS, so that a new server could be sized, this could help. Your results might look something like: Remember that statistics contained in the GV$ views are cumulative and therefore should be sampled. You then subtract your first statistics from the last statistics to give you the throughput. It is now easy to calculate the IOPS for small and large I/O and also MBPS. The following calculations will assist in determining the workload for the current database system. Small Read IOPS =(333474-106883)/(10*60) = 377 IOPS Small Write IOPS =(500211-205903)/(10*60) = 490 IOPS Total Small IOPS =(226591+294308)/(10*60) = 868 IOPS I/O Percentage of Reads to Writes = 44:56 Large Read IOPS =(8010-2791) /(10*60) = 8 IOPS Large Write IOPS =(142981-40298)/(10*60) = 171 IOPS Total Large IOPS =(5219+102683) /(10*60) = 179 IOPS I/O Percentage of Reads to Writes = 4:96 Total MBPS Read =((5586081648-2009381888) /(10*60))/1048576= 5 MBPS Total MBPS Written =((22232604961-4188587008)/(10*60))/1048576= 28 MBPS Total MBPS =((3576699760+18044017953)/(10*60))/1048576= 34 MBPS We could conclude from these figures that this is more of a OLTP as there is more writes occurring.

How to recreate database dbconsole

Steps to recreate database dbconsole 1) emca -deconfig dbcontrol db -repos drop 2) Normally you would run emca -reconfig all db -repos recreate but we want to specify a listener home This will recreate the dbconsole.