Tips and tricks

What is Sysaux Datafile?

What is Sysaux Datafile?

The SYSAUX tablespace provides storage of non-sys-related tables and indexes that traditionally were placed in the SYSTEM tablespace. For example, the tables and indexes that were previously owned by the system user can now be specified for a SYSAUX tablespace.

What happens if Sysaux tablespace is full?

If your Database has enabled AUDIT and your auditing tablespace SYSAUX gets 100% full, NONE of database users will be able to log in to database anymore.

How do I recover Sysaux tablespace?

In this Document

  1. RMAN Block Recovery.
  2. Restore and Recover the Corrupted Datafile(s)
  3. Recreate the Corrupted Object.
  4. Export.

What is the significance of system and Sysaux tablespace?

Many database components use the SYSAUX tablespace as their default location to store data. Therefore, the SYSAUX tablespace is always created during database creation or database upgrade. The SYSAUX tablespace provides a centralized location for database metadata that does not reside in the SYSTEM tablespace.

What is Sysaux in the Oracle 10g database?

This is an auxiliary tablespace to the SYSTEM tablespace. The SYSAUX tablespace contains data for some components and products, reducing the load on the SYSTEM tablespace. Every database using Oracle Database 10g release 1 (10.1) or later must have a SYSAUX tablespace.

What uses the Sysaux tablespace?

Another major occupant of the SYSAUX tablespace is the embedded Enterprise Manager (EM) repository. This repository is used by Oracle Enterprise Manager Database Control to store its metadata. The size of this repository depends on database activity and on configuration-related information stored in the repository.

How do I check Sysaux tablespace usage?

You can monitor the occupants of the SYSAUX tablespace using the V$SYSAUX_OCCUPANTS view….This view lists the following information about the occupants of the SYSAUX tablespace:

  1. Name of the occupant.
  2. Occupant description.
  3. Schema name.
  4. Move procedure.
  5. Current space usage.

How do I resize a Sysaux tablespace in Oracle?


  1. Reduce the amount of monitored objects in EM.
  2. Resize the SYSAUX tablespace according to the recommendations in above table. ALTER DATABASE DATAFILE ‘/path/systemSID.dbf’ RESIZE 1000M;
  3. Resize the SYSTEM tablespace. ALTER DATABASE DATAFILE ‘/path/sysauxSID.dbf’ RESIZE 1000M;

Can we drop Sysaux tablespace?

You cannot drop the SYSTEM tablespace. You can drop the SYSAUX tablespace only if you have the SYSDBA system privilege and you have started the database in MIGRATE mode. You may want to alert any users who have been assigned the tablespace as either a default or temporary tablespace.

What is Oracle SYSTEM tablespace?

An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database’s data. Each tablespace in an Oracle database consists of one or more files called datafiles, which are physical structures that conform to the operating system in which Oracle is running.

What is the difference between system and Sysaux tablespace in Oracle?

How do I clean up tablespace?

First, specify the name of the tablespace that you want to drop after the DROP TABLESPACE keywords. Second, use the INCLUDE CONTENTS to delete all contents of the tablespace. If the tablespace has any objects, you must use this option to remove the tablespace.

Can we increase the size of Sysaux tablespace?

Yes you can add/re-size datafiles to increase the SYSAUX tablespace size.

Can I have a database without Sysaux tablespace in 11g?

You cannot live without it. SYSAUX is all of the other systems of your body – you can survive without them but for optimal performance it’s best to keep them in good working order.

What is difference between table and tablespace?

The tablespace is where tables gets stored. It links the physical storage layer (files on disks) and the logical storage layer (tables, indexes).

How do I free up space in Oracle?

Free Up Disk Space

  1. Log in as the oracle user.
  2. Find and remove the dump files. Copy. find . – name OCSDMDW_Dump*.dmp | xargs rm –rf.

How do I find my Sysaux occupants?

Check the largest object in the SYSAUX tablespace SQL> select OCCUPANT_NAME, SCHEMA_NAME, MOVE_PROCEDURE, SPACE_USAGE_KBYTES from v$sysaux_occupants; You use the move procedure command to move the occupant to another tablespace unless the move procedure is null.

What is Sysaux tablespace in Oracle?

The SYSAUX tablespace stores data for auxiliary applications such as the Log Miner, Work space Manager, Oracle Data Mining, Oracle Streams, and many other Oracle tools. This tablespace is automatically created if you use the DataBase Creation Assistant(DBCA) software to build an Oracle database.

How many datafiles can a tablespace have?

1022 datafiles
A smallfile tablespace is a traditional Oracle tablespace, which can contain 1022 datafiles or tempfiles, each of which can contain up to approximately 4 million (222) blocks. Dependent on the operating system. An external table can be composed of multiple files.

How do I recreate Sysaux tablespace in Oracle?

1 Answer

  1. Find the corrupt block (V$DATABASE_BLOCK_CORRUPTION) Run the following script to retrieve the blocks that are corrupt:
  2. Rebuild all the indexes (Script)
  3. Run DBMS_REPAIR()
  4. Open up a Service Request.

What is system and Sysaux tablespace in Oracle?

SYSAUX. This is an auxiliary tablespace to the SYSTEM tablespace. The SYSAUX tablespace contains data for some components and products, reducing the load on the SYSTEM tablespace. Every database using Oracle Database 10g release 1 (10.1) or later must have a SYSAUX tablespace.

How do I increase the number of datafiles in Oracle?

You can increase the value by adding the db_files parameter to ./oracle/admin/aleph1/pfile/initaleph1. ora and restarting Oracle. To prevent this possible problem, you can check with UTIL-O-13-1 to see how many database files you have.

How do I check datafiles associated with tablespace?

SELECT * from DBA_TABLESPACES; To view all the datafiles of a particular tablespace, execute the following command. This command will display all the datafiles that as currently associated with thegeekstuff tablespace. This will also display the size of the datafiles in MB.

How many maximum datafiles can there be in an Oracle database?

There is a UNIX kernel limit for the maximum number of open files. There is an absolute Oracle maximum of 65533 files in a database and usually 1022 files in a tablespace. However, certain hardware platforms have a limit lower than this absolute maximum.

What is Db_files parameter in Oracle?

The db_files parameter is a “soft limit ” parameter that controls the maximum number of physical OS files that can map to an Oracle instance. Historically (before Oracle8i) you need to be careful not to set db_files too high, else you would have DBWR (database writer) issues.