How can I tell if tablespace is Autoextend?

We can query the DBA_DATA_FILES view to check whether the data file is in AUTOEXTEND mode. SQL> select tablespace_name, file_name, autoextensible from dba_data_files; To confirm whether the maxsize is set to UNLIMITED we have to check for the maximum possible size, as there is no concept of an ‘UNLIMITED’ file size.

How do I add a datafile to a tablespace with Autoextend?

The following example enables automatic extension for a datafile added to the users tablespace: ALTER TABLESPACE users ADD DATAFILE ‘/u02/oracle/rbdb1/users03. dbf’ SIZE 10M AUTOEXTEND ON NEXT 512K MAXSIZE 250M; The value of NEXT is the minimum size of the increments added to the file when it extends.

What is a Bigfile tablespace?

A bigfile tablespace consists of a single data or temporary file which can be up to 128 TB. The use of bigfile tablespaces can significantly reduce the number of data files for your database. Oracle Database supports parallel RMAN backup and restore on single data files.

What is Autoextend on tablespace?

6.4 Autoextend Tablespace. You can set a tablespace to automatically extend itself by a specified amount when it reaches its size limit. If you do not enable autoextend, then you are alerted when the tablespace reaches its critical or warning threshold size.

How do I add datafile to ASM with Autoextend?

So either you can add datafile in ASM or else you can add datafiles to tablespace in Oracle located on file system. Before adding datafile in Oracle you can check its initial allocated size which is bytes and how much it can grow or extend if autoextend is on which is referred as maxbytes.

Can multiple tablespaces can share a single datafile?

there is no possibility to store one data files in to two table space.

What is autoextend on feauture for tablespaces?

Oracle DBA should use the Autoextend On feauture for tablespaces to set a tablespace to automatically extend itself by a specified amount when it reaches its maximum size limit.   If tablespaces’ autoextend is not enabled, then you are alerted when the tablespace reaches its critical or warning threshold size.

What happens if I don’t enable autoextend?

If you do not enable autoextend, then you are alerted when the tablespace reaches its critical or warning threshold size. The critical and warning threshold parameters have default values that you can change at any time. These parameters also cause alerts to be generated for autoextending tablespaces that are approaching their specified size limit.

How to check if a datafile is autoextensible?

You can check the autoextensible of datafiles using the following script. select file_name,tablespace_name,maxbytes from dba_data_files where autoextensible=’NO’; If the autoextensible of datafile is NO, autoextensible feature is not enabled for the related datafile, and datafile will not auto extend.

How to respond to size alerts for autoextending tablespaces?

These parameters also cause alerts to be generated for autoextending tablespaces that are approaching their specified size limit. You can respond to size alerts by manually increasing the tablespace size. You do so by increasing the size of one or more of the tablespace data files or by adding another data file to the tablespace.