Datafile autoextent

Question

Hi,
How can I check if the autoextend feature of the datafile is working.Is there any SQL command we can use to compare the actual datafile size and the incremented datafile size.
We have 6 datafile each of 2 GB in PSAPDAT tablespace with utoextend on next 20M maxsize 10G.
Does it mean that that tablespace can grow upto 60G. How can I check this. The issue is that I see the datafile in dba_data_files of the same size (i.e 2G).
Regards

Answer 1

Hello Mohammed,
at first just a suggestion:
> We have 6 datafile each of 2 GB in PSAPDAT tablespace with utoextend on next 20M maxsize 10G.
Please increase the AUTOEXTEND size up to 1 or 2 GB. Your actual autoextend size is too small to handle a "big" database object extent in a LMT tablespace with one extent. In a DMT tablespace it can be much more worse.
> Does it mean that that tablespace can grow upto 60G
Yes, your tablespace can grow to 6 * 10 GB = 60 GB
> Is there any SQL command we can use to compare the actual datafile size and the incremented datafile size.
You can query DBA_DATA_FILES to get these actual size and the max size, but you can not "check" the AUTOEXTEND feature - the datafiles are extended if needed.
>SQL> SELECT FILE_NAME, BYTES, MAXBYTES FROM DBA_DATA_FILES;
But you can check the initial datafile size after the creation and the actual size:
> SQL> SELECT NAME, BYTES, CREATE_BYTES FROM V$DATAFILE;
Regards
Stefan