Tuesday, October 9, 2007

Get Oracle Table Size

First, we must remember that table size is constantly changing as DML adds and removes rows. Also, we have many other factors that determine the "actual" size of a table:

The high water mark for the Oracle table
The number of allocated extents
The amount of spaced reserved on each block for row expansion (PCTFREE)

You need to ask yourself exactly which Oracle table size, you wish to query:

Do you want only the row space consumed? ( select avg_row_len*num_rows from dba_tables)

Do you want to include allocated file space for the table? (select . . . from dba_segments)

Do you want to include un-used extent space? (select . . . from dba_data_files, dba_extents . . )

Do you want to include un-used space up to the high water mark? This may over-estimate the real Oracle table size.

Do you want table sizes for Oracle growth monitoring?


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