Paul, Check the storage params on the tablespace. Could be that the initial extent for the tbs is 512k. I think this would trump the table storage param. Tom Mercadante Oracle Certified Professional -----Original Message----- From: Paul Vincent [mailto:Paul.Vincent@xxxxxxxxx] Sent: Wednesday, September 15, 2004 2:46 AM To: Oracle-L@Freelists. Org (E-mail) Subject: Relating actual object size to Storage parameters I just spotted something puzzling. I was checking the sizing of some Oracle 8i tables, using TOAD's Schema Browser. There are tables and indexes which have initial and next extent sizes of 409600 (400K), have only a single extent, yet the "Size in bytes" is given as 524288 (512K). The db_block_size is 8192 (8K), and 400K is a multiple of 8K, so why do the storage parameters for these objects appear to have been ignored? Any ideas? Paul Vincent Database Administrator University of Central England -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l