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# How to calculate table size in 8i

From: CHAN Chor Ling Catherine (CSC) <clchan_at_nie.edu.sg>
Date: Tue, 09 Jul 2002 19:53:19 -0800
Message-ID: <F001.00493323.20020709195319@fatcity.com>

Hi Gurus,

I found an article in metalink 105765.1 "How to Determine Approximate Hard Drive Space Needed for a Specific Table". The formula for disk space is simply multiplying the average row length (by analyzing the table) * the number of rows in the table. It's very different from Metalink 10640.1 "Extent and Block Space Calculation and Usage in V7 Database" where it takes the block header etc in considerations but of course, article 10640.1 is for Version 7.

How do you gurus calculate table space in Version 8 ? Please advise. Thanks.

Regds,
New Bee

```Doc ID </help/usaeng/Search/search.html> : 	Note:105765.1	Content
Type: 	TEXT/PLAIN
Specific Table	Creation Date: 	18-APR-2000
Type: 	PROBLEM	Last Revision Date: 	26-DEC-2000
Status: 	PUBLISHED
```

Problem Description

How can you determine how much disk space is needed for a table?

Solution Description

You can use SQL to determine how much space is needed for the table based upon the average row length.

analyze CEUSER.CE_STATEMENT_LINES
compute statistics;

Now determine the average row length in bytes:

select avg_row_len
from dba_tables
where table_name=' CE_STATEMENT_LINES';

AVG_ROW_LEN

98

2. Multiple the average row length in bytes by the number of rows you believe

you will need:

98 (bytes) x 10000 records = 980000 bytes needed

References

For more information on the ANALYSE command, you may wish to refer to:

Oracle8 SQL Reference Release 8.0, Part No.A58225-01

Also:

Oracle8i SQL Reference Release 8.1.5, Part Number: A67779-01 .
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Author: CHAN Chor Ling Catherine (CSC)
INET: clchan_at_nie.edu.sg

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