Re: table/index size ???

From: Ron Rogers <RROGERS_at_galottery.org>
Date: Tue, 12 Mar 2002 04:38:47 -0800
Message-ID: <F001.00425547.20020312043847@fatcity.com>

Janet,
 This is the formula that I use to get projected storage needs for a table or index. It takes a lot of calculations and good faith estimates from the developers but the answer is pretty close.

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TO DETERMINE THE SIZE OF A TABLE STORAGE step 1. NUMBER OF ROWS IN TABLE. ---------------

step 2. NUMBER OF ROWS IN BLOCK.

NUMBER =COLUMN SIZE. 21 (maximum)
CHAR = COLUMN SIZE
VARCHAR = COLUMN SIZE
DATE = 7 Z=3+(SUM OF COLUMN SIZES)+(# OF COLUMNS < 250)+(3* # OF COLUMNS > 250)

X= DBBLK SIZE / Z       ---------------------------------------------

Y=DBBLK-(%FREE(DBBLK-(52+4(X)))

Y>=X*Z  ADJ X TO GET "TRUE"               ---------------------

step 3. TOTAL BLOCKS NEEDED.

TOT BLOCKS=ROWS IN TABLE/ROWS PER BLOCK TABLE SIZE =DBBLK SIZE * TOT BLOCKS / 1024 GIVES TABLE SIZE IN K.

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I usully try to plan a table for 2 years expected capacity. ROR mª¿ªm

>>> janetlinsy_at_yahoo.com 03/11/02 04:08PM >>>
Hi,

Does anyone know some scripts that can calculate table/index size, given the data block size, estimated number of rows, and table row size or index space per row? Acutally how to get table row size and index space per row?

Thank you!

Janet

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Received on Tue Mar 12 2002 - 06:38:47 CST