Calculate the disk space required for the INDEX

Hello

How to calculate the disk space required to create an INDEX? Please tell me where I can get the details of resources.

For example:
I need to create a non-UNIQUE INDEX on the columns, an approximate size would do.

< PRE >
NOT NULL DATE EVENT_DATE
APPT_DATE_SLOT VARCHAR2 (15)
EVENT_STATUS VARCHAR2 (4)
< / PRE >

The table has some 7 300 000 rows. I would like to know how to calculate too.

All AIDS are very much appreciated.

A rough estimate of the index space will need is possible by

adding the actual length expected from each column, plus 6 for the rowid, 2 for the number of the X-header of the rows in the table that will be so an entry

Date are 7 bytes internal + 15 + 4 + 2 + 6 = 34 X 7.3 M = 248200000 X General fresh for the block header, initrans, etc...

We will use 20% overhead block or 1.2 X 248200000 = 297840000, which is about 285 M

The actual distribution will vary according to your method of range tablespace.

HTH - Mark D Powell.

Tags: Database

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