database size

[Mara]

How many tables should a database have to be considered big? Mine has around 80.
Thanx

[sreddy]

No of tables in a database doesn't specify the size of the database.Because, One can have one table that occupies 2GB or 200 tables that occupie 2GB.So, Its the space(in MB/GB/Tera Bytes) occupied by all datafiles on the OS file systems.

There are other factors like No of concurrent users, transaction volume adds to scalability and capacity of database.

[darshil_db]

hi,

Bye no. of tables u can not judge the database size. It depends on your datafile, redolog files and control files. U try this query. It will give you DB size.

Select sum(bytes/(1024*1024)) from dba_data_files.

This will give DB size in terms of GB.

[Mark_Woz]

If you have'nt yet created your database, you need to do
a proper table sizing exercise, to guesstimate the amount of disk space you will need.
Some Things to consider Per Table :
1. No of bytes per row
2. Number of rows initially, and add the forecasted growth of the table - saves you having to add datafiles all the time, and
avoid fragmentation
3. Number and size of indexes