exp/imp without data creates huge empty db!
HelloI have a db of 8.1.7.4 on windows 2000 400GO
I wanted to exp / imp, but I don't want the data, just the structure and code
So I did
exp x/y@db LEADER = D:\exp_database.dmp LINES = COMPATIBLE N = Y FULL = Y CONSTRAINTS = Y GRANTS = INDEX Y = Y
IMP x/y@db2 FILE = D:\exp_database.dmp ROWS = N FULL = Y CONSTRAINTS = Y GRANTS = INDEX Y = Y Feedback = 1000
the 400GO exported to the file of 7 M, what's good
but when I import the 7 M, it creates a VACUUM 160 GB database!
I see that 'some' of the data files are full size, even it's empty!
no reason for this, is the structure take 40% of the db?
Thank you
The 'COMPRESS' export setting determines how the CREATE TABLE statement must be created.
By default, 'Y' 'COMPRESS' that is, a CREATE TABLE statement is generated with a LEADING period allocated size as large as the table (all extensions of the combined table) - without worrying about whether all lines exist in the table or all lines are exported or all lines are imported.
You export with 'COMPRESS = N. Which generates instructions CREATE TABLE with INITIAL as large as the INITIAL of the exported table report. However, if the source table has an INITIAL definition of, say, 100 M, again, regardless of the number of rows present/imported/exported, the import will be CREATE TABLE with INITIAL of 100M. In these cases, you need to generate the CREATE TABLE statement and create the tables manually.
Hemant K Collette
http://hemantoracledba.blogspot.com
Published by: Hemant K Collette on July 29, 2010 14:00
Tags: Database
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