Could you preserve the constraints and indices if you do somthing similar
like
create table temp as select * from table1 nologging
TRUNCATE table table1
ALTER TABLE table1
NOLOGGING;
ALTER TABLE table1 MODIFY(column...);
Do a direct load insert
ALTER TABLE table1
LOGGING;
DROP TABLE temp
I have not done direct load insert but read it can be done for NOLOGGING
Rick
DENNIS WILLIAMS
<DWILLIAMS@LIFE To: Multiple recipients of list ORACLE-L
TOUCH.COM> <[EMAIL PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: RE: Suggestions solicited -
Change Column
m Datatype from Number to
10/24/2002
04:35 PM
Please respond
to ORACLE-L
Deepak, If there are many columns on these tables, your method may be best.
However, this will generate a lot of redo. You can usually accomplish this
with a CTAS nologging, which won't generate redo. If you really don't want
to change the location, you can:
create table temp as select * from table1 nologging
drop table table1
create table table1 (column, column . . . ) as select * from temp
nologging
drop table temp
Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Thursday, October 24, 2002 3:15 PM
To: Multiple recipients of list ORACLE-L
We have a need to change the datatype of several columns in a table from
number to varchar2. Most of the rows have data in these columns hence a
direct 'alter table ...' will not work.
We plan to create a temp table, move the data from these colums to that
table, modify the column datatype from number to varchar2 and then update
the colums with the data that was moved to the temp table.
Any suggestions/comments or a better way to do this ? Oh, and we are on
8.1.7.1
thanx
deepak
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