Bryan,
First item is to define "efficient". Are you looking for efficiency in the
update of data on the production database or the standby? The code needed to
determine which columns need updating is going to be a real bear and could create
several update statements per record. On the other hand the standby is going to
expend the same amount of effort one way as the other. Personally I'd update
everything, except the primary key.
Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
-----Original Message-----
Sent: Wednesday, May 28, 2003 11:50 AM
To: Multiple recipients of list ORACLE-L
Hello everyone,
I have a question for the group of which method is more efficient.
To set the stage my company has a process to load part changes from vendors
into the tables in an 8.1.7.4 Oracle database with archiving on and this
database has a standby database at disaster recovery site, so nologging is
not an option.
There is a discussion going on as to which method is more effective for
updating the information in a table. In looking at effectiveness, I am
looking at reducing the amount of redo information produced and having the
database do the least amount of work.
1) Method 1 is to update the information only for the fields that have
changed, 1 field at a time.
2) Method 2 is to update the information for all the fields in the
record whether they have changed or not, 1 record at a time.
The size of the record is 1843 bytes and the distribution of field sizes:
2 fields varchar2(240).
1 field varchar2(150)
15 fields varchar2(50)
1 field varchar2(3)
2 fields varchar2(20)
4 fields varchar2(40)
3 fields varchar2(1)
2 fields varchar2(25)
2 fields number(10,2)
1 field number(13,2)
1 field number(1)
1 field number
1 field varchar2(6)
1 field number (17,2)
1 field varchar2(4)
3 fields that are date.
In the past couple of months the average number of fields changed per record
was 3 to 4 fields per record.
Thanks for your help,
Bryan Rodrigues
Oracle DBA
Elcom, Inc.
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