Set auto commit to false

Question

Hi
I have problems with multiple updates causing a Block in the database.In order to solve this I am trying to set commits to false and true explicitly before and after updates.Since I am performing updates within a loop I would like to know if I need to explicitly inside the loop.
For eg can i do something like this
for (int i = 0;i < part_Vect.size() ;i++) {
conn.setCommit(false);
sql = Update stmt;
stmt.executeUpdate(sql);
conn.setCommit(true);
} // end loop
or should i set the commits outside the loop
Thanks
Arn

Answer 1

Most of the time I'd put the commit related stuff outside of the loop to reduce the number of database calls and guarantee data integrity. There are a couple of factors to consider though.
1. Whether you want all the updates to be committed in one transaction. If there is a failure in the middle of your operation, is it ok if some updates have been performed and others have not. Can you restart and recover correctly? If you need a single transaction, then the commit code should be outside of the loop.
2. The number of updates. The more updates there are in a transaction, the more database locks will be required and the greater the performance hit. The limit depends on your configuration and access needs. If there are several thousand updates and many other users who need to read the data, a different design may be required.