On 11/25/06, Arnau <arnaulist@xxxxxxxxxxxxxxxxxx> wrote:
Hi all, I have a table with statistics with more than 15 million rows. I'd like to delete the oldest statistics and this can be about 7 million rows. Which method would you recommend me to do this? I'd be also interested in calculate some kind of statistics about these deleted rows, like how many rows have been deleted for date. I was thinking in creating a function, any recommendations?
a function, like an sql statement, operates in a single transaction and you are locking quite a few records in this operation. merlin's 3rd rule: long running transactions are (usually) evil. my gut says moving the keeper records to a swap table, dropping the main table, and swapping the tables back might be better. However, this kind of stuff can cause problems with logged in sessions because of plan issues, beware. do not write a function to delete records row by row unless you have exhausted all other courses of action. merlin
