I need some help calculating how much activity a query causes. If I have a table defined as: create table test_a ( col1 integer, col2 char(1), col3 varchar(35), primary key (col1,col2) ) with oids;
When I do an "insert into test_a values (1,'a','test data');", does this generate 3 writes (1 to table, 1 to index, and one to oid counter) and one read (get oid from oid counter)? What about when I do an "update test_a set col3='changed data' where col1 = 1 and col2 = 'a';"? I am thinking 5 writes (1 to old table tuple, 1 to old index tuple, 1 to oid counter, 1 to new table tuple, one to new index tuple) with 1 read (get oid from oid counter)? Finally, what about the delete "delete from test_a where col1=1 and col2='a';"? 2 writes (1 to table tuple, and 1 to index tuple)? I am just trying to get a grasp on how much traffic I am creating for each major dml statement we issue so that I can work with my sysadmin on some i/o issues. Thanks, Chris PG 8.1 RH 4 -- Come see how to SAVE money on fuel, decrease harmful emissions, and even make MONEY. Visit http://colafuelguy.mybpi.com and join the revolution!
