Anish,
So my problem of retrieving 1,000,000 random records 1,000,000 times works fine for 15 bytes. But it is taking too long a time for 1k records. It is almost taking 102 seconds for retrieving 50,000 records of size 1k. Can u suggest me a way for reducing the time taken for the same? I have'nt done any changes in my program. The only change I made was adding primary key to the seq_number column in my data insertion program.
My guess is that with 15 byte records you operating system keeps the entire database in the file cache and no real IO is done. When you use the 1k records, the entire database does not fit into memory anymore, and therefore real IO is done. That slows database access dramatically down. I guess if you watch the CPU usage in the 15 byte case, its close to 100% and in the 1k case it's very low (an you have a lot of disc access). Michael
