Locking in R3

Hi All,

I have a doubt , oracle by itself incorporates row level locking. Since SAP R3 runs on top of it the update queries should also incorporate row level locking.

I feel row level locking dont stay for long on a database after the record has been updated.

Then how can there be 8 thousand lock entries in a given point of time in a system. These locks do stay for more than 9 to 10hrs at times.

Kindly provide some links to understand this concept. These lock entries are not following row level locking?

Thanks,

Swadesh