locks and locks - an example?

Hi guys,.

I keep coming across these two terms, and I'm trying to conceptualize their. I understand why locks are needed on the resources (to me, this means tables, index, lines, sequences etc - maybe something else?). But I don't really know how to locks and latches should go. I have collected the following Googling autour.

VALVES:

Provide exclusive access only to the protected data structures
Request are not aligned, if a request fails, process, try later
Simple data structure
Protect the resources that are briefly required (LRU list)
Very effective

LOCKS:

Allow serialized access to some resources
Lock requests are queued and serviced by order
Complex data structure which is still protected by latch
Protect the resources for a long period (e.g. tables)
Less effective


If someone could give me a simple example to tell a very simple table and show how the lock and the lock will interact for a query on the table, it would help me a lot.

Thank you.

Dear Oracleguy777,

Your welcome at any time, and Yes, this article of H.tonguc YIlmaz is excellent.

Soon :)

Francisco Munoz Alvarez
www.oraclenz.com

Tags: Database

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