What Is A Latch? How It Is Used In Oracle?

1.	What Is A Latch? How It Is Used In Oracle?
Answer» A latch is a semaphore or an on/off switch in ORACLE database that a process must access in order to conduct certain TYPE of activities. LATCHES govern the usage of Oracle's internal resources by its processes. They enforce serial access to the resources and limit the AMOUNT of TIME for which a single process can use a resource. There are over 80 latches available in Oracle.

Answer»

A latch is a semaphore or an on/off switch in ORACLE database that a process must access in order to conduct certain TYPE of activities. LATCHES govern the usage of Oracle's internal resources by its processes.
They enforce serial access to the resources and limit the AMOUNT of TIME for which a single process can use a resource.
There are over 80 latches available in Oracle.

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