December 2002
Intermediate to advanced
928 pages
85h 29m
English
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Locks and latches
The following views provide information about the status of locks and latches within the instance:
- *$ACCESS
Lists all locked objects in the database and the sessions accessing these objects.
- *$BUFFER_POOL
Provides information about the available buffer pools. The number of buffer pools is related to the initialization parameter DB_BLOCK_LRU_LATCHES.
- *$ENQUEUE_LOCK
Lists all locks owned by enqueue state objects.
- *$LATCH
Provides statistics for all latches. If the latch is a parent latch, provides a summation of the statistics for each of its children latches. Available after database is opened.
- *$LATCH_CHILDREN
Provides statistics for all children latches.
- *$LATCH_MISSES
Provides statistics about all failures to acquire a latch.
- *$LATCH_PARENT
Provides statistics for all parent latches.
- *$LATCHHOLDER
Provides information about current latch holders.
- *$LATCHNAME
Provides a decoded latch name for every latch listed in *$LATCH. Available after database is mounted.
- *$LOCK
Lists all locks held and all outstanding requests for locks or latches.
- *$LOCKED_OBJECT
Lists all objects currently locked by transactions within the system.
- *$RESOURCE
Contains the names, types, and addresses of all resources in the system.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.