October 1999
Intermediate to advanced
136 pages
4h 15m
English
Content preview from Oracle Internals: An Introduction
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Reference
This section contains a quick reference to the parameters, events, statistics, and APT scripts mentioned in Chapter 2.
Parameters
|
Parameter |
Description |
|---|---|
|
_USE_VECTOR_POSTS |
Vector posts enable multiple waiting processes to be posted in a single semaphore operation. |
|
POST_WAIT_DEVICE |
The post-wait driver is a pseudo device driver. Its functions are invoked when operations are performed against a device special file of that device type. Where this parameter is used, it specifies the path to the device file for the post-wait driver. |
|
TIMED_STATISTICS |
Should be set to TRUE whenever timing information may be required for tuning purposes, which is always. |
|
USE_POST_WAIT_DRIVER |
If this parameter exists, it should be set to TRUE in order to use the post-wait driver, instead of regular semaphore operations. |
Events
|
Event |
Description |
|---|---|
|
10046 |
This is the event used to implement the DBMS_SUPPORT trace, which is a superset of Oracle’s SQL_TRACE facility. At level 4, bind calls are included in the trace output; at level 8, wait events are included, which is the default level for DBMS_SUPPORT; and at level 12, both binds and waits are included. See the excellent Oracle Note 39817.1 for a detailed explanation of the raw information in the trace file. |
Statistics
|
Statistic |
Source |
Description |
|---|---|---|
|
total_waits |
V$SYSTEM_EVENT V$SYSTEM_EVENT |
The number of distinct waits. |
|
total_timeouts |
V$SYSTEM_EVENT V$SESSION_EVENT |
The number of waits that timed out instead of being posted. |
|
logical_waits ... |
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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.