October 1998
Intermediate to advanced
456 pages
12h 42m
English
Content preview from Oracle Security
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The Instance and the Database: Starting an Oracle Database
Many
people use the terms
instance and database
interchangeably, but the instance and the database are actually
separate entities. Let’s look at what happens when the database
is started from the Server Manager utility
(svrmgrl, svrmgrm, or
svrmgr30 for Oracle8 on Windows NT). The startup
process follows:
The background processes are started.
The System Global Area (SGA) is allocated in memory.
The background processes open the various files.
The database is ready for use.
During the startup, messages are displayed that notify you of what is happening. Here is a sample startup sequence:
SVRMGR> startup ORACLE instance started. Total System Global Area 11865072 bytes Fixed Size 33708 bytes Variable Size 10672196 bytes Database Buffers 1126400 bytes Redo Buffers 32768 bytes Database mounted. Database opened.
You can see that the instance is started before the files that constitute the database are opened. The instance consists of the background processes and the SGA. The SGA totals are listed before the database is started but after the “ORACLE instance started” message. The database is the collection of logical objects and physical files necessary to support the system, and the database system is the instance, SGA, and files. Figure 2.1 shows the components of the database system after the database has been started.
Figure 2-1. Components ...
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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.
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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.