From the course: Oracle Database 12c: Administration
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Startup - Oracle Database Tutorial
From the course: Oracle Database 12c: Administration
Startup
- [Instructor] Let's talk about the Oracle Database startup and shutdown sequence. Yep, it's a sequence, not a single on or off state. There are actually multiple steps involved each time you start up or shut down your Oracle Database. Let's start by talking about the startup sequence. When your database is down, that is, offline, it means there is no Oracle instance running on the server. The database files are safe on your database storage, but no one can access your data. When you issue an Oracle startup command, our end goal is to get the instance up and running so that it can read and write data from the Oracle Database storage. This is also known as an open state for the database. The process of reaching an open state for the Oracle Database is as follows: First in the sequence of events leading to an open state, is a nomount state. This is when the Oracle instance has been created in memory, that is, you got the Oracle program running on your server. All of the SGA memory cache…
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