Free routine, launch database

Starting the database basically can be divided into three processes: 1, Nomount (ie start instance, not load database)

2, mount (loading the database, but not open)

3, Open (place the database in the open state)

After the DBA is executed to ORACLE, execute startup (without parameters), which will make the database in the OPEN state,

Of course, you can also bring the front parameters (such as Startup NonT) to make the database in the required state;

However, the premise of DBA execution Connect operation is Oracle's service (Oracles ) is in the "started" state, (that is, oracleService ) may also be Is it in the "launched" state, but if Oracleservice is not started, the database must not be started.

It should be noted that the Startup operation is performed by default in the "Service" in Windows, which will be placed in the OPEN state (if I have not remembered, you can make it through ORADIM "." Only SERVICE is started when you start ORACleService , and the database does not place the database in the OPEN state).

I think this may be easily confused with "launch Oracles (SID>" and "launching the database (or startup)". I didn't understand it.

If you are not right, everyone is correct. Everyone can discuss it to get "confusing".