![]() That's why we can rename the data file in this state. That is to say, if you move data files forth and back in this state, the instance complains nothing. Please keep in mind, the instance now knows every file's conditions, but it will not touch them. In this state, the database will additionally need the control file to acknowledge everything about the data files and redo log files, which includes filename, location and checkpoint. Please note that, you can't use the command anywhere but RMAN. When you almost lost all files including SPFILE, you can use the following command to get a dummy instance for later restoration of SPFILE. SQL> startup nomount pfile='/tmp/initORCL.ora' Force If you'd like to start the database with PFILE in a different location, you have to specify the path of PFILE. SQL> select instance_name, status from v$instance In NOMOUNT state, the only view that you can query is V$INSTANCE. Please note that, even though the last semicolon is optional, I'd rather keep the habit to append it to the end of every statement. The located parameter file is not always SPFILE, because Oracle will choose the most proper parameter file by examining their file names to startup the database. The database will locate the parameter file in the default location. We don't have to explicitly specifying the location of SPFILE when issuing STARTUP SQL command. There're several kinds of scenarios to startup a database to NOMOUNT. There's only 1 state that can go to NOMOUNT. ~]$ echo ~]$ echo ~]$ sqlplus / as sysdba ![]() When the database is running, we call it "instance".īefore we can startup an Oracle database from the server, we have to make sure two environment variables are set, which are ORACLE_HOME and ORACLE_SID in. In this state, the database will only need a parameter file which is usually a SPFILE, to allocate processes and get necessary memory from the server. Furthermore, we can use it to deploy our automatic startup scripts in Linux.īy the way, to start Oracle database remotely, you have to know how to connect to an idle, NOMOUNT or restricted database from a remote client. Later in section D, we will talk about how to startup multiple databases in a batch-fashioned way by utilizing Oracle provided script, dbstart. The first part of this post, section A, B and C, we will talk about commands that can switch database states. This is because the database will create new ones for missing temp files during starting up. Please note that, the data files mentioned above include permanent and undo data files, but not temp files. Topographic and Truck maps available for the whole continent and now also map with DEM ( +info).Oracle Database Startup – Required Files to States Database States vs Required Files Database State.Enjoy all African continent in a single map.Iberian Peninsula, South of France and Balearic Islands Includes Denmark, Finland, Norway and Sweden.Topographic and Truck maps also available for all the area. ![]()
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