What does sqlplus/nolog mean?

What does sqlplus/nolog mean by sqlplus Command Format: www.2cto.com usage: SQLPLUS [[<option>] [<logon>] [<start>] Where <option> :: =-H |-V | [[-M <o>] [-R <n>] [-S] <login> :: = <User Name> [/<password>] [@ <connect_string>] |/NOLOG <start >:=@ <File Name> [. <ext>] [<parameter>...] "-H" display SQL * Plus version labels and Syntax "-V" display SQL * Plus version labels "-M <o>" Use HTML flag options <o>" -R <n> "uses restricted mode <n>"-S "uses silent mode/nolog means not logging on to the database server. If no/nol Og parameter. sqlplus will prompt you to enter the user name and password. If you use the shutdown command in the SQL * plus environment to close the database, you must first enter the sqlplus environment without logging on to the database server, and then run the startup command to start the database. If the database is not started, you cannot log on to the database or verify the user name and password. Www.2cto.com sqlplus/nolog -- run the sqlplus command to enter the sqlplus environment. The nolog parameter indicates no logon; SQL> connect/as sysdba -- connect to the database as a system administrator (sysdba; if you need to manage the database, You need to log on to the database in this way, or connect sys @ service_name as sysdba, where service_name is the customer's tnsname service name you configured. SQL> startup -- if the database is not started, data 1, sqlplus '/as sysdba' and 2 will be started normally after the above steps are connected, sqlplus/nolog SQL> connect/as sysdba 1 and 2 are the same meaning