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In these examples, user is the username and pwd is the password The connect_alias is a network identifier, fully described in 4 The first example is normal, data dictionary authentication Oracle will validate the username/password combination against values stored in the data dictionary The database must be open, or the connect will fail Anyone connecting with this syntax cannot, no matter who they are, issue startup or shutdown commands The second two examples instruct Oracle to go to the external password file to validate the username/password combination The last two examples use operating system authentication; Oracle will go to the host operating system and check whether the operating system user running SQL*Plus is a member of the operating system group that owns the Oracle software, and if the user passes this test, they will be logged on as SYSDBA or SYSOPER without any need to provide a username and password A user connecting with any of the bottom four syntaxes will be able to issue startup and shutdown commands and will be able to connect no matter what state the database is in it may not even have been created yet Note that the first three examples can include a network identifier string; this is necessary if the connection is to be made across a network Naturally, this is not an option for operating system authentication, because operating system authentication relies on the user being logged on to the machine hosting the Oracle server: they must either be working on it directly or have logged in to it with telnet, secure shell, or some similar utility TIP From an operating system prompt, you can save a bit of time and typing by combining the launch of SQL*Plus and the CONNECT into one command Here are two examples: sqlplus / as sysdba sqlplus sys/oracle@orcl as sysdba Database Control will, by default, attempt to connect through a listener, but it can also use operating system authentication If the situation is that depicted in Figure 3-4, clicking the STARTUP button will require operating system logon credentials to be entered in order to proceed If the listener is running, Database Control will present the login window shown in Figure 3-6 The Connect As list of values lets you choose whether to make a normal connection or a SYSDBA connection.

These are privileges with special capabilities They can only be enabled when users are connecting with an external authentication method: either operating system or password file SYSOPER has the ability to issue these commands:

To make the Selected state active when the web page is first loaded into the web browser, such as when the user has clicked a link from the home page and is now viewing the corresponding page, double-click the area s name in the Rollovers palette and select Use As Default Selected State below Selected

STARTUP SHUTDOWN ALTER DATABASE [MOUNT | OPEN | CLOSE | DISMOUNT] ALTER [DATABASE | TABLESPACE] [BEGIN | END] BACKUP RECOVER

The SYSDBA privilege includes all of these, but in addition has the ability to create a database, to perform incomplete recovery, and to create other SYSOPER and SYSDBA users EXAM TIP SYSDBA and SYSOPER are not users; they are privileges that can be granted to users By default, only user SYS has these privileges until they are deliberately granted to other users You may be wondering what Oracle user you are actually logging on as when you use operating system authentication To find out, from a SQL*Plus prompt connect using the operating system authentication syntax already shown, and then issue the show user command (which can be abbreviated to sho user never underestimate the importance of saving keystrokes) as shown in the examples in Figure 3-7 Use of the SYSDBA privilege logs you on to the instance as user SYS, the most powerful user in the database and the owner of the data dictionary Use of the SYSOPER privilege connects you as user PUBLIC PUBLIC is not a user in any normal sense it is a notional user with administration privileges, but (by default) has no privileges that lets it see or manipulate data You should connect with either of these privileges only when you need to carry out procedures that no normal user can perform

When you have additional states visible in the Rollovers palette, it s time to edit how the image looks in each of those states This process is very similar to adding animation frames click the state in the

Remember that the instance and the database are separate entities that exist independently of each other When an instance is stopped, no memory structures or background processes exist and the instance ceases to exist, but the database (consisting of files) endures Indeed, in a RAC environment other instances on other nodes could exist and connect to the database The startup process is therefore staged: first you build the instance in memory, second you enable a connection to the database by mounting it, and third you open the database for use At any moment, a database will be in one of four states: SHUTDOWN NOMOUNT MOUNT OPEN When the database is SHUTDOWN, all files are closed and the instance does not exist In NOMOUNT mode, the instance has been built in memory (the SGA has been created and the background processes started, according to whatever is specified in its parameter file), but no connection has been made to a database It is indeed possible that the database does not yet exist In MOUNT mode, the instance locates and reads the database control file In OPEN mode, all database files are located and opened and the database is made available for use by end users The startup process is staged: whenever you issue a startup command, it will go through these stages It is possible to stop the startup partway For example, if your control file is damaged, or a multiplexed copy is missing, you will not be able to mount the database, but by stopping in NOMOUNT mode you may be able to repair the damage Similarly, if there are problems with any datafiles or redo logfiles, you may be able to repair them in MOUNT mode before transitioning the database to OPEN mode