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Alternatively, using the method syntax, you can set the format options for two separate reports:

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:

use FileHandle; DETAILS->format_top_name("Detailed Phone Statistics"); SUMMARY->format_top_name("Summary Phone Statistics");

This virtually eliminates the need for select altogether, but it remains for historical compatibility

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

You can truncate (empty) a specific filehandle to trim it down to a specific size:

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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

Using COM Objects 365 Being Used by COM Objects 365 Calling Native DLL Functions 365 Pointers and Declarative Pinning 366 Structure Layout 369 Calling a Function with a Structure Parameter 369 Fixed-Size Buffers 371 Hooking Up to a Windows Callback 372 Design Guidelines 374.

For example, to reset the size of an error log, perhaps after the full contents have been printed, you can use this line:

truncate LOGFILE, 1024;

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

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