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ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME -----------------------------------------------------------------------------TEST BIN$oGZbms6pRa6xlbFglGjgUw==$0 TABLE 2008-06-27:13:13:58 SQL> As you can see, the TEST table, after it s dropped with the DROP TABLE command, is automatically renamed by the database and stored in the Recycle Bin.
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SHOW USER Command
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The SHOW USER command shows the currently logged in username. SQL> SHO USER USER is "SYSTEM" SQL>
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SHOW SGA Command
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The SHOW SGA command shows the current allocations of the SGA memory. SQL> SHO SGA Total System Global Area Fixed Size Variable Size Database Buffers Redo Buffers SQL> 452984832 1309568 237765760 209715200 4194304 bytes bytes bytes bytes bytes
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SHOW PARAMETERS Command
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The SHOW PARAMETERS command lists all the current default and nondefault values of the initialization parameters. SQL> SHO PARAMETERS NAME --------------------------O7_DICTIONARY_ACCESSIBILITY . . . SQL> TYPE -------boolean VALUE -----FALSE
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You can also issue the SHOW PARAMETERS command to view a specific type of initialization parameter, as shown here: SQL> SHOW PARAMETERS MEMORY NAME -----------------------------------hi_shared_memory_address memory_max_target memory_target shared_memory_address SQL> TYPE ----------integer big integer big integer integer VALUE -----0 820M 820M 0
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You can use the SHOW SPPARAMETER command to view all initialization parameters listed in the SPFILE, as shown in the following example:
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SQL> SHOW SPPARAMETER db_name SID NAME TYPE VALUE -------- ----------------------------- ----------- ----------* db_name string orcl SQL>
SHOW ERRORS Command
The SHOW ERRORS command is useful for seeing the compilation errors associated with a procedure or function. You run the command immediately after you compile the PL/SQL unit. If there are no errors, you ll see the following: SQL> SHO ERRORS PROCEDURE TEST_PROC NO ERRORS. SQL>
Key SQL*Plus Working Commands
All the work you do in SQL*Plus, whether you are issuing simple commands or elaborate scripts to gather information from the database, involves knowing how to use two basic kinds of SQL*Plus commands. The commands in the first group are those that actually do something and can be called the group of working commands for example, the RECOVER command recovers a database. The commands in the second group are formatting commands, and they will help you get clean output from your queries. You ll learn about the most important of both kinds of commands in this chapter. In this section you ll look at the commands that do something, and the formatting commands will be covered in the Commands for Formatting Output and Reporting section, later in the chapter.
SQLPROMPT Command
As a DBA, you ll more than likely be working on several databases. When you re performing multiple tasks during the day, it s very easy to forget which database you re connected to from a particular SQL*Plus session. To avoid committing blunders (such as dropping production tables instead of development or testing tables), you should always set your environment so that the instance name shows up on your prompt every time, reminding you exactly where you are. You can use the following command, which uses the special CONNECT_IDENTIFIER predefined variable to help you set your SQL*Plus prompt to show the database name (predefined variables are discussed in the Predefined SQL*Plus Variables section, later in this chapter): SQL> SET SQLPROMPT '_CONNECT_IDENTIFIER > ' nick > Notice how the SET command changes your prompt immediately in the SQL*Plus interface. When you use this command, your prompt will no longer be the generic SQL> prompt it will instead be the more meaningful DBNAME > prompt, which will always remind you which database you are in without you having to make any dangerous guesses. In this example, the database name is nick. You can use other special predefined variables to set your SQL*Plus prompt. For example, you can make the prompt display the username, as shown here: SQL> SET SQLPROMPT "_USER > " APPOWNER >
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If you wish to see both the database name as well as the current user s name, you can do so with the following command, which uses the _USER and _CONNECT_IDENTIFIER variables: SQL> SET SQLPROMPT "_USER'@'_CONNECT_IDENTIFIER > " APPOWNER@nick > The following prompt uses the _PRIVILEGE and _USER predefined variables to show the current user s name and the privilege the user logged in with: SQL> SET SQLPROMPT SYS AS SYSDBA> "_USER _PRIVILEGE> "
The following formulation shows the username, current date, and the database name (nick), using the three predefined variables _USER, _DATE, and _CONNECT_IDENTIFIER, respectively: SQL> SET SQLPROMPT "_USER 'on' _DATE 'at' _CONNECT_IDENTIFIER > " SYS on 20-JUN-05 at nick> If you wish, you can incorporate the preceding line in your login.sql file, which will set your session values every time you log in, instead of having to reset them manually each time.
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