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During a given SQL*Plus session, it s likely that you ll need to change your environment settings in order to run a specific SQL script or command. If you want to preserve these settings for future use, you can do so with the help of the STORE command. The following example shows how to use the STORE command to save your SQL*Plus environment settings: SQL> STORE SET mysqlplus.sql Created file mysqlplus.sql SQL> Once you store your favorite environment variables in a file, you can easily reuse them anytime you want by simply executing the script. (I explain the execution of SQL scripts in the following sections.) The STORE command can be used with three options: CREATE, REPLACE, or APPEND. The default is CREATE, which creates a new file. If you wish to replace an existing file and store your SQL*Plus commands there, use the REPLACE option. If you wish to add the commands to an existing file, use the APPEND option.

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You can use the SHOW command to display variable values. To find out the individual values, you type in the specific variable s name, as shown in the following example: SQL> SHOW TTITLE ttitle ON and is the following 49 characters: Annual Financial Report for the Women's Club, 2005 SQL> The SHOW ALL command will show you the current settings for all the SQL*Plus environment variables. I briefly explain some of the most important options for the SHOW command in the following sections.

One of the most useful SQL*Plus commands in Oracle Database 10g is the SHOW RECYCLEBIN command. This command will let you see if there are any tables that are eligible for a recovery using the FLASHBACK TO BEFORE DROP command. If you drop a table, that table doesn t go away immediately it stays in the Recycle Bin until you either get rid of it permanently with the DROP TABLE PURGE command, or the database faces space pressure. I discuss the Flashback Table feature in detail in 6, but here s what you ll see if there is an eligible table stored in the Recycle Bin:

ata redirection is when the input or output of a command is redirected using special notation. It is also used for opening and closing files for read and write operations. The forms and syntax of redirection are varied and their meanings are specific. I will cover some of the common uses here, and provide a bit more explanation than system man pages to aid you in avoiding pitfalls.

SQL> CREATE TABLE test (name varchar2(30)); Table created. SQL> DROP TABLE test; Table dropped. SQL> SHOW RECYCLEBIN ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME -----------------------------------------------------------------------------TEST BIN$oGZbms6pRa6xlbFglGjgUw==$0 TABLE 2005-06-27:13:13:58 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.

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

For unmanaged-to-managed transitions, there is no potential for improving the performance of the generated thunks There are no hidden keywords or attributes that can be used for optimizations of transitions in this direction An unmanaged-to-managed thunk has to perform certain expensive operations For example, it is possible that a managed function is called by a thread that has not yet executed managed code The unmanaged-to-managed thunk must be prepared for that case so that a native thread will be automatically promoted to a managed thread before the managed function is called In case of a mixed-code DLL, it is also possible that the managed part of the assembly has not been initialized In this case, the thunk has to ensure the managed initialization You cannot optimize the performance of unmanaged-to-managed thunks Your only optimization option is to reduce the number of unmanaged-to-managed transitions.

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

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>