.NET/ASP.NET/C#/VB.NET PDF Document SDK

If you want to find out quickly the version of your database software and its various components, use the query shown here: SQL> SELECT * from V$VERSION; BANNER ---------------------------------------------------------------Oracle Database 10g Enterprise Edition Release 10.2.0.0 - Beta PL/SQL Release 10.2.0.0 - Beta CORE 10.2.0.0 Beta TNS for Linux: Version 10.2.0.0 - Beta NLSRTL Version 10.2.0.0 - Beta SQL> V$DATABASE is another important view that provides information about the status of the running instance. The following is the output of a typical query using the V$DATABASE dynamic view: SQL> SELECT name,created, 2 log_mode,open_mode,protection_mode, 3* database_role FROM V$DATABASE; NAME CREATED LOG_MODE OPEN_MODE PRO_MODE DATABASE_ROLE --------- --------- ------------ ---------- -------- ------------ORCL 25-JUL-05 NOARCHIVELOG READ WRITE MAX PERF PRIMARY SQL> The V$DATABASE view is useful when you re dealing with standby databases. The view contains information on the protection mode, switchover status, protection level, guard status, and other critical information that you need to manage standby databases. The V$DISPATCHER view provides information on the dispatcher processes in the instance.

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For the managed int primitive, ToString is overloaded to return the string literal of the current value In this case, it is 42, which will be written to the console Since (42) is a managed expression, too, you can also call GetType on it As described previously, GetType returns a NET type information object When such a type information object is passed to Console::WriteLine, a different overload of this method is called This method internally calls ToString on the object passed The NET type information object s ToString method simply returns the type name The output that this sample application writes to the console is probably surprising: 42 SystemInt32 The managed int literal is in fact different from a native one It is an instance of a type with the name SystemInt32 This type inherits methods like ToString and GetType from System::Object.

If you want to find out which Oracle database options are enabled in your database, you can query the V$OPTION dynamic view. Listing 23-34 shows a (partial) query using the V$OPTION view. Listing 23-34. The V$OPTION View SQL> SELECT * FROM V$OPTION; PARAMETER VALUE -----------------------------------------------------Partitioning TRUE Objects TRUE

(Year*365)+(Year/4)-(Year/100)+(Year/400)+(Month*306001/10000)+(Day)

Real Application Clusters Flashback Database Data Mining Scoring Engine . . . 52 rows selected. SQL>

The V$SYSTEM_PARAMETER dynamic view lists all the initialization parameters that are currently in effect for the session. The V$SYSTEM_PARAMETER2 view is similar, except that it lists multiple values of parameters in case they exist.

The V$PARAMETER view shows you the initialization parameters that are in effect for a given session. The view inherits all the parameter values from the V$SYSTEM_PARAMETER instance view. There s also a V$PARAMETER2 view, and it s the counterpart of the V$SYSTEM_PARAMETER2 view. Listing 23-35 describes the V$PARAMETER view. Listing 23-35. Querying the V$PARAMETER View SQL> DESC V$PARAMETER Name Null Type ----------------------------------------- -------- -------------NUM NUMBER NAME VARCHAR2(80) /* name of the parameter TYPE NUMBER VALUE VARCHAR2(512) /* value of the parameter DISPLAY_VALUE VARCHAR2(512) ISDEFAULT VARCHAR2(9) /* if TRUE, parameter is set to default */ ISSES_MODIFIABLE VARCHAR2(5) /*can be modified using ALTER SESSION ISSYS_MODIFIABLE VARCHAR2(9) /*can be modified using ALTER SYSTEM ISINSTANCE_MODIFIABLE VARCHAR2(5) ISMODIFIED VARCHAR2(10) /* been modified since instance startup */ ISADJUSTED ISDEPRECATED DESCRIPTION UPDATE_COMMENT HASH SQL> VARCHAR2(5) VARCHAR2(5) VARCHAR2(255) VARCHAR2(255) NUMBER /* has Oracle adjusted user-set value */ /* description of the parameter */