Simple .NET/ASP.NET PDF document editor web control SDK

The three main SQL-related dynamic views are V$SQL, V$SQLAREA, and V$SQLTEXT. You can join these and other views such as the V$SESSION view to find out information relating to current SQL usage in the database (for example, the SQL being executed currently in the database). Here s one such query that lets you see a user s SQL statement: SQL> SELECT a.sid, a.username, s.sql_text FROM V$SESSION a, V$SQLTEXT s WHERE a.sql_address = s.address AND a.sql_hash_value = s.hash_value AND a.username like '&user' ORDER BY a.username,a.sid,s.piece;

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You can use several views to monitor the status of the database. Using some of these views, you can check on any resource contention (for example, the existence of locks and latches).

The V$INSTANCE view gives you the status of your instance. It provides you with the hostname, the database name and version, and the status of the database. Listing 23-32 shows the output of a simple query using the V$INSTANCE view. Note that the status could be one of the following: started, mounted, open, or open migrated. The possible values for the ACTIVE_STATE column are NORMAL, QUIESCED, and QUIESCING. Listing 23-32. Using the V$INSTANCE View SQL> SELECT instance_name, host_name, version, startup_time, 2 status, database_status 3* from V$INSTANCE; INSTANCE_NAME HOST_NAME VERSION STARTUP_TI STATUS DB_STATUS ----------------------------------------------------------------nina prod5 10.2.0.0 07/18/2005 OPEN ACTIVE SQL>

The V$SESSION dynamic performance view is one of the most important monitoring- and performance-related views. The view shows an enormous amount of detail about the user session, including the following items:

the libraries to each machine when changes are made. This is viable only if you have an environment with only a few systems. If you have a heterogeneous environment, you will always have to cope with minor differences from OS to OS or even between different versions of the same OS. A standard library is a good way of dealing with those differences and keeping your scripts portable.

Session ID and serial number Username Command in progress The status of the session, whether active, killed, and so on Operating system user ID and machine name SQL ID and SQL hash value for the SQL statement that s being executed Blocking session information Wait information The following script gives you the SID and serial number of a user, in case you want to kill the session for some reason: SQL> SELECT sid, serial#, 2 username FROM v$session 3 WHERE username ='&username'; Enter value for username: HR old 3: where username ='&username' new 3: where username ='HR' SID SERIAL# USERNAME ---------- ---------- ---------22 19167 HR SQL>

The V$LOCK view indicates the session holding the lock and the type of lock that s being held or requested. The two key columns in this view are the LMODE column, which tells you the mode in which a session holds the lock, and the REQUEST column, which specifies the mode in which a different session requests the lock. For both the LMODE and the REQUEST columns, you should translate the numerical lock mode according the following list, which orders the locks from least to most restrictive: Lock mode 0: None Lock mode 1: Null (NULL) Lock mode 2: Row lock shared (SS) Lock mode 3: Row lock exclusive (SX) Lock mode 4: Shared lock (S) Lock mode 5: Shared lock row exclusive (SSX) Lock mode 6: Exclusive (X) Here s the output of a query using the V$LOCK view: SQL> SELECT sid, type,lmode, request FROM V$LOCK; SID TY LMODE REQUEST ------ -- ---------- -------2 MR 4 0 2 MR 4 0 2 MR 4 0 2 MR 4 0

Since System::Object acts as the lowest common denominator of almost all NET types, there are certain similarities to void*, which is the lowest common denominator of all C++ pointer types However, System::Object is much more powerful than void* System::Object provides a set of methods that is available for all expressions resulting in NET types These methods are as follows: ToString: This is a virtual function that returns a string that represents the object The default implementation provided by System::Object simply returns the name of the object s type Many types in the FCL provide an overload for this function For example, System::Enum, the base class of all managed enums, overloads ToString so that the string literal of the current value is returned The ToString overload of System::String simply returns the string value GetType: This function is the entry point to the very powerful runtime type information features of NET.

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