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The V$FIXED_VIEW_DEFINITION view shows the view definitions for all dynamic performance views. Remember that dynamic performance views are derived from base tables. The V$FIXED_ VIEW_DEFINITION view lists all dynamic performance views along with their definitions, showing you exactly how Oracle is getting the data into that view. For example, you can see how the frequently used V$SGASTAT view is constructed, using the V$FIXED_VIEW_DEFINITION view: SQL> SELECT * FROM V$FIXED_VIEW_DEFINITION 2 WHERE VIEW_NAME='V$SGASTAT'; VIEW_NAME VIEW_DEFINITION ------------------------------------------------------------------V$SGASTAT select POOL, NAME , BYTES from GV$SGASTAT where inst_id = USERENV('Instance') SQL>

materialize multiple versions of the data and is the mechanism by which Oracle provides read-consistent views of data (i.e., consistent results with respect to a point in time). A rather pleasant side effect of multi-versioning is that a reader of data will never be blocked by a writer of data. In other words, writes do not block reads. This is one of the fundamental differences between Oracle and other databases. A query that only reads information in Oracle will never be blocked, it will never deadlock with another session, and it will never get an answer that didn t exist in the database.

The V$LICENSE view contains your Oracle licensing information and informs you about the maximum number of concurrent users or sessions that your license allows. The following code describes the V$LICENSE view:

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SQL> DESC V$LICENSE Name -----------------------------------------------------------------------SESSIONS_MAX /* max permissible concurrent sessions */ SESSIONS_WARNING /* warn limit for concurrent sessions limit */ SESSIONS_CURRENT /* current concurrent sessions */ SESSIONS_HIGHWATER /* max no. of concurrent sessions */ USERS_MAX /* max number of named users */ CPU_COUNT_CURRENT /* current number of CPUs in use */ CPU_COUNT_HIGWATER /* max no. of CPUs in use */ SQL>

Context A process P1 sends a command to a process P2. While P2 is busy executing the command, P1 needs to obtain execution progress information from P2. At any time during command execution, P1 may need to interrupt the transaction. Forces

Note There is a short period of time during the processing of a distributed 2PC where Oracle will prevent

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.

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

read access to information. As this processing is somewhat rare and exceptional (the problem applies only to queries that start between the prepare and the commit phases and try to read the data before the commit arrives), I will not cover it in detail.

Transparent interactions utilize feedback to keep the caller informed of progress the callee makes in processing a command. The caller may utilize the feedback information to decide to abort the operation in progress.

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

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