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The V$LOG view provides detailed information about the online redo logs. It s useful for finding out two important things: the log status and whether it has been archived. Log status could take one of the following values: Unused: The log is either new or it s being used right after a reset logs operation. Current: The current, active redo log. Active: An active log, but not one currently in use. Inactive: Instance recovery doesn t need this log.

A process P1 wishes to send a command to a process P2. P1 needs progress feedback as soon as P2 has any status information available.

Here s the output of a query using the V$LOG view: SQL> SELECT group#, thread#, sequence#, archived, 2* status FROM V$LOG; GROUP# THREAD# SEQUENCE# ARC ---------- ---------- ---------- --1 1 11 NO 2 1 9 NO 3 1 10 NO SQL> STATUS -------CURRENT INACTIVE INACTIVE

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That means the Top 5 report is showing us only the tip of the iceberg with regard to latching issues the 229,537 misses (which means we spun trying to get the latch) are not revealed in the Top 5 report for us After examination of the Top 5 report, we might not be inclined to think We have a hard parse problem here, even though we have a very serious one To perform 2 units of work, we needed to use 3 units of CPU This was due entirely to the fact that we need that shared resource, the Shared pool such is the nature of latching However, it can be very hard to diagnose a latching-related issue, unless we understand the mechanics of how they are implemented A quick glance at a Statspack report, using the Top 5 section, might cause us.

The V$LOGFILE view provides information about each redo log file, including its name and whether the file is valid or not. The STATUS column has the following values: INVALID if the file isn t accessible STALE if the contents are incomplete NULL if the file is currently in use DELETED if the file isn t used any longer The following is a query on the V$LOGFILE view showing the status and name of the redo log files. Because its STATUS column is blank, group 1 (with one member) is the currently used redo log group. SQL> SELECT * FROM V$LOGFILE; GROUP# STATUS TYPE MEMBER ---------- ------- ------- ------------------------------3 STALE ONLINE C:\ORACLE\ORADATA\MARK1\REDO03.LOG 2 STALE ONLINE C:\ORACLE\ORADATA\MARK1\REDO02.LOG 1 ONLINE C:\ORACLE\ORADATA\MARK1\REDO01.LOG SQL> The V$LOG_HISTORY view shows you all the logs from the beginning log to the latest one, along with the high and low SCNs in each redo log.

The V$ARCHIVED_LOG view is essential when you re looking at information regarding which archive logs you have access to. The view contains one entry for every log that your database archives. When you restore an archive log, the operation inserts one row into the view for each archive log. Listing 23-29 show the output of a query using the view. Listing 23-29. Querying the V$ARCHIVED_LOG View SQL> SELECT name, thread#, sequence#, 2 archived, applied, deleted, completion_time 3* FROM V$ARCHIVED_LOG; NAME THREAD# SEQ# ARC DEL COMPLETION_TIME -----------------------------------------------------------------C:\ORACLENT\RDBMS\ARC00001.001 1 1 YES NO 07/07/2005 C:\ORACLENT\RDBMS\ARC00002.001 1 2 YES NO 07/07/2005 C:\ORACLENT\RDBMS\ARC00003.001 1 3 YES NO 07/07/2005

Forces When intermediate status information is needed during the processing of a command, the caller may not know how often to request status, possibly because the command entails a widely varying number of steps or amount of processing time by the callee. It is wasteful for the caller to poll the callee continuously, because this taxes the callee while the callee is already busy. Moreover, the caller might miss a status update, if feedback isn t polled fast enough. A safe approach is to put the burden of status reporting on the callee, with a push model.

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