if (hxyz) { ::XYZDisconnect(hxyz); hxyz = 0; } } } !XYZConnection() { // do not call any finalizable objects here, // they are probably finalized already! if (hxyz) ::XYZDisconnect(hxyz); } ... }; Apart from some really rare exceptions, you should implement finalization logic only in classes that wrap native resources. A class that implements finalization logic should always implement a destructor for normal cleanup, too. Often the destructor is implemented by simply forwarding the call to the finalization function. When implementing finalization logic, do not make assumptions about the thread that performs the finalization. The current CLR implementation uses a special thread that is dedicated to calling the finalizers. However, the CLI does not specify how finalization should be implemented with respect to threads. In future versions, there may be more than one finalizer thread to ensure that finalization does not end up in a bottleneck.

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The options are cputime, which measures the number of minutes the cpu has allocated to the process; etime, which is the elapsed time in minutes since the process began running; pcpu which represents the current percentage of the CPU capacity the process is consuming; and vsize, which shows the virtual-memory size in kilobytes for the process The third and fourth fields contain the desired lower and upper thresholds for the indicator you re tracking The fifth and final field is the kill option It is a value from 0 to 3: 0: Send a notification when either the low warning or high error threshold have been crossed, but don t kill the process 1: Send a warning notification when the low threshold has been crossed or an error notification when the high threshold has been crossed, and kill the process.

SQL> DESC V$RECOVERY_PROGRESS Name -------------------------------------------TYPE /* type of recovery operation */ ITEM /* the item name */ SOFAR /* Work completed so far */ TOTAL /* Total expected amount of work */ SQL>

The V$ADVISOR_PROGRESS view shows details about the progress of various advisor job executions (for example, the SQL Tuning Advisor). Here s a simple query you can use to check the progress of an ongoing SQL Tuning Advisor job: SQL> SELECT sofar, totalwork FROM V$ADVISOR_PROGRESS WHERE user_name = 'SALAPATI' AND task_name = 'TEST_TUNING_TASK';

You normally use the V$ACCESS view in conjunction with the V$SESSION view to gather information about which users are accessing a given database object. Here s the view: SQL> DESC V$ACCESS Name Null Type ----------------------------------------- ----- -------------SID NUMBER OWNER VARCHAR2(64) OBJECT VARCHAR2(1000) TYPE VARCHAR2(24) SQL>

The dynamic performance views are excellent for monitoring the redo log and the archive log usage. The following sections present some of the key performance views relating to logs, both online and archived.

2: Send only a low-level warning notification when either the low or high threshold has been crossed, and kill the process 3: Kill the process without any notification at all Note that for safety, if the kill option is not set or is set to anything but one of the values outlined here, processes will not be killed Notice that there are two levels of notification I have used alphanumeric paging for the high level (error status) and e-mail for the low level (warning status) You may want to implement the notification method as appropriate for your needs The first section of the script sets up a few configuration variables, which alternatively could be stored in a separate configuration file and sourced each time the script runs through the loop This would allow for live configuration changes to the script.

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.

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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