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Note that the TYPE column tells you whether an alert is stateful or stateless. Refer to 18 for an explanation of stateful and stateless alerts. The SCOPE column determines whether the alert is database wide or instance wide.

run NTP implementations. Also, clocks on some aging hardware keep such poor time that even NTP can t keep them in sync. NTP implementations can generally keep system clocks synchronized, but if a particular clock drifts beyond the panic threshold, NTP will not update the clock. Additionally, even where NTP is ubiquitous, systems can fail.

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The V$FILEMETRIC view shows file metrics for the most recent ten-minute time interval. The V$FILEMETRIC_HISTORY view shows you file metrics for the past one hour in ten-minute intervals.

If code is compiled with /clr, the System::Object methods can be called on any expression that evaluates to a managed type An expression of type std::string is obviously not a managed type; therefore it is illegal to call one of the methods mentioned previously on an expression that evaluates to std::string However, in managed compilation, literals for Boolean and numeric values are of managed types The following code uses this feature: // managedExpressionscpp // build with "cl /clr managedExpressionscpp" using namespace System; int main() { System::Console::WriteLine((3+39)ToString()); System::Console::WriteLine((42)GetType()); } Even though it seems so, the int literals 3 and 39 are not simply literals of the native type int Because the file is compiled to managed code, these literals are of managed primitive types The expression (3+39) is also of a managed primitive type; therefore ToString can be called on it.

Several dynamic performance views provide general information about the database, such as the version of the database, the database name, the initialization parameters specified in the initialization file, and the default parameters. These views are useful for quickly finding out the value of an initialization parameter, for example, instead of having to look into the init.ora file or the SPFILE.

The V$FIXED_TABLE view comes in handy when you want to see what dynamic performance views are available in your database. This view is to dynamic performance views what the DICT view is for the static data dictionary views.

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>

The following Days Since Epoch script calculates the number of days between two dates. The valid dates for this equation (taken from the Gregorian calendar) range from October 15, 1582 to December 31, 9999. Dates outside this range (or dates from different calendars) require a different equation. This script is a fairly longhand way of getting these values, but the benefit is that it will run on most any system using ksh or bash. The alternatives may not. The script is based on the following formula. When the program runs, it calculates and displays the number of days that have elapsed since January 1, 1970 by determining the number for 1/1/1970 and subtracting that from the number for the current date.

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:

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>

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