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But these scripts are prone to error or at least, misinterpretation For example, the view DBA_FREE_SPACE has one row for every bit of free space in every tablespace But if a tablespace were full, there would be no rows at all; hence the need for the OUTER JOIN, without which the SMALL tablespace would not be listed, even though it is in a critical state Then consider the effect of enabling AUTOEXTEND on the datafiles Also, an UNDO tablespace will usually be 100 percent full but this is not a problem, because a large part of the undo data will be inactive and can be overwritten And what about temporary tablespaces The query would have to be in a UNION with another query against DBA_TEMP_ FILES Many DBAs have written suites of SQL code to report on space usage and raise warnings before error conditions occurred Fine but the scripts had to be written, they

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had to be run regularly, and they had to be updated to take account of changes in technology Many companies have written and marketed tools to do the same thing The Alert system replaces a vast amount of this humdrum work It will monitor many conditions that can cause problems, and will send notifications by a variety of methods With regard to space management, it is by default configured to raise a warning alert when a tablespace reaches 85 percent full and a critical alert when a tablespace is 97 percent full, with account being taken of auto-extension and the nature of the contents Alerts comes in two forms Stateful alerts are based on conditions that persist and can be fixed Tablespace space usage is an example, or the number of sessions hanging, or the average time it is taking to complete a SQL statement execution Stateless alerts are based on events; they happen and are gone A query failing with snapshot too old or two transactions deadlocking are examples To configure the Alert system, you set thresholds The thresholds are stored in the AWR Then the MMON background process will monitor the database and the instance, in real time, and compare the current state with the thresholds If a threshold is crossed, it will raise the alert The mechanism by which an alert is raised is simply to put an entry on the alert queue A queue is a table of messages that other processes can read What happens to the alert message next is a matter for further configuration The default behavior is that Enterprise Manager (either Database Control or Grid Control) will dequeue the message and display it on the database home page, but Enterprise Manager can be configured to send e-mails or SMS messages when it finds that an alert has been raised You can also view the alerts by querying the view DBA_OUTSTANDING_ ALERTS, and it is possible to write an alert handler that will dequeue the messages and take any action desired EXAM TIP Alerts are raised by the MMON process, not by Enterprise Manager Enterprise Manager reads alerts, as can other event handlers written by you or by third parties.

When you save web designs containing slices, the program saves each slice as an independent graphic This means that although you may start with a single-layered Photoshop file, you ll end up with multiple optimized web graphics For example, in the case of the following file used to build a basic navigation system for a web site, I ended up with nine files one logo and eight buttons

There are over 200 metrics for which you can set thresholds They are documented in the view V$METRICNAME, which gives the name of the metric and the units in which it is measured, and the ID number by which it is identified There is an API (the DBMS_SERVER_ALERT package) for setting thresholds For example:

1 2 3 4 5 6 7 8 9 10 11 execute dbms_server_alertset_threshold(metrics_id=>dbms_server_alertredo_generated_sec,warning_operator=>dbms_server_alertoperator_ge,warning_value=>'1000000',critical_operator=>dbms_server_alertoperator_ge,critical_value=>'2000000',observation_period=>1,consecutive_occurrences=>5,instance_name=>'ORCL11G',object_type=>dbms_server_alertobject_type_system,object_name=>null);