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Oracle Database 11g offers the new built-in Scheduler feature that helps you automate jobs from within the Oracle database. The DBMS_SCHEDULER package contains various functions and procedures that help manage the Scheduler, although you can also schedule jobs very easily through the Database Control interface as well. The most important architectural feature of the Scheduler is its modular approach to managing tasks, which enables the reuse of similar jobs. You can also use the Scheduler along with the Database Resource Manager to fine-tune the allocation of resources among various jobs. The Scheduler is not only a job-specification tool; it also helps you control resource usage and prioritize jobs within the database. One of the limitations of the DBMS_JOB package is that it can only schedule PL/SQL-based jobs, and you can t use it to schedule operating system scripts or an executable. To run these non-databasetype jobs, you must use the crontab in UNIX or the AT facility in Windows servers, or a third-party tool. The Oracle Scheduler lets you use PL/SQL scripts, operating system shell scripts, Java programs, and native binary executables to perform scheduled jobs.

The Scheduler consists of five basic components jobs, schedules, programs, events, and chains. Jobs are pretty similar to the jobs used in the DBMS_JOB package, but schedules, programs, events, and chains are new concepts, leading to a modular approach to the management of tasks. A program, for example, enables several users to perform similar tasks. Let s examine the basic Scheduler components in more detail.

A job is a task that you schedule to run one or more times A job contains a specification of what is to be executed, and when it should be executed. A Scheduler job can execute a PL/SQL block of code, a native binary executable, a Java application, or a shell script. You can create a new job by specifying the job details such as the actions that the job performs and time and frequency of the execution,

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Whether you use standard update batching or Oracle update batching, you will gain performance Tip

just as you can with the traditional DBMS_JOB package. In the Scheduler, you can abstract all the job execution and timing details by using the program and schedule modules.

The Impact of Public NTP Servers Use on Your Network s Security The impact of a public NTP server s use on your network s security complements the initial public server security consideration, which relates to the server s physical and administrative environment over which you have no control to begin with! If an NTP client on your network (assume a scenario with a stratum 2 server on your network acting as a client to a stratum 1 public server on the Internet) is behind a firewall, then the firewall will need to be configured to allow UDP traffic on port 123 to pass through it. Also, chances are that the NTP traffic between your NTP client/server and the public server will be transmitted in the clear (unencrypted), making the NTP packets subject to tampering by intruders. Thus, the combination of allowing traffic on port 123 through a firewall, having NTP packets transmitted in the clear, and encountering the uncertainty over the administrative/ security environment of the public servers themselves should give security-conscious network administrators pause to think about the collective implications of these factors on the security of their networks. Access control configuration based on the IP addresses of

A schedule is a specification of when and how frequently the database executes a job. You can use the same schedule for several jobs. You can also have schedules that specify job execution when a specific event occurs in the database.

A program contains metadata about a Scheduler job. A program includes the program name, the program type (PL/SQL code or a UNIX shell script, for example), and the program action, which is the actual name of a procedure or executable script, for example. Several jobs can use the same program. Note that a job can specify what the job is executing directly in the job definition, or it can use a preexisting program for that purpose.

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