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Dropping a User Profile
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Dropping a profile is straightforward. Here s how you would drop the test profile: SQL> DROP PROFILE test CASCADE; Profile dropped. SQL> The test profile is assigned to several users in the database, and to drop the profile for all of them, you must use the CASCADE keyword. Note that the users who were assigned the test profile will now be automatically assigned the default profile.
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What Happens When Profile Limits Are Reached
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When a user hits either a session-level or a call-level resource limit, Oracle rolls back the user s statement that is in progress and returns an error message. If it s a call-level limit (such as CPU_PER_CALL), the user s session remains intact, and other statements belonging to the current transaction remain valid. If a session-level limit is reached, the user can t go any further in that session.
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How Do You Know What the Profile Limits Should Be
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You have several ways to gather the statistics to determine the optimal values for several critical resource limits, such as LOGICAL_READS_PER_SESSION. If you re too liberal with the value, some users may hog resources, and if you re too conservative, you ll be fielding many calls from irate users who are prevented from completing their jobs. By using the IDLE_TIME profile attribute, you can limit the amount of time a user s session can remain idle. However, using the DBMS_RESOURCE_MANAGER package may be a better way to control a user s idle connection time, and I explain this package in the Using the Database Resource Manager section of this chapter. Using this package, you can set a maximum idle limit for a session as well as limit the length of time an idle session can block other sessions. Try to get some information from test runs that you ve made of certain jobs. If you don t have reliable historical data, use the AUDIT SESSION statement to acquire baseline data for several parameters, such as connect time and logical reads. You can also use Oracle Enterprise Manager (OEM) to gather the data. In addition, you may have feedback (or complaints!) from the users themselves about programs that are failing due to limits on resource use or that need longer connect times to the database server.
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CHAPTER 12 US ER MA NAG EMENT A ND DA TABA SE S ECUR ITY
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Managing Resources
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With large numbers of database users, resource management becomes an important issue. Server resources are ultimately limited, and you must have some means of apportioning the scarce resources among the users. Oracle provides a powerful tool, the Database Resource Manager, which allows you to control database resource usage in a sophisticated manner. You can use either the user profiles I discussed in the previous section or the Database Resource Manager to control resource usage in your database. User profiles are effective in controlling the resource usage of individual users, but Oracle prefers that you use profiles mainly for password management. Oracle recommends using the Database Resource Manager to control resource usage.
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The Database Resource Manager
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Suppose you re managing a production database with the following problems: Batch jobs are taking up most of the available resources, which is hurting other, more critical jobs that need to run at the same time. Excessive loads at peak times are causing critical processes to run for an unacceptably long time. You schedule large jobs and really can t predict when they might be launched. Some users are using an excessive amount of CPU time, causing you to kill their sessions abruptly. Some users are using a very high degree of parallelism in their operations, which is hurting the performance of the system as a whole. You can t manage active sessions. You want to prioritize jobs according to some scheme, but you can t do so using operating system resources. As you can see, all these problems stem from the inability of the DBA to allocate the limited resources efficiently among competing operations, which leads to lopsided resource allocation and very long response times for critical jobs. The Oracle Resource Manager is the answer it allows you to create resource plans, which specify how much of your resources should go to the various consumer groups. You can group users based on their resource requirements, and you can have the Database Resource Manager allocate a preset amount of resources to these groups. You can distribute the available CPU resources by allocating a set percentage of CPU time to various users. Thus, you can easily prioritize your users and jobs. Your higher-priority online users will be served faster, while your lower-priority batch jobs may take longer. Using the Database Resource Manager, it s possible for you to ensure that your critical user groups (formally referred to as resource consumer groups) are always guaranteed enough resources to perform their tasks. The Database Resource Manager also enables you to limit the length of time a user session can stay idle and to automatically terminate long-running SQL statements and user sessions. Using the Database Resource Manager, you can set initial login priorities for various consumer groups. By using the concept of the active session pool, you can also specify the maximum number of concurrently active sessions for a consumer group the Database Resource Manager will automatically queue all subsequent requests until the currently running sessions complete. The DBA can also automatically switch users from one resource group to another, based on preset resource usage criteria, and can limit the amount of undo space a resource group can use.
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