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Say you re reading data from a table (using a SELECT statement). You re-execute your query after some time elapses, and in the meantime, some other user has inserted new data into the table. Because your second query will come up with extra rows that weren t in the first read, they re referred to as phantom reads, and the problem is termed a phantom read. Phantom-read problems are caused by the appearance of new data in between two database operations in a transaction.

A job class groups a set of jobs that share common characteristics, such as resource requirements. Job classes enable you to allocate resources among jobs by grouping similar types of jobs together. You use job classes to do a couple of things: Assign job priority levels for individual jobs, with a higher-priority job always starting before a lower-priority job. Specify common attributes for a set of jobs. You use the Database Resource Manager in coordination with the Scheduler to allocate scarce resources in your database. In the Database Resource Manager, the concept of a resource consumer group lets you group users according to their resource usage. Oracle controls resource allocation by assigning each job class to a specific resource consumer group. By default, a job class is assigned to the default consumer group.

SELECT r.emp_id, select_emp(r.emp_id), r.emp_type, select_emp_desc(r.emp_type), COUNT(*) FROM emp_records r GROUP BY r.emp_id, r.emp_type;

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Scheduler windows offer a link to the Oracle Resource Manager. A window represents an interval of time during which you can schedule jobs, and the purpose of using windows is to change resource

The parsing stage of query processing consumes resources, and ideally you should parse just once and use the same parsed version of the statement for repeated executions. Parsing is a much more expensive operation than executing the statement. You should use bind variables in SQL statements instead of literal values to reduce the amount of parsing in the database. Bind variables should be identical in terms of their name, data type, and length. Failure to use bind variables leads to heavy use of the shared pool area and, more often than not, contention for latches and a general slowing down of the database when a large number of queries are being processed. Sometimes your application may not be changeable into a form where bind variables are used. In 22, you ll see how to use Oracle configuration parameters to force statements that fail to use bind variables to do so.

allocation during specific time periods. Each window is associated with a specific resource plan, which you create through the Database Resource Manager. Using windows, you can activate different resource plans during different time periods, thus providing differential prioritizing for jobs.

One of the challenges with NTP terminology is that the same physical NTP entities wear multiple hats as a function of their interactions with other NTP devices When considering the number of clients at a deployment site, the word client is used to mean any NTP device at the site other than the primary time source(s), which were discussed in the preceding Step 1: Choosing Your NTP Time Source section Those clients are bound to include one or more servers that will be synchronizing their time with the primary time sources, in all likelihood one or more of the Internet public servers or pool In turn, those newly become clients/servers may also peer with one another (be configured at the same stratum level but at a higher one than the primary time source) to facilitate a degree of redundancy, thus giving them a third hat, that of a peer.

Views have several benefits to offer, but faster performance may not necessarily be one of them. Views are useful when you want to present only the relevant portions of a table to an application or a user. Whenever you query a view, it has to be instantiated at that time. Because the view is just a SQL query, it has to perform this instantiation if you want to query the view again. If your query uses joins on views, it could lead to substantial time for executing the query.

A window group is a collection of similar windows. For example, you can create a window for your weekends and a window for your holidays, and group both these windows into a single maintenance window group.

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