PL/SQL (DBMS_AQ Package): Dequeue of Object Type Messages /*Dequeue from msg_queue:*/DECLAREdequeue_options dbms_aq.dequeue_options_t;message_properties dbms_aq.message_properties_t;message_handle RAW(16);message aq.message_typ;BEGINDBMS_AQ.DEQUEUE(queue_name => 'msg_queue',dequeue_options...
Qlist(3):= aq$_agent('agent3', 'scott.MCQ3', NULL);/* Listen with a time-out of zero: */DBMS_AQ.LISTEN(agent_list => My_agent_list,wait => 0,agent => agent_w_msg);DBMS_OUTPUT.PUT_LINE('Message in Queue :- ' || agent_w_msg.address);DBMS_OUTPUT.PUT_LINE('');END;...
In this paper, we present XMarq, a simple benchmark framework that can be used to compare various software/hardware combinations. Our benchmark model is currently composed of 25 queries that measure the performance of basic operations such as scans, aggregations, joins and index access. This ...
The encryption aimed at DBMS security refers to the encryption and decryption of data in the process of reading and writing data by means of custom functions or built-in system functions, involving database encryption, data access control , security auditing, and data backup.To summarize, all th...
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When a DBMS sees a query, it always sees the entire query and, therefore, executes it immediately. LINQ sees queries in pieces, processing one operator at a time. If LINQ were to take the same approach as a DBMS and fully execute each piece as it is processed, the resulting performance...
Oracle has the most complex, dedicated built-in backup tool of all four servers described here; it’s called Recovery Manager (RMAN). RMAN allows you to run sophisticated backup policies and selective restores. The same operations usually require a lot of manual steps in other RDBMS. ...
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In these versions this does not represent an obvious security risk, but it allows users to schedule untuned and intensive operations that can reduce database performance. For this reason I suggest removing public access to the DBMS_JOB package, and the DBMS_REFRESH package, which can also ...
While these are just four simple commands, they do the bulk of operations within a database. In fact, someone can start using a database very quickly if they understand the basics of these four commands. But while they do seem simple, they can become far more complex. SQL is a programmi...