TAILIEUCHUNG - Oracle Built−in Packages- P54

Oracle Built−in Packages- P54: Ah, for the good old days of Version of PL /SQL! Life was so simple then. No stored procedures or functions and certainly no packages. You had your set of built−in functions, like SUBSTR and TO_DATE. You had the IF statement and various kinds of loops. With these tools at hand, you built your batch−processing scripts for execution in SQL*Plus, and you coded your triggers in SQL*Forms , and you went home at night content with a good day's work done. | Appendix A What s on the Companion Disk Read the message and update or delete it. This is the default behavior. When you read from the queue the message is removed from the queue. Note that the message can be retained in the queue table based on its retention properties. navigation Specifies the position of the message that will be retrieved next. When you perform a dequeue the following steps are taken a the position in the queue is determined b the search criterion specified by this and other fields is applied and c the appropriate message is retrieved. These are the valid options for this field Retrieve the next message that is available and matches all the search criteria. If the previous message belongs to a message group AQ will retrieve the next available message that matches the search criteria and belongs to the message group. This is the default behavior. Skip the remainder of the current transaction group if any and retrieve the first message of the next transaction group. This option can be used only if message grouping is enabled for the current queue. Retrieve the first message that is available and matches the search criteria. This will reset the current position to the beginning of the queue. visibility Specifies whether the new message is dequeued as part of the current transaction. This parameter is ignored when you have specified the BROWSE mode to read the queue. The following options are valid The dequeue is treated as part of the current transaction. The dequeue operation completes only when the transaction commits. This is the default case. The dequeue is not treated as part of the current transaction. Instead the dequeue operation acts as its own transaction. The queued message is then immediately available for dequeuing by other Oracle sessions. wait Specifies the number of seconds to wait if there is currently no message .

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