TAILIEUCHUNG - Oracle Built−in Packages- P43

Oracle Built−in Packages- P43: 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 Note that each user is informed only of bids placed by the other user and not of their own bids. Note also that USER02 was alerted to the fact that item PS447 the subject of the previous bidding by USER02 had been closed. So the auction system really does work and quite well as a matter of fact PREVIOUS DBMS_PIPE Communicating Between Sessions HOME BOOK INDEX NEXT 4. User Lock and Transaction Management . Orode PL SQL Orode PL SQL orT Programming. I Programming Mw Second Edition Guide to Orade8i Features Packages Oracle Advanced PL SQL Orode Wefc Applications Orode PL SQL Orode PL SQL I Buít-in I Programmng I PL SQL Developer s I Laigvoge I Budt-ins Packages wrtki Packages Introduction Pocket Reference Pocket Reference Copyright c 2000 O Reilly Associates. All rights reserved. DBMS_ALERT Examples 201 Oracle Built-in Packages SEARCH PREVIOUS Chapter 4 NEXT 202 4. User Lock and Transaction Management Contents DBMS_LOCK Creating and Managing Resource Locks DBMS_TRANSACTION Interfacing to SQL Transaction Statements Complex multiuser applications that manage new types of resources objects BLOBs etc. require the ability to manage contention for those resources. The Oracle database manages concurrent multiuser contention for data using sophisticated locking mechanisms. This chapter describes two packages that provide interfaces to the Oracle lock and transaction management facilities DBMS_LOCK Oracle now provides developers with the keys to its locking mechanisms through the DBMS_LOCK package watch out though this deceptively powerful package might also put your applications to sleep DBMS_TRANSACTION Complements DBMS_LOCK by providing a programmatic interface to a number of transaction-oriented SQL statements. DBMS_LOCK Creating and Managing Resource Locks The DBMS_LOCK package makes Oracle lock management services available to PL SQL developers. User locks created and managed using DBMS_LOCK are functionally .

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