Oracle Functions PL/SQL guide Reference


Oracle Functions PLSQL: through the realization of this space dedicated to the DB Oracle, a series of instruments is offers, than they will on hand allow you to have true and just tutorial a Function plsql. Oracle Database is most powerful and reliable sql programming for erp solutions.

Oracle plsql : all the power of plsql programming.

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The main advantages that derive from it I use of sql stored procedures are following:

Stored procedure avoids to rewrite query complex offering the possibility to recall from the outline oracle one. Consequently also the number of information that will be exchanged between client and serveur will be smaller to all advantage of the net cargo. The compilation of stored procedures happens once single, to its insertion. Every time that the procedure comes recalled comes simply executed and this meaningfully increases the performances of the Database Oracle Serveur. I use of stored procedures allows to maintain bookcases of functions to use inside of the database same. Potentially every operation could be executed recalling one various procedure, without to know the structure of a database even complex, or having of one limited acquaintance. Just for this reason, the administrator of the database oracle can sometimes avoid to grant the modification permissions or of reading on many tables to he determines customers to you, granting simply the permission to execute stored the procedures.

The main disadvantages are instead following:

Stored procedures increase the workload for the serveur. Sometimes the language cannot be used that would be wanted to be used, because the DBMS does not support it. Logic of the program comes moved on the serveur; this is not necessarily a disadvantage, but he is not compatible with the logical model of junior clerks you to three levels.

SQL Data Types	SELECT Statement
Oracle Server	DISTINCT
Declaring Variables	Primary Keys
Is Null / Is Not Null	Unique Constraints
Views	WHERE Clause
Sequences	"LIKE" Condition
UNION Query	"IN" Function
UNION ALL Query	BETWEEN Condition
INTERSECT Query	EXISTS Condition
MINUS Query	GROUP BY
Synonyms (create, drop)	HAVING
Grant Revoke Privileges	ORDER BY (sort by)
Roles (set of privileges)	UPDATE Statement
Change Password	INSERT Statement
Indexes	DELETE Statement
Creating Functions	Subqueries
Creating Procedures	JOINS (inner, outer)
Exception Handling	Query
Oracle 10g	Oracle 9i
Administration	SubStr
About Oracle errors messages	oracle

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29-11-2006

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	One of the primary benefits of the language pl sql of oracle is its flexibility because you can catch up the same result using different methods. Occore therefore to estimate the performances that dramatically vary second lai base of data and the structure of the chosen indices from the ottimizzatore of Oracle.


Oracle SQL analyzes supplies it the tools in order to collect the information on the objects of the atmosphere and the outline of base of data, in order to analyze the SQL performances, in order to identify and to confront the methods different of the ottimizzatore and in order to publish the declaration of SQL for the optimal performances in some cases, automatically.


With tuning the SQL, you can analyze the base given and statistics of the performances in order to identify the problematic fields oracle plsql. The following sections describe the information that you can re-unite and the methods Oracle SQL analyze the Marches available for tuning the SQL.

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While the SQL declaration efficient can contribute to improve the performances peak of the base of data, the declaration inefficient can cause to the performances disc of a valve. In many cases, to make a tuning of your declaration of SQL can increase the performances generates them of 100%. Tuning the SQL has not been an operation simple to make in the past because deepened acquaintance demanded one and a lot the experience.: knowledge of the atmosphere and the running data acquaintance of all the objects of the outline one understanding of the ottimizzatore of Oracle one deepened acquaintance of SQL.


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