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These guidelines will become clearer as I explain how to implement a foreign key. First, let s take a look at the basic syntax used to create that constraint. If you want to add a FOREIGN KEY constraint as a column constraint, you must add the constraint to a column definition, as shown in the following syntax: <column name> { <data type> | <domain> } [ NOT NULL ] REFERENCES <referenced table> [ ( <referenced columns> ) ] [ MATCH { FULL | PARTIAL | SIMPLE } ] [ <referential triggered action> ] If you want to add a FOREIGN KEY constraint as a table constraint, you must add it as a table element in the table definition, as shown in the following syntax: [ CONSTRAINT <constraint name> ] FOREIGN KEY ( <referencing column > [ {, <referencing column> } . . . ] ) REFERENCES <referenced table> [ ( <referenced columns> ) ] [ MATCH { FULL | PARTIAL | SIMPLE } ] [ <referential triggered action> ] As you can see, a FOREIGN KEY constraint is a bit more complicated than the constraint syntax you ve looked at so far. However, creating a basic FOREIGN KEY constraint is a relatively straightforward process. Let s take a look at one first, and then we ll go on to the more complex language elements. In the following example, I use a CREATE TABLE statement to create the CD_TITLES table (shown in Figure 4-5) and define a column constraint:

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Stored procedures were first introduced by Sybase in the original Sybase SQL Server product (Functions and triggers evolved a bit later, and thus are discussed later in this chapter) Much of the original enthusiasm for stored procedures was because of their performance advantages in a client/server database architecture Without stored procedures, every SQL operation requested by an application program (running on the client computer system) would be sent across the network to the database server and would wait for a reply message to be returned across the network If a logical transaction required six SQL operations, six network round trips were required With stored procedures, the sequence of six SQL operations could be programmed into a procedure and stored in the database The application program would simply request the execution of the stored procedure and await the results.

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CREATE TABLE CD_TITLES ( CD_TITLE_ID INT, CD_TITLE VARCHAR(60), PUBLISHER_ID INT REFERENCES CD_PUBLISHERS );

In this way, six network round trips could be cut to one round trip the request and reply for executing the stored procedure Stored procedures proved to be a natural fit for the client/server model, and Sybase used them to establish an early lead with this architecture A competitive response quickly followed from many of the other DBMS vendors Today, most enterprise DBMS products provide a stored procedure capability, and the benefits of stored procedures in corporate databases has expanded considerably beyond the early focus on network performance Stored procedures are less relevant for other types of specialized DBMS systems, such as data warehousing systems or in-memory databases Some DBMS products have modeled their SPL structures on C or Pascal language constructs Others have tried to match the style of the SQL Data Manipulation Language (DML) and Data Definition Language (DDL) statements.

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A long recovery time is estimated. When recovery time is predicted to be longer than the recovery interval configuration option, a checkpoint is triggered. SQL Server 2000 uses a simple metric to predict recovery time, because it can recover, or redo, in less time than it took the original operations to run. Thus, if checkpoints are taken at least as often as the recovery interval frequency, recovery will complete within the interval. A recovery interval setting of 1 means checkpoints occur every minute. A minimum amount of work must be done for the automatic checkpoint to fire; this is currently 10MB of log per minute. In this way, SQL Server does not waste time taking checkpoints on idle databases. A default recovery interval of 0 means that SQL Server will choose an appropriate value automatically; for the current version, this is one minute.

Oracle, on the other hand, based its SPL (PL/SQL) on the Ada programming language, because it was the standard language of its large US government customers While stored procedure concepts are very similar from one SQL dialect to another, the specific syntax varies considerably..

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