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With the definition of data taken care of, it is now time to move on to the fun stuff : designing and defining databases. The next group of chapters takes you through the concepts of the database, the objects it comprises, and the SQL language subset known as data definition language, or DDL, that you use to define the objects and the rules governing their behavior. We begin, in 14, with some guidelines for designing relational databases. The chapter ends with a section about schema scripting.

A DATABASE , OF COURSE , STORES DATA . However, data alone has no use unless it is stored according to some rules that first capture its meaning and value, and secondly allow it to be retrieved consistently. A database having an existence within the context of a database management system (DBMS), such as Firebird, comprises a lot of things besides data. Firebird is a relational database management system. As such, it is designed to support the creation and maintenance of abstract data structures, not just to store data but also to maintain relationships and to optimize the speed and consistency with which requested data can be returned to SQL client applications.

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Firebird ships with two pre-built libraries of external functions (UDFs). The default installations place these shared object libraries in the ./UDF directory beneath the Firebird root directory. File extensions are .dll on Windows and .so on other supported platforms. ib_udf: Firebird inherited this library of useful, basic functions with its InterBase ancestry. This library needs to call some memory utilities that are located in a companion shared object name ib_util, located in the ./bin directory. This library passes parameters either by value or by reference, in the conventional InterBase style. Several routines have been bug-fixed in Firebird, so do make certain you avoid versions that ship with Borland products. fbudf: Created by Claudio Valderrama, this library passes parameters by Firebird descriptor, which is considered a more robust way to ensure that internal errors do not occur as a result of memory allocation and type conversion errors. Also freely available are several public domain UDF libraries,4 including FreeUDFLib, originally written in Borland Delphi by Gregory Deatz. FreeUDFLib contains a vast number of string, math, BLOB, and date functions. This library has been maintained, corrected, and augmented by several people over the years. Care should be taken to obtain a version of this library that works properly with dialect 3 date and time types. Such a version for Windows is available from http://www.cvalde.net. C source code for a POSIX version is available as FreeUDFLibC but, at the time of this writing, no trusted binary was available for download.

BUILDSEQNO Controls the order in which objects are built by the Application Designer. For instance, a view must be built before another view that references it, so the referencing view will have a higher build sequence number than the referenced view. Set to Y if a trigger is to be built to maintain the system ID field (new in PeopleTools 8.4). Short code indicating the functional area that owns the record. There are over 250 codes, and the translations are on PSXLATITEM. For example: PPT: PeopleTools HCR: HR Core Objects HG: Global Payroll Core Application Timestamp of the last update in Application Designer. Operator (developer) who last updated this record. Field on record to be updated by database trigger with sequence number obtained from record PSSYSTEMID (new in PeopleTools 8.4). Field on record to be updated by database trigger with a timestamp (new in PeopleTools 8.4). Auxiliary flag mask (new in PeopleTools 8.4). Long description of record.

External code modules are inherently vulnerable to malicious intruders and careless administrators. They are, after all, just files in the filesystem. In Firebird 1.0.x, you can and should configure the location(s) of external function libraries for the server explicitly, using the external_function_directory parameter in the configuration file (isc_config on POSIX servers and ibconfig on Windows). It behooves the DBA to ensure that libraries cannot be overwritten by accident or by unauthorized visitors. From Firebird 1.5 onward, access to external files of any sort can be restricted to various levels of access. By default, if you decide to place external function libraries in non-default locations, they will be inaccessible to the server. Study the notes in 36 about configuring the UDFAccess parameter in firebird.conf to resolve such problems.

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