WO2010116179A1 - Database schema complexity reduction - Google Patents

Database schema complexity reduction Download PDF

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Publication number
WO2010116179A1
WO2010116179A1 PCT/GB2010/050594 GB2010050594W WO2010116179A1 WO 2010116179 A1 WO2010116179 A1 WO 2010116179A1 GB 2010050594 W GB2010050594 W GB 2010050594W WO 2010116179 A1 WO2010116179 A1 WO 2010116179A1
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WO
WIPO (PCT)
Prior art keywords
data
database
sets
data sets
items
Prior art date
Application number
PCT/GB2010/050594
Other languages
French (fr)
Inventor
Mark Knight
Mark Sullivan
Michael Lamb
Original Assignee
Omnifone Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omnifone Ltd filed Critical Omnifone Ltd
Priority to AU2010233496A priority Critical patent/AU2010233496A1/en
Priority to CA2757918A priority patent/CA2757918A1/en
Priority to EP10717215A priority patent/EP2417541A1/en
Priority to US13/263,398 priority patent/US20120197946A1/en
Priority to SG2011072865A priority patent/SG175095A1/en
Publication of WO2010116179A1 publication Critical patent/WO2010116179A1/en
Priority to ZA2011/07187A priority patent/ZA201107187B/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/27—Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/28—Databases characterised by their database models, e.g. relational or object models
    • G06F16/284—Relational databases
    • G06F16/288—Entity relationship models
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/24—Querying
    • G06F16/245—Query processing
    • G06F16/2455—Query execution
    • G06F16/24552—Database cache management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/40—Information retrieval; Database structures therefor; File system structures therefor of multimedia data, e.g. slideshows comprising image and additional audio data
    • G06F16/48—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/21—Design, administration or maintenance of databases
    • G06F16/211—Schema design and management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
    • G06F16/35—Clustering; Classification
    • G06F16/355—Class or cluster creation or modification
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/60—Information retrieval; Database structures therefor; File system structures therefor of audio data

Definitions

  • the invention relates to the field of database design and data storage, representation or manipulation.
  • a historically recurring issue with large databases is that describing the structural relationships between multiple data items has required a database structure which is correspondingly large, complex and unwieldy. Maintaining such a complex structure has proven problematic, resulting in over-long access times and increased complexity when extracting or updating the data in such databases.
  • the present invention discloses a novel method for producing database schemas which resolve those historical problems.
  • the present invention makes use of generic sets to represent relationships between complex collections of interrelated data.
  • the complexity of a database schema can be greatly reduced by representing the relationships between data items as these data sets (sets of data items). These sets of data items may be defined in one or more database tables in a database.
  • a Track Set Table lists all the different sets, where a set is a collection of tracks with a common characteristic — one set could be classical tracks, another set could be 'most played' tracks, another set could be favorite driving tracks (sets can be automatically generated or defined manually or by the use of a tool). So each row in this Track Set Table lists a particular set, plus accompanying metadata and a unique ID to aid retrieval of that particular set.
  • each row in this table lists the associated unique ID for the set that the track belongs to plus additional metadata such as the minimum information needed to be displayed to a user (e.g. artists name; track name), plus a reference to the full data (e.g. MP3 file) in the Track Database Table.
  • This table structure in effect separates the 'core' data (e.g. the several thousand MP3 tracks) from the relationships between the tracks and allows a much simplified database structure or schema.
  • This approach provides for much simplified database data management and control. It enables the easy pre- or re- calculation of sets and provides for the easy creation of hierarchical meta-data trees, which are ideal for the targeted delivery of data to the user. Definitions
  • music and “media content” in this document are to be taken to encompass all “media content” which is in digital form or which it is possible to convert to digital form - including but not limited to books, magazines, newspapers and other periodicals, video in the form of digital video, motion pictures, television shows (as series, as seasons and as individual episodes), computer games and other interactive media, images (photographic or otherwise) and music.
  • track indicates a specific item of media content, whether that be a song, a television show, an eBook or portion thereof, a computer game or any other discreet item of media content.
  • playlist and "album” are used interchangeably to indicate collections of “tracks” which have been conjoined together such that they may be treated as a single entity for the purposes of analysis or recommendation.
  • digital media catalogue digital music catalogue
  • media catalogue media catalogue
  • catalog catalog
  • DRM Digital Rights Management
  • the verb "to listen” is to be taken as encompassing any interaction between a human and media content, whether that be listening to audio content, watching video or image content, reading books or other textual content, playing a computer game, interacting with interactive media content or some combination of such activities.
  • device and “media player” are used interchangeably to refer to any computational device which is capable of playing digital media content, including but not limited to MP3 players, television sets, home computer systems, mobile computing devices, games consoles, handheld games consoles, vehicular-based media players or any other applicable device or software media player on such a device.
  • the "server” is a computing device which operates as a database server.
  • the "client” device is a computing device and which may be a mobile computing device.
  • the client device may be the same computing device as the server in some configurations.
  • the "remote database” consists of a collection of data items, however represented, on the server.
  • the "local database” consists of a collection of data items, however represented, on the client device.
  • the "network” is a method of communicating between the said server and the said client device using, for example, the internet, a local network or a wireless network.
  • the database and data items referred to are structured in a relational database which is accessed, directly or indirectly, using Structured Query Language (SQL) or some equivalently powerful Application Programming Interface (API).
  • SQL Structured Query Language
  • API Application Programming Interface
  • the local database is provided via an embedded C database engine.
  • the client application utilises an external database, whether external to the client application software or external to the client device entirely.
  • the present invention makes use of generic sets to represent relationships between complex collections of interrelated data.
  • the database may (but does not have to be) a relational database. It enables the easy pre- or re- calculation of sets and provides for the easy creation of hierarchical meta-data trees which are ideal for the targeted delivery of data to the user.
  • sets are defined in the database using a pair of tables, one defining the set itself and another defining the items in that set.
  • the two tables are collapsed into a single database table while other example embodiments represent the sets-"set item" relationship using more than two database tables but nonetheless preserve the essential structure of representing a set-to-"set item” relationship.
  • the "Set” table stores such metadata as is required to retrieve a specific set or group of sets.
  • that metadata includes fields which are used to store the type of a set, such as that an "artist set” is a set of artists which are all related to a particular "genre” of music.
  • the "Set Item” table stores individual items with a set, with each item being linked to its enclosing set using any reasonable method, including the use of traditional "foreign keys" into the "Set” database table.
  • Each row in the "Set Item” table may, in one example embodiment, include a foreign key into another database table which contains the actual data for that item.
  • a set item which describes an Artist may have a foreign key linking into an "Artist” database table which may be used to retrieve the full data for the artist to which that "set item” refers.
  • the "set item” rows may duplicate some or all of the data in that "Artist” table, in order to permit more immediate access to that data (i.e. removing the need to link to the separate Artist table when querying the database).
  • items in the data sets may include de-normalised associated information.
  • the "set item” table and the said “Artist” table are in fact the same database table.
  • a combination of the said techniques is employed, in that the "set item” table rows contain both a foreign key in an "Artist” table and duplicate such data from that "Artist” table in the "Set Item” table as is needed when retrieving items for a given set.
  • the database structure is able to be considerably simplified from the traditional model, which makes use of multiple cross-reference tables to retrieve those collections of data which are actually used in the computer program which is utilised to access the database.
  • de-normalisation is built in to the database design in the preferred embodiment.
  • a name will accompany a foreign key for speed of reference to the name which is often, with the ID, the only thing of interest required initially when a computer program requests a set of data.
  • data sets themselves may be, and in the preferred embodiment are, predefined via pre-processing of data or manually using a software tool or dynamically through software as data changes or events occur. In the preferred embodiment, any combination of some or all of the aforementioned processes may be used.
  • the type of data set may be wholly or partially defined by the database table used to store that data set.
  • data representing music tracks is to be loaded into the database.
  • a pre-processing tool which identifies the genre of each track — either by examining the metadata associated with each track or by analysing the track's audio using a DSP (Digital Sound Processing) algorithm or by manual identification of the track genre or by some combination of one or more of the said techniques.
  • DSP Digital Sound Processing
  • the pre-processing tool assigns each track to one or more "track sets" based (for example) on the genre associated with that track. This is done by creating a row for that genre in the Track Set table, if no such row exists, and then adding a row for that track in the Track Set Item table and linking the said row to the associated Track Set.
  • the creation of sets is performed simultaneously with loading the data into the database.
  • sets may be created based on data already loaded into the database.
  • tracks contain associated metadata of arbitrary size and complexity, some or all of which is loaded into a "Track" database table.
  • a "Track Set” database table is designed to be utilised by a computer program which requires only a small subset of that metadata when retrieving a set of tracks.
  • the set definition tool copies that subset of data such that that metadata is duplicated in the "Track Set Item" database table, for ease of access.
  • sets are defined in one or more database tables, where the storage table chosen to store a particular data set may be considered to be metadata about the type of set.
  • a database table track_set may contain sets of music tracks while a database table artist_set contains sets of artists.
  • sets may be defined where the "set item"s for that set are themselves sets. This provides for the creation of sets-of-sets, which may be hierarchical in nature where required.
  • the methods disclosed by the present invention provide for the easy creation of hierarchical meta-data trees which are ideal for the targeted delivery of data to the user.
  • the preferred embodiment of the present invention allows for the definition and usage of collections of sets which may, where required, be hierarchical in nature.
  • Track Sets are identified in the Track Set table using metadata which permits a given set (which may be, in the preferred embodiment, a set of sets) to be retrieved. For example, a query for a set of music tracks with the genre "Light Classical” would retrieve a set from that "Track Set” table where it is a track set of type "genre” and with the sub-type of "Light Classical” using a fast and computationally efficient table look-up process. The collection of Track Set Items linked to that set is then, in the preferred embodiment, returned to the requesting computer program.
  • the database is fully RI (Referential Integrity) protected through triggers, constraints, functions or procedures:

Abstract

In contrast to the traditional approach of defining relationships between data collections using complex groups of cross-reference database tables, the present invention makes use of generic sets to represent relationships between complex collections of interrelated data. The complexity of a database schema can be greatly reduced by representing the relationships between data items as these data sets (sets of data items). These sets of data items may be defined in one or more database tables in a database. This approach provides for much simplified database data management and control. It enables the easy pre- or re- calculation of sets and provides for the easy creation of hierarchical meta-data trees, which are ideal for the targeted delivery of data to the user.

Description

DATABASE SCHEMA COMPLEXITY REDUCTION
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the field of database design and data storage, representation or manipulation.
2. Description of the Related Art
A historically recurring issue with large databases is that describing the structural relationships between multiple data items has required a database structure which is correspondingly large, complex and unwieldy. Maintaining such a complex structure has proven problematic, resulting in over-long access times and increased complexity when extracting or updating the data in such databases.
In addition, the historical solution — which has relied on the creation of large numbers of cross-referencing database tables — has also meant that extending the database's scope to incorporate further types of metadata has required that additional cross-reference tables be added to the database schema, further increasing its complexity and requiring major alterations to the code used to access that database.
The present invention discloses a novel method for producing database schemas which resolve those historical problems.
BRIEF SUMMARY OF THE INVENTION
In contrast to the traditional approach of defining relationships between data collections using complex groups of cross-reference database tables, the present invention makes use of generic sets to represent relationships between complex collections of interrelated data. The complexity of a database schema can be greatly reduced by representing the relationships between data items as these data sets (sets of data items). These sets of data items may be defined in one or more database tables in a database.
For example, in the context of a database that stores a digital media catalogue (e.g. several tens of thousands of MP3 music tracks), then there could a Track Database Table; each individual track occupies a row in the table, with accompanying metadata in that row. A Track Set Table then lists all the different sets, where a set is a collection of tracks with a common characteristic — one set could be classical tracks, another set could be 'most played' tracks, another set could be favorite driving tracks (sets can be automatically generated or defined manually or by the use of a tool). So each row in this Track Set Table lists a particular set, plus accompanying metadata and a unique ID to aid retrieval of that particular set. Then, we have a third table, the Track Set Item table; each row in this table lists the associated unique ID for the set that the track belongs to plus additional metadata such as the minimum information needed to be displayed to a user (e.g. artists name; track name), plus a reference to the full data (e.g. MP3 file) in the Track Database Table. This table structure in effect separates the 'core' data (e.g. the several thousand MP3 tracks) from the relationships between the tracks and allows a much simplified database structure or schema.
This approach provides for much simplified database data management and control. It enables the easy pre- or re- calculation of sets and provides for the easy creation of hierarchical meta-data trees, which are ideal for the targeted delivery of data to the user. Definitions
For convenience, and to avoid needless repetition, the terms "music" and "media content" in this document are to be taken to encompass all "media content" which is in digital form or which it is possible to convert to digital form - including but not limited to books, magazines, newspapers and other periodicals, video in the form of digital video, motion pictures, television shows (as series, as seasons and as individual episodes), computer games and other interactive media, images (photographic or otherwise) and music.
Similarly, the term "track" indicates a specific item of media content, whether that be a song, a television show, an eBook or portion thereof, a computer game or any other discreet item of media content.
The terms "playlist" and "album" are used interchangeably to indicate collections of "tracks" which have been conjoined together such that they may be treated as a single entity for the purposes of analysis or recommendation.
The terms "digital media catalogue", "digital music catalogue", "media catalogue" and "catalogue" are used interchangeably to indicate a collection of tracks and/or albums to which a user may be allowed access for listening purposes.
The abbreviation "DRM" is used to refer to a "Digital Rights Management" system or mechanism used to grant access rights to a digital media file.
The verb "to listen" is to be taken as encompassing any interaction between a human and media content, whether that be listening to audio content, watching video or image content, reading books or other textual content, playing a computer game, interacting with interactive media content or some combination of such activities.
The terms "user", "consumer", "end user" and "individual" are used interchangeably to refer to the person, or group of people, whose media content "listening" preferences are analysed and for whom recommendations are made. In all cases, the masculine includes the feminine and vice versa.
The terms "device" and "media player" are used interchangeably to refer to any computational device which is capable of playing digital media content, including but not limited to MP3 players, television sets, home computer systems, mobile computing devices, games consoles, handheld games consoles, vehicular-based media players or any other applicable device or software media player on such a device.
The "server" is a computing device which operates as a database server.
The "client" device is a computing device and which may be a mobile computing device. The client device may be the same computing device as the server in some configurations.
The "remote database" consists of a collection of data items, however represented, on the server.
The "local database" consists of a collection of data items, however represented, on the client device.
The "network" is a method of communicating between the said server and the said client device using, for example, the internet, a local network or a wireless network.
In the preferred embodiment, the database and data items referred to are structured in a relational database which is accessed, directly or indirectly, using Structured Query Language (SQL) or some equivalently powerful Application Programming Interface (API). In the preferred embodiment, the local database is provided via an embedded C database engine. In another embodiment, the client application utilises an external database, whether external to the client application software or external to the client device entirely.
DETAILED DESCRIPTION
In contrast to the traditional approach of defining relationships between data collections using complex groups of cross-reference database tables, the present invention makes use of generic sets to represent relationships between complex collections of interrelated data.
This method provides for much simplified database data management and control. The database may (but does not have to be) a relational database. It enables the easy pre- or re- calculation of sets and provides for the easy creation of hierarchical meta-data trees which are ideal for the targeted delivery of data to the user.
1. Defining Sets
In the preferred embodiment, sets are defined in the database using a pair of tables, one defining the set itself and another defining the items in that set. In another example embodiment the two tables are collapsed into a single database table while other example embodiments represent the sets-"set item" relationship using more than two database tables but nonetheless preserve the essential structure of representing a set-to-"set item" relationship.
The "Set" table stores such metadata as is required to retrieve a specific set or group of sets. In the preferred embodiment, that metadata includes fields which are used to store the type of a set, such as that an "artist set" is a set of artists which are all related to a particular "genre" of music.
The "Set Item" table stores individual items with a set, with each item being linked to its enclosing set using any reasonable method, including the use of traditional "foreign keys" into the "Set" database table.
Each row in the "Set Item" table may, in one example embodiment, include a foreign key into another database table which contains the actual data for that item. For example, a set item which describes an Artist may have a foreign key linking into an "Artist" database table which may be used to retrieve the full data for the artist to which that "set item" refers. In another example embodiment, the "set item" rows may duplicate some or all of the data in that "Artist" table, in order to permit more immediate access to that data (i.e. removing the need to link to the separate Artist table when querying the database). More generally, items in the data sets may include de-normalised associated information.
In yet another example embodiment, the "set item" table and the said "Artist" table are in fact the same database table. In the preferred embodiment, a combination of the said techniques is employed, in that the "set item" table rows contain both a foreign key in an "Artist" table and duplicate such data from that "Artist" table in the "Set Item" table as is needed when retrieving items for a given set.
By separating the core data from the relationships between data items using the method disclosed herein, the database structure is able to be considerably simplified from the traditional model, which makes use of multiple cross-reference tables to retrieve those collections of data which are actually used in the computer program which is utilised to access the database.
For performance and simplicity of use, de-normalisation is built in to the database design in the preferred embodiment. Hence often a name will accompany a foreign key for speed of reference to the name which is often, with the ID, the only thing of interest required initially when a computer program requests a set of data.
2. Creating sets
In addition, the data sets themselves may be, and in the preferred embodiment are, predefined via pre-processing of data or manually using a software tool or dynamically through software as data changes or events occur. In the preferred embodiment, any combination of some or all of the aforementioned processes may be used. The type of data set may be wholly or partially defined by the database table used to store that data set.
In one example embodiment, data representing music tracks is to be loaded into the database. Prior to loading the said data, it is passed through a pre-processing tool which identifies the genre of each track — either by examining the metadata associated with each track or by analysing the track's audio using a DSP (Digital Sound Processing) algorithm or by manual identification of the track genre or by some combination of one or more of the said techniques.
The pre-processing tool, in the example embodiment presented, assigns each track to one or more "track sets" based (for example) on the genre associated with that track. This is done by creating a row for that genre in the Track Set table, if no such row exists, and then adding a row for that track in the Track Set Item table and linking the said row to the associated Track Set.
In another example embodiment, the creation of sets is performed simultaneously with loading the data into the database. In still another embodiment, sets may be created based on data already loaded into the database.
In the said example embodiment, tracks contain associated metadata of arbitrary size and complexity, some or all of which is loaded into a "Track" database table. In this example embodiment, a "Track Set" database table is designed to be utilised by a computer program which requires only a small subset of that metadata when retrieving a set of tracks. In the preferred embodiment, the set definition tool copies that subset of data such that that metadata is duplicated in the "Track Set Item" database table, for ease of access.
In the preferred embodiment, sets are defined in one or more database tables, where the storage table chosen to store a particular data set may be considered to be metadata about the type of set. For example, a database table track_set may contain sets of music tracks while a database table artist_set contains sets of artists.
In the preferred embodiment, sets may be defined where the "set item"s for that set are themselves sets. This provides for the creation of sets-of-sets, which may be hierarchical in nature where required.
3. Hietatchical meta-data trees
The methods disclosed by the present invention provide for the easy creation of hierarchical meta-data trees which are ideal for the targeted delivery of data to the user.
By creating sets of sets, whereby the "set items" which constitute the elements of a set are themselves sets, the preferred embodiment of the present invention allows for the definition and usage of collections of sets which may, where required, be hierarchical in nature.
4. Retrieving Sets
Sets are identified in the Track Set table using metadata which permits a given set (which may be, in the preferred embodiment, a set of sets) to be retrieved. For example, a query for a set of music tracks with the genre "Light Classical" would retrieve a set from that "Track Set" table where it is a track set of type "genre" and with the sub-type of "Light Classical" using a fast and computationally efficient table look-up process. The collection of Track Set Items linked to that set is then, in the preferred embodiment, returned to the requesting computer program.
In the preferred embodiment, specific sets can be referenced from anywhere in the system. Hence new types of lists may be added easily without having to build new cross- reference tables etc. Rather, the system need only reference the foreign key (the "Set ID") of the set type of choice. The application may then retrieve any specific set using that "Set ID" as a foreign key into the table of sets.
5. Referential Integrity
In the preferred embodiment, the database is fully RI (Referential Integrity) protected through triggers, constraints, functions or procedures:
• Cardinality and existence rules on Foreign Key relationships (cascade, restrict on update/delete operations)
• Triggers for pre/post insert/update/delete as required.
• Default values, NULL settings and Constraint checks on fields
The RI protection in the preferred embodiment serves one or more of the following functions:
• Modified and Inserted fields are completely handled in the database and should not be set or modified by the application.
• ID fields are completely handled in the database and should not be set or modified by the application. Hence, in the preferred embodiment, if you insert, then you need to read the inserted record (object) afterwards to have a complete copy of the inserted row (object) containing the newly allocated ID.
• Count fields throughout the database
• Perform field and record-field validation of the possible allowed combination of fields. Such validation conditions are, in the preferred embodiment, checked in the database using triggers in order to completely protect its integrity. In the preferred embodiment, the referential integrity checks are used to, at a rninirnum, ensure that (1) the insertion of a "Set Item" is permitted only if the associated Set exists and that (2) the deletion of a set is permitted either only if that set has no associated "set items" rows. In another example embodiment, the deletion of a Set triggers the automatic deletion of that Set's associated "Set Item" rows.

Claims

1. A method for reducing the complexity of a database schema by representing the relationships between data items as "data sets" (sets of data items).
2. The method in 1 where the sets of data items are defined in one or more database tables in a database
3. The method of Claim 2, in which die database table(s) represent a set-to-"set item" relationship.
4. The method of any preceding Claim 2 or 3 in which a table stores such metadata as is required to retrieve a specific set or group of sets.
5. The method of any preceding Claim where the data sets are defined manually.
6. The method of any preceding Claim 1 — 4 where die data sets are defined using a pre-processing tool or script
7. The method of any preceding Claim 1 — 4 where the data sets are defined dynamically by software as data changes or user actions occur
8. The method of any preceding Claim where the items in the data sets include some de-normalised associated information
9. The method of any preceding Claim where the database's referential integrity is protected using zero, one or more triggers, constraints, functions and procedures.
10. The method of any preceding Claim where one or more data sets can be retrieved using metadata associated with data sets, including but not limited to the type of set.
11. The method in 10 where the type of data set is wholly or partially defined by the database table used to store that data set.
12. The method of any preceding Claim where a unique set identifier is defined for each data set and may be used to retrieve that specific data set.
13. The method of any preceding Claim where the said "data items" are themselves data sets.
14. The method in 13 where the said data sets are defined so as to form a hierarchy of data sets.
15. The method of any preceding Claim where the database is a database of digital media content.
PCT/GB2010/050594 2009-04-07 2010-04-07 Database schema complexity reduction WO2010116179A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU2010233496A AU2010233496A1 (en) 2009-04-07 2010-04-07 Database schema complexity reduction
CA2757918A CA2757918A1 (en) 2009-04-07 2010-04-07 Database schema complexity reduction
EP10717215A EP2417541A1 (en) 2009-04-07 2010-04-07 Database schema complexity reduction
US13/263,398 US20120197946A1 (en) 2009-04-07 2010-04-07 Database schema complexity reduction
SG2011072865A SG175095A1 (en) 2009-04-07 2010-04-07 Database schema complexity reduction
ZA2011/07187A ZA201107187B (en) 2009-04-07 2011-09-30 Daatabase schema complexity reduction

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0906004.7 2009-04-07
GBGB0906004.7A GB0906004D0 (en) 2009-04-07 2009-04-07 MusicStation desktop
GB0911663.3 2009-07-06
GBGB0911663.3A GB0911663D0 (en) 2009-04-07 2009-07-06 Database schema complexity reduction techniques

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