By Don Chamberlin

DB2 common Database (UDB) helps many differing kinds of functions, on many alternative types of facts, in lots of various software program and environments.

This ebook presents a whole consultant to DB2 UDB model five in all its elements, together with the interfaces that aid finish clients, software builders, and database directors. it truly is complementary to the IBM product documentation, supplying a transparent and casual rationalization of ways the positive factors of DB2 have been meant for use. it's an intensive revision of the author's prior booklet, utilizing the recent DB2: IBM's Object-Relational Database procedure . * deals entire and self-contained info, and doesn't suppose earlier wisdom of DB2, SQL, or relational database innovations * Covers uncomplicated ideas of database administration in addition to the complicated positive aspects of UDB, together with recursive queries, constraints, triggers, user-defined datatypes, saved techniques, parallel databases, and graphical instruments for database management * comprises dozens of sensible advice that would keep readers many hours of labor in constructing database purposes * presents thousands of verified examples written in SQL, C, C++, and Java, all of that are to be had at the MKP website

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Transport Streams use fixed length 188-byte packets, with additional error protection and incorporate timestamps within the packets to ensure correct synchronisation. They are intended for use in error-prone environments. However, because of their additional complexity, Transport Streams are more difficult to create and de-multiplex than Program streams, and therefore the initial caching architecture focuses upon the handling of Program Streams only. Program Streams are constructed from one or more Packetised Elementary Stream (PES) packets.

Each mechanism is tailored for a different operating environment. The first scheme, known as a Program Streaming, uses large packets of variable sizes and is designed for use in a largely error-free environment. The scheme is similar to the MPEG-1 multiplexing standard and can support only one program (a number of elementary video/audio streams with a common time base). The second scheme, known as a Transport Streaming, can combine multiple programs with independent time bases into a single stream.

Each cache block corresponds to one second of presentation time for a given program stream. This interval represents the minimal required granularity of media access (seeking to a finer granularity serves no useful purpose in Video-on-Demand scenarios). By caching data in blocks of one second severe fragmentation is avoided and the scope required by the indexing scheme is reduced. Cache blocks are uniquely identified for storage and retrieval through a combination of bitstream_ID and presentation time (each 32 bits wide).

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