Entry Sequenced Data Set

Entry Sequenced Data Set

An Entry Sequenced Data Set (ESDS) is a type of data set used by the VSAM computer data storage system. Records are accessed based on their sequential order, that is, the order in which they were written to the file; which means that accessing a particular record involves searching all the records sequentially until it is located, or by using a relative physical address ("Relative byte address‎", RBA), i.e. the number of bytes from the beginning of the file to start reading. ESDS is therefore very time consuming, and hence there was a need for other type of records access.

ee also

*Key Sequenced Data Set
*Relative Record Data Set
*Random access

References

*http://www.auditmypc.com/acronym/ESDS.asp
*http://www.jaymoseley.com/hercules/vstutor/vstutor.htm
*http://www.mvsforums.com/techfaqsvsam.html


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  • Entry Sequenced Data Set — Saltar a navegación, búsqueda Entry Sequenced Data Set (ESDS) es un tipo de organización de datos usado en VSAM, un sistema de ficheros de IBM. El acceso a cada registro se realiza en orden secuencial, es decir, el orden en el que fueron escritos …   Wikipedia Español

  • Key Sequenced Data Set — A Key Sequenced Data Set (KSDS) is a type of data set used by the IBM VSAM computer data storage system. Each record in a KSDS data file is embedded with a unique key. A KSDS consists of two parts, the data component and a separate index file… …   Wikipedia

  • Key Sequenced Data Set — (KSDS) es un tipo de organización de datos usado en VSAM, un sistema de ficheros de IBM. Cada registro en un KSDS tiene asociado una clave única. Un fichero KSDS consiste de dos componentes: uno de datos y otro de un índice que permite al sistema …   Wikipedia Español

  • Relative Record Data Set — A Relative Record Data Set (RRDS) is a type of data set used by the VSAM computer data storage system. Records are accessed based on their ordinal position in the file ( relative record number , RRN). For example, the desired record to be… …   Wikipedia

  • Relative Record Data Set — Saltar a navegación, búsqueda Relative Record Data Set (RRDS) es un tipo de organización de datos usado en VSAM, un sistema de ficheros de IBM. Se accede a los registros mediante su posición ordinal en el fixhero. Por ejemplo, el registro deseado …   Wikipedia Español

  • Linear Data Set — An Linear Data Set (LDS) is a type of data set used by the VSAM computer data storage system. A Linear Data Set contains data that can be accessed as byte addressable strings in virtual storage. The LDS is composed of VSAM Control Intervals (CI… …   Wikipedia

  • ESDS — Entry Sequenced Data Set (Computing » General) * Elementary School Day Study (Community » Educational) …   Abbreviations dictionary

  • ESDS — Entry Sequenced Data Set (VSAM) …   Acronyms

  • ESDS — Entry Sequenced Data Set (VSAM) …   Acronyms von A bis Z

  • Virtual storage access method — (VSAM) is an IBM disk file storage access method, first used in the OS/VS2 operating system, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS. Originally a record oriented filesystem, VSAM comprises four data… …   Wikipedia

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