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- Basic_sequential_access_method abstract "In IBM mainframe operating systems, Basic sequential access method (BSAM) is an access method to read and write datasets sequentially. BSAM is available on OS/360, OS/VS2, MVS, z/OS, and related high-end operating systems.BSAM is used both for devices that are naturally sequential, such as punched card readers, punches and line printers, and for data on devices that could also be addressed directly, such as magnetic disks. BSAM offers device independence: to the extent possible, the same API calls are used for different devices.BSAM is—as its name says—basic, in this specific context meaning unbuffered with no deblocking of reads and no blocking of writes, although buffering is an option, but neither deblocking nor blocking. It allows programs to read and write physical blocks of data, as opposed to the more advanced Queued Sequential Access Method (QSAM) which allows programs to access logical records within physical blocks of data.Indeed, the BSAM user must be aware of truncated final blocks (a block at the end of a dataset which is shorter than the BLKSIZE of the dataset) and, in many cases, embedded truncated blocks (blocks within a dataset which are shorter than the BLKSIZE of the dataset). QSAM has none of these significant limitations. So-called \"standard blocks\" (blocks being equal to the BLKSIZE) may, in some cases, be forced, but the user must still be prepared for at least the final block being truncated.If the dataset is unblocked, that is, LRECL is equal to BLKSIZE, BSAM may be utilized to simulate a directly accessed dataset using NOTE (to notify the application of a record's position within the dataset) and POINT (to position the dataset for accessing the record specified by the application, using a value previously supplied by NOTE), on any supported direct access device type (DEVD=DA), and some primitive applications were designed in this way.The BSAM application program interface can be compared with the interface offered by open, read, write and close calls (using file handles) in other operating systems such as Unix and Windows.".
- Basic_sequential_access_method wikiPageID "13720123".
- Basic_sequential_access_method wikiPageLength "2938".
- Basic_sequential_access_method wikiPageOutDegree "20".
- Basic_sequential_access_method wikiPageRevisionID "696915611".
- Basic_sequential_access_method wikiPageWikiLink Access_method.
- Basic_sequential_access_method wikiPageWikiLink Application_programming_interface.
- Basic_sequential_access_method wikiPageWikiLink Category:IBM_mainframe_operating_systems.
- Basic_sequential_access_method wikiPageWikiLink Data_set_(IBM_mainframe).
- Basic_sequential_access_method wikiPageWikiLink IBM_Information_Management_System.
- Basic_sequential_access_method wikiPageWikiLink IBM_mainframe.
- Basic_sequential_access_method wikiPageWikiLink ISAM.
- Basic_sequential_access_method wikiPageWikiLink MVS.
- Basic_sequential_access_method wikiPageWikiLink Microsoft_Windows.
- Basic_sequential_access_method wikiPageWikiLink 360_and_successors.
- Basic_sequential_access_method wikiPageWikiLink VS2.
- Basic_sequential_access_method wikiPageWikiLink Operating_system.
- Basic_sequential_access_method wikiPageWikiLink Punched_card.
- Basic_sequential_access_method wikiPageWikiLink Queued_Sequential_Access_Method.
- Basic_sequential_access_method wikiPageWikiLink Sequential_access_memory.
- Basic_sequential_access_method wikiPageWikiLink Unix.
- Basic_sequential_access_method wikiPageWikiLink OS.
- Basic_sequential_access_method wikiPageWikiLinkText "BSAM".
- Basic_sequential_access_method wikiPageWikiLinkText "Basic sequential access method".
- Basic_sequential_access_method wikiPageWikiLinkText "basic sequential access method".
- Basic_sequential_access_method wikiPageUsesTemplate O_access_methods.
- Basic_sequential_access_method subject Category:IBM_mainframe_operating_systems.
- Basic_sequential_access_method hypernym Method.
- Basic_sequential_access_method type Software.
- Basic_sequential_access_method type Redirect.
- Basic_sequential_access_method comment "In IBM mainframe operating systems, Basic sequential access method (BSAM) is an access method to read and write datasets sequentially. BSAM is available on OS/360, OS/VS2, MVS, z/OS, and related high-end operating systems.BSAM is used both for devices that are naturally sequential, such as punched card readers, punches and line printers, and for data on devices that could also be addressed directly, such as magnetic disks.".
- Basic_sequential_access_method label "Basic sequential access method".
- Basic_sequential_access_method sameAs Q4867048.
- Basic_sequential_access_method sameAs m.03cg4qf.
- Basic_sequential_access_method sameAs Q4867048.
- Basic_sequential_access_method wasDerivedFrom Basic_sequential_access_method?oldid=696915611.
- Basic_sequential_access_method isPrimaryTopicOf Basic_sequential_access_method.