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<p><b>Object access method</b> (<b>OAM</b>) is an <a href="Access_method" title="Access method">access method</a> under <a href="Z/OS" title="Z/OS">z/OS</a> which is designed for the storage of large numbers of large files, such as images. It has a number of distinguishing features, e.g. compared to <a href="Virtual_storage_access_method" class="mw-redirect" title="Virtual storage access method">VSAM</a>:
</p>
<ul><li>OAM datasets do not have an internal record structure; they are accessed as binary data streams.</li>
<li>OAM datasets are not directly cataloged. Rather, they are stored into OAM collections, with only the OAM collection being cataloged. The reason for this is to prevent the catalog from being overloaded with large numbers of (e.g. image) files.<sup id="cite_ref-HardingClark1990_1-0" class="reference"><a href="#cite_note-HardingClark1990-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li></ul>
<p>OAM is used in conjunction with <a href="IBM_Db2" title="IBM Db2">IBM Db2</a>. An example use case for OAM would be storing medical images in a Db2 database running under z/OS.
</p>
<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>
<p>OAM was created in the 1980s "as a prototype product for an insurance company to replace <a href="Microform#Microfiche" title="Microform">microfiche</a>." Initially OAM supported optical storage and magnetic disks. In the 1990s support for <a href="Magnetic_tape_data_storage" class="mw-redirect" title="Magnetic tape data storage">magnetic tape</a> was added. In 2011 support was added for storage of objects in a z/OS unix file system—either <a href="ZFS_(z/OS_file_system)" title="ZFS (z/OS file system)">zFS</a> or <a href="Network_File_System" title="Network File System">NFS</a>.<sup id="cite_ref-Vitse_2-0" class="reference"><a href="#cite_note-Vitse-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p><p>In the 1990s, Object Access Method was used by the <a href="Canadian_Intellectual_Property_Office" title="Canadian Intellectual Property Office">Canadian Intellectual Property Office</a> to store documents related to patent processing.<sup id="cite_ref-Taylor1995_3-0" class="reference"><a href="#cite_note-Taylor1995-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-HardingClark1990-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-HardingClark1990_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite id="CITEREFHardingClarkGalloTang1990" class="citation journal cs1">Harding, W. B.; Clark, C. M.; Gallo, C. L.; Tang, H. (1990). "Object storage hierarchy management". <i>IBM Systems Journal</i>. <b>29</b> (3): <span class="nowrap">384–</span>397. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1147%2Fsj.293.0384">10.1147/sj.293.0384</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0018-8670">0018-8670</a>. <q>The ability to locate existing objects in storage is fundamental to any data processing system. The facility that carries out the locate function for data sets in an MVS system is the catalog. Typical MVS systems may have tens or even hundreds of thousands of data set entries recorded in a hierarchy of catalogs. In contrast, OAM must be able to manage hundreds of millions of objects, which if individually cataloged would require an excessively large catalog... The system catalog was extended through the concept of collections to handle the large numbers of objects expected for image applications. A catalog entry is defined for each collection, and provides the default storage class and management class assignments for objects stored in the collection, and the identifier of the storage group where the collection is physically stored.</q></cite></span>
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<li id="cite_note-Vitse-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-Vitse_2-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFVitse2011" class="citation journal cs1">Vitse, Caroline L. (September 2011). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20140904044949/http://www.ibmsystemsmag.com/mainframe/storage/Data-Management/reintroducing_OAM/">"Reintroducing Object Access Method"</a>. <i>IBM Systems Magazine</i>. Archived from <a rel="nofollow" class="external text" href="http://www.ibmsystemsmag.com/mainframe/storage/Data-Management/reintroducing_OAM/">the original</a> on September 4, 2014<span class="reference-accessdate">. Retrieved <span class="nowrap">Sep 4,</span> 2014</span>.</cite></span>
</li>
<li id="cite_note-Taylor1995-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-Taylor1995_3-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFTaylor1995" class="citation journal cs1">Taylor, Ray H. (1995). "TECHSOURCE: a project to automate the patent operations of the Canadian Intellectual Property Office". <i>World Patent Information</i>. <b>17</b> (3): <span class="nowrap">159–</span>164. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1995WPatI..17..159T">1995WPatI..17..159T</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2F0172-2190%2895%2900017-T">10.1016/0172-2190(95)00017-T</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0172-2190">0172-2190</a>. <q>The IODM uses data from within its DB2 database tables to determine the location of the documents and retrieves them using the Object Access Method (OAM).</q></cite></span>
</li>
</ol></div></div>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://share.confex.com/share/116/webprogram/Handout/Session9008/SHARE_Anaheim11_9008_OAM.pdf">DFSMS Object Support:Data Archiving with OAM</a></li></ul>
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<ul><li><a href="Execute_Channel_Program" title="Execute Channel Program">EXCP</a></li>
<li><a href="Execute_Channel_Program_in_Real_Storage" title="Execute Channel Program in Real Storage">EXCPVR</a></li>
<li><a href="Start_Input/Output" title="Start Input/Output">STARTIO</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Storage</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Execute_Direct_Access_Program" title="Execute Direct Access Program">XDAP</a></li>
<li><a href="Basic_Direct_Access_Method" class="mw-redirect" title="Basic Direct Access Method">BDAM</a></li>
<li><a href="Basic_Sequential_Access_Method" class="mw-redirect" title="Basic Sequential Access Method">BSAM</a></li>
<li><a href="Queued_Sequential_Access_Method" title="Queued Sequential Access Method">QSAM</a></li>
<li><a href="Basic_Partitioned_Access_Method" class="mw-redirect" title="Basic Partitioned Access Method">BPAM</a></li>
<li><a href="Indexed_Sequential_Access_Method" class="mw-redirect" title="Indexed Sequential Access Method">ISAM</a></li>
<li><a href="Virtual_Storage_Access_Method" title="Virtual Storage Access Method">VSAM</a></li>
<li><a href="Object_Access_Method" class="mw-redirect" title="Object Access Method">OAM</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Network</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Basic_Telecommunications_Access_Method" class="mw-redirect" title="Basic Telecommunications Access Method">BTAM</a></li>
<li><a href="Queued_Teleprocessing_Access_Method" class="mw-redirect" title="Queued Teleprocessing Access Method">QTAM</a></li>
<li><a href="Telecommunications_Access_Method" title="Telecommunications Access Method">TCAM</a></li>
<li><a href="Virtual_Telecommunications_Access_Method" title="Virtual Telecommunications Access Method">VTAM</a></li></ul>
</div></td></tr></tbody></table></div>
<p><br>
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