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| − | == ^XTMP Global ==
| + | #REDIRECT[[GLOBAL ^XTMP]] |
| − | | + | [[Category:GLOBAL]] |
| − | There is a recurring need by VistA software to store data in a translated global for relatively short periods of time. However, this data needs to be accumulated for a period longer than an individual user's logon session and longer than the time a specific process/job might run. The [[GLOBAL UTILITY| ^UTILITY]], [[GLOBAL TMP|^TMP]] and [[GLOBAL XUTL|^XUTL]] globals do not meet the basic requirements for storing this type of data due to the following:
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| − | * These globals are not translated, and thus, cannot be relied upon for transferring data from one job to another.
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| − | * The data is not stored for excessively long periods of time and is constantly being processed and purged.
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| − | * The data is stored in an intermediate form, temporarily, so that it can be further processed in an efficient manner.
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| − | * The original data is stored in a VA FileMan file from which the temporary data can be recreated,
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| − | * or on another system (usually non-VistA) from which it can be resent, if necessary.
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| − | * Hence, the creation of a VA FileMan file, while feasible, would add unnecessary overhead to the VistA systems.
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| − | Therefore, the [[SACC| Standards and Conventions Committee (SACC) ]] asked Kernel to establish the ^XTMP global, which can be used by any VistA software [[application~|Application]]. This global is dynamic in size and activity, with one copy accessible to all members of a [[UCI~|UCI]], and should be placed accordingly.
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| − | Rules for Use of the ^XTMP Global
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| − | The structure of each top node of the ^XTMP global shall have the following format:
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| − | * ^XTMP(namespaced- subscript,0)=purge date^createdate^optional descriptive information (both dates must be in [[Timson Format|VA FileMan internal date format]])
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| − | As per the Standards and Conventions (SAC, Section 2.11.8), developers are encouraged to include other descriptive information on the third piece of the 0 node of the ^XTMP global (e.g., task description and creator DUZ).
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| − | 1. First Subscript Must Be Namespaced
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| − | : The first subscript of the ^XTMP global must be namespaced. However, other characters can follow the namespace. For example, if the namespace for the software is "RA," the first subscript could be "RA"_DUZ, "RA"_literal, "RA"_$J, etc. This allows the developer to use the global in different parts of the software. | |
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| − | 2. 0 Node Must Exist
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| − | : There must be a 0 node for the global in which the first piece contains the PURGE DATE in VA FileMan internal date format,
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| − | : and the second piece contains the CREATE DATE in VA FileMan internal date format.
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| − | :: For example: ^XTMP("RA1",0)=2920416^2920401
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| − | 3. KILL ^XTMP After Use
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| − | : The developer is responsible for KILLing ^XTMP(x) when its use is complete (where "x" is their namespaced subscript).
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| − | 4. Code Cleanup
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| − | : Kernel has included the necessary code in the [[ROUTINE XQ82|XQ82]] routine to clean up the ^XTMP global (e.g., ^XTMP("RA1").
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| − | : It KILLs this global under any of the following conditions:
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| − | :: a) There is no 0 node (e.g., ^XTMP("RA1",0).
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| − | :: b) The 0 node does not contain a purge date as the first piece.
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| − | :: c) The date in the first piece of the 0 node is the same as or before the system date.
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| − | SAC Exemptions
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| − | As of May 17, 2002, the Standards and Conventions (SAC) document has the following exemptions regarding the ^XTMP global:
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| − | : Section 2.3.2.1—Subscripts used in the ^TMP and ^XTMP globals can be lowercase.
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| − | : Section 2.3.2.5—The ^TMP, ^UTILITY, and ^XTMP globals do not have to be VA FileMan compatible.
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| − | : Section 2.3.2.5.2—The ^XTMP global will be translated, with one copy for the entire VistA production system at each site.
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| − | : Section 2.7.3.3—All documented temporary scratch global nodes (e.g., ^TMP and ^UTILITY) are created by a called supported reference, with the exception of ^XTMP global data.
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| − | : Section 2.7.3.4—All local variables, locks, and scratch global nodes (except ^XTMP, or other scratch globals designed to be passed between parts of a package) are created by the [[application~|Application]].
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| − | : A new extension must be added to the SAC stating that this global should be used as a scratch area when a translated scratch global is required by software [[application~|Application]]s.
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| − | To view the entire SAC document, please visit the SACC home page at the following Web address:
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| − | http://vaww.vista.med.va.gov/sacc/
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