Data expanse using memory-mapped files on a system architecture interface layer-based mainframe operating system

Abstract

Systems and methods for obtaining access to database files m a computing system. A method may include receiving a first call from a database management system requesting access to a database file. The method may further include transmitting a second call to an operating system interface requesting that a memory-mapped data expanse file be created. The method may also include receiving a first address representing the database file in response to successful mapping of the database file to the memory-mapped data expanse file located at the operating system interface.

What is claimed is: 
     
         1 . A method for obtaining access to database files in a computing system, comprising:
 receiving, at an operating system, a first call from a database management system requesting access to a database file;   transmitting, from the operating system, a second call to an operating system interface requesting that a memory-mapped data expanse file be created; and   receiving, at the operating system, a first address representing the database file in response to successful mapping of the database file to the memory-mapped data expanse file located at the operating system interface.   
     
     
         2 . The method of  claim 1 , further comprising:
 transmitting, from the operating system, the first address to the database management system;   receiving, at the operating system, a third call from the database management system, wherein the third call specifies an address and a size of a view of the database file to be created; and   transmitting, from the operating system, a second address to the database management system, wherein the second address represents the address of the view of the database file from the memory-mapped data expanse file.   
     
     
         3 . The method of  claim 2 , wherein second address comprises an extended mode virtual address. 
     
     
         4 . The method of  claim 1 , further comprising converting the received first call from a call compatible with the operating system to a call compatible with the operating system interface, wherein the second call comprises the call compatible with the operating system interface. 
     
     
         5 . The method of  claim 1 , wherein the database file has a size greater than an address range available to the database management system. 
     
     
         6 . The method of  claim 1 , wherein a plurality of memory-mapped data expanse files are located at the operating system interface, and wherein each memory-mapped data expanse file of the plurality of memory-mapped data expanse files represents a different mapping to a different database file. 
     
     
         7 . The method of  claim 1 , wherein the database file is physically stored in an external disk. 
     
     
         8 . A computer program product, comprising:
 a non-transitory computer-readable medium comprising instructions which, when executed by a processor of a computing system, cause the processor to perform the steps of:
 receiving a first call from a database management system requesting access to a database file; 
 transmitting a second call to an operating system interface requesting that a memory-mapped data expanse file be created; and 
 receiving a first address representing the database file in response to successful mapping of the database file to the memory-mapped data expanse file located at the operating system interface. 
   
     
     
         9 . The computer program product of  claim 8 , wherein the medium further comprises instructions to cause the processor to perform the steps of:
 transmitting the first address to the database management system;   receiving a third call from the database management system, wherein the third call specifies an address and a size of a view of the database file to be created; and   transmitting a second address to the database management system, wherein the second address represents the address of the view of the database file from the memory-mapped data expanse file.   
     
     
         10 . The computer program product of  claim 9 , wherein the second address comprises an extended mode virtual address. 
     
     
         11 . The computer program product of  claim 8 , wherein the medium further comprises instructions to cause the processor to perform the step of converting the received first call from a call compatible with the operating system to a call compatible with the operating system interface, wherein the second call comprises the call compatible with the operating system interface. 
     
     
         12 . The computer program product of  claim 8 , wherein the database file has a size greater than an address range available to the database management system. 
     
     
         13 . The computer program product of  claim 8 , wherein a plurality of memory-mapped data expanse files are located at the operating system interface, and wherein each memory-mapped data expanse file of the plurality of memory-mapped data expanse files represents a different mapping to a different database file. 
     
     
         14 . The computer program product of  claim 8 , wherein the database file is physically stored. in an external disk. 
     
     
         15 . An apparatus, comprising:
 a memory; and   a processor coupled to the memory, the processor configured to execute the steps of:
 receiving a first call from a database management system requesting access to a database file; 
 transmitting a second call to an operating system interface requesting that a memory-mapped data expanse file be created; and 
 receiving a first address representing the database file in response to successful mapping of the database file to the memory-mapped data expanse file located at the operating system interface. 
   
     
     
         16 . The apparatus of  claim 15 , wherein the processor is further configured to perform the steps of:
 transmitting the first address to the database management system;   receiving a third call from the database management system, wherein the third call specifies an address and a size of a view of the database file to be created; and   transmitting a second address to the database management system, wherein the second address represents the address of the view of the database file from the memory-mapped data expanse file.   
     
     
         17 . The apparatus of  claim 16 , wherein the second address comprises an extended mode virtual address. 
     
     
         18 . The apparatus of  claim 15 , wherein the processor is further configured to perform the step of converting the received first call from a call compatible with the operating system to a call compatible with the operating system interface, wherein the second call comprises the call compatible with the operating system interface. 
     
     
         19 . The apparatus of  claim 15 , wherein the database file has a size greater than an address range available to the database management system, and wherein the database file is physically stored in an external disk. 
     
     
         20 . The apparatus of  claim 15 , wherein a plurality of memory-mapped data expanse files are located at the operating system interface, and wherein each memory-mapped data expanse file of the plurality of memory-mapped data expanse files represents a different mapping to a different database file.