Dynamic record management for systems utilizing virtual storage access method (VSAM) data sets with a corresponding VSAM control block structure

Patent metadata

Field	Value
Publication number	US-8949286-B2
Application number	US-201313767653-A
Country	US
Kind code	B2
Filing date	Feb 14, 2013
Priority date	Aug 30, 2011
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

When using virtually stored data sets, such as virtual storage access method (VSAM) data sets, while the data set is open (referred to as an open time) static data set characteristics and/or job parameters have been defined for the VSAM data set. In one approach, a method for modifying a virtual storage access method (VSAM) data set includes opening a VSAM data set; and modifying a VSAM control block structure for the VSAM data set.

First claim

What is claimed is:

1. A method for modifying a virtual storage access method (VSAM) data set, the method comprising:
opening, using a processor, a VSAM data set;
providing, using the processor, a VSAM dynamic address space associated with the VSAM data set; and
modifying, using the processor, a VSAM control block structure for the VSAM data set using the VSAM dynamic address space while the VSAM data set is open during an open time in which static data set characteristics and/or job parameters have been defined for the VSAM data set,
wherein the modifying the VSAM control block structure further comprises:
interacting with the VSAM data set within the VSAM dynamic address space using a VSAM console interface and/or a VSAM programming interface; and
building a service request block based on the VSAM dynamic address space,
wherein the service request block modifies the VSAM control block structure within the VSAM dynamic address space.

2. The method as recited in claim 1 , wherein interacting with the VSAM data set within the VSAM dynamic address space comprises at least one of:
changing one or more parameters of at least one associated job;
changing at least one VSAM data set characteristic; and
dynamically enabling at least one VSAM record management trace in any address space.

3. The method as recited in claim 2 , wherein the at least one data set characteristic includes one or more of:
allocation of buffers;
deallocation of buffers;
record properties;
a data set size; and
string properties.

4. The method as recited in claim 1 , further comprising:
executing an application, the application processing the VSAM data set and building the VSAM control block structure for the VSAM data set; or
locating the VSAM control block structure.

5. The method as recited in claim 1 , wherein interacting with the VSAM data set within the VSAM dynamic address space comprises indicating results of the modification of the VSAM control block structure.

6. The method as recited in claim 1 , wherein interacting with the VSAM data set within the VSAM dynamic address space occurs while the VSAM data set is open.

7. A method for modifying a data set, the method comprising:
opening, using the processor, a virtually stored data set;
providing, using the processor, a dynamic address space associated with the virtually stored data set;
interacting, using the processor, with the virtually stored data set within the dynamic address space using a console interface and/or a programming interface;
building, using the processor, a service request block based on the dynamic address space; and
modifying, using the processor, a virtually stored control block structure for the virtually stored data set within the dynamic address space using the service request block.

8. The method as recited in claim 7 , further comprising:
executing an application, the application being configured to process the virtually stored data set; and
building the virtually stored control block structure for the virtually stored data set prior to modifying the virtually stored control block structure using the service request block.

9. The method as recited in claim 7 , further comprising:
executing an application, the application being configured to process the virtually stored data set; and
locating the virtually stored control block structure associated with the virtually stored data set as it is processed by the application.

10. The method as recited in claim 7 , wherein interacting with the virtually stored data set within the dynamic address space comprises indicating results of the modification of the virtually stored control block structure.

11. The method as recited in claim 7 , wherein interacting with the virtually stored data set within the dynamic address space occurs while the virtually stored data set is open.

12. The method as recited in claim 7 , wherein interacting with the virtually stored data set within the dynamic address space comprises at least one of:
changing one or more parameters of at least one associated job of the virtually stored data set;
changing at least one characteristic of the virtually stored data set; and
dynamically enabling at least one record management trace in any address space.

13. The method as recited in claim 12 , wherein the at least one characteristic of the virtually stored data set includes one or more of:
allocation of buffers;
deallocation of buffers;
record properties;
a size of the virtually stored data set; and
string properties.

Assignees

• IBM

Inventors

• Ho Kam H
• Pandya Maya P

Classifications

• G06F9/45558 Primary

  Hypervisor-specific management and integration aspects · CPC title

• G06F3/064 Primary

  Management of blocks · CPC title

• G06F3/06

  Digital input from, or digital output to, record carriers {, e.g. RAID, emulated record carriers or networked record carriers} · CPC title

• G06F12/06

  Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication (G06F12/08 takes precedence) · CPC title

• G06F3/0674

  Disk device · CPC title