Data set index record preservation

• US 8,392,423 B2
• Filed: 07/02/2010
• Issued: 03/05/2013
• Est. Priority Date: 07/02/2010
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Reed, David C., Smith, Max D., Belisle, Jon C.
• Primary Examiner(s): TRUONG, CAM Y T
• Application Number:
  US12/829,893
• Publication Number:
  US 20120005528A1
• Time in Patent Office: 977 Days
• Field of Search: 707/741, 707/668, 707/999.203
• US Class Current: 707/741
• CPC Class Codes: G06F 11/1435 using file system or storage system metadata
• CPC Class Codes: G06F 11/1446 Point-in-time backing up or restoration of persistent data
• CPC Class Codes: G06F 16/22 Indexing; Data structures therefor; Storage structures
• CPC Class Codes: G06F 16/23 Updating

Abstract

Various embodiments for preserving data set information in a computing storage environment are provided. In one such embodiment, at least one of a selected portion of an index record of the dataset is stored as a record in a subindex data set. The at least one component of the subindex data set is recoverable into the index record in an event of an error detected within the index record.

Claims

1. A method for preserving data set information in a computing storage environment by a processor device, comprising:

pulling portions of index information from a name directory and an attribute directory to form a new subindex data set that is stored as a separate file from the name directory and the attribute directory, the name directory and the attribute directory each being associated with partitioned data set extended (PDSE) data sets stored sequentially in members, and the new subindex data set being associated with the PDSE data sets via a catalog entry;

pursuant to an update to the PDSE data sets, storing at least one of a selected portion of an index record of the dataset as a record in the new subindex data set, wherein the step of storing at least one portion includes acting on an integrated catalog facility (ICF) catalog to perform operations relating to allowacation and maintenance of the new subindex data set;

combining a name and a last update field of the index record as a key of the record in the new subindex data set;

combining an extent location and a size field of the index record as data of the record in the new subindex data set;

replacing an oldest existing record with a most recent version if a determination is made that adding the most recent version exceeds a predetermined number of versions, wherein at least one component of the new subindex data set is recoverable into the index record in an event of an error detected within the index record; and

referring to the new subindex data set to determine a historical change of an index comprising at least the index record to discover a source of an index corruption, in an event the index is corrupted, wherein the step of referring to the new subindex data set includes referring to the extent location and the size field data in the new subindex data set to determine the historical change of the index comprising at least the index record from reviewing each version of the predetermined number of versions to discover the source of an index corruption.

2. The method of claim 1, further including pulling the at least one of the selected portion from the index record.

3. The method of claim 1, further including storing another selected portion of the index record of the dataset in the new subindex data set.

4. The method of claim 1, further including, pursuant to an update of the index record, performing at least one of updating the at least one component of the new subindex data set and storing the at least one of the selected portion of the index record as an additional version of the at least one component of the new subindex data set.

5. The method of claim 1, further comprising regenerating portions of the index from the data of the records in the new subindex data set to allow a user continued access to the data, in an event the index is corrupted.

6. The method of claim 1, further comprising obtaining the name, the extent location, and the size field are from the name directory, and the last update field from the name directory.

7. A system for preserving data set information in a computing storage environment, comprising:

a processor; and

a data storage device in communication with the processor including a data set module operational in the computing storage environment,

wherein the data set module for;

pulling portions of index information from a name directory and an attribute directory to form a new subindex data set that is stored as a separate file from the name directory and the attribute directory, the name directory and the attribute directory each being associated with partitioned data set extended (PDSE) data sets stored sequentially in members, and the new subindex data set being associated with the PDSE data sets via a catalog entry,

pursuant to an update to the PDSE data sets, storing at least one of a selected portion of an index record of dataset as a record in the new subindex data set, wherein the step of storing at least one portion includes acting on an integrated catalog facility (ICF) catalog to perform operations relating to allowacation and maintenance of the new subindex data set;

combining a name and a last update field of the index record as a key of the record in the new subindex data set,

combining an extent location and a size field of the index record as data of the record in the new subindex data set,

replacing an oldest existing record with a most recent version if a determination is made that adding the most recent version exceeds a predetermined number of versions, wherein at least one component of the new subindex data set is recoverable into the index record in an event of an error detected within the index record, and

referring to the new subindex data set to determine a historical change of an index comprising at least the index record to discover a source of an index corruption, in an event the index is corrupted, wherein the step of referring to the new subindex data set includes referring to the extent location and the size field data in the new subindex data set to determine the historical change of the index comprising at least the index record from reviewing each version of the predetermined number of versions to discover the source of an index corruption.

8. The system of claim 7, wherein the data set module is further for pulling the at least one of the selected portion from the index record.

9. The system of claim 7, wherein the data set module is further for, pursuant to an update of the index record, performing at least one of updating the at least one component of the new subindex data set and storing the at least one of the selected portion of the index record as an additional version of the at least one component of the new subindex data set.

10. A computer program product preserving data set information in a computing storage environment, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:

a first executable portion for pulling portions of index information from a name directory and an attribute directory to form a new subindex data set that is stored as a separate file from the name directory and the attribute directory, the name directory and the attribute directory each being associated with partitioned data set extended (PDSE) data sets stored sequentially in members, and the new subindex data set being associated with the PDSE data sets via a catalog entry,

a second executable portion for, pursuant to an update to the PDSE data sets, storing at least one of a selected portion of an index record of dataset as a record in the new subindex data set, wherein the step of storing at least one portion includes acting on an integrated catalog facility (ICF) catalog to perform operations relating to allowacation and maintenance of the new subindex data set;

a third executable portion for combining a name and a last update field of the index record as a key of the record in the new subindex data set;

a fourth executable portion for combining an extent location and a size field of the index record as data of the record in the new subindex data set;

a fifth executable portion for replacing an oldest existing record with a most recent version if a determination is made that adding the most recent version exceeds a predetermined number of versions, wherein at least one component of the new subindex data set is recoverable into the index record in an event of an error detected within the index record; and

a sixth executable portion for referring to the new subindex data set to determine a historical change of an index comprising at least the index record to discover a source of an index corruption, in an event the index is corrupted, wherein the step of referring to the new subindex data set includes referring to the extent location and the size field data in the new subindex data set to determine the historical change of the index comprising at least the index record from reviewing each version of the predetermined number of versions to discover the source of an index corruption.

11. The computer program product of claim 10, further including a seventh executable portion for pulling the at least one of the selected portion from the index record.

12. The computer program product of claim 10, further including a seventh executable portion for, pursuant to an update of the index record, performing at least one of updating the at least one component of the new subindex data set and storing the at least one of the selected portion of the index record as an additional version of the at least one component of the new subindex data set.