Methods and systems for data moving using locks

• US 7,653,667 B2
• Filed: 09/04/2003
• Issued: 01/26/2010
• Est. Priority Date: 09/09/2002
• Status: Expired due to Term

• Current Assignee: SAP SE
• Original Assignee: SAP AG (SAP SE)
• Inventors: Fischer, Martin, Pferdekaemper, Thorsten
• Primary Examiner(s): Alam; Hosain T
• Assistant Examiner(s): LIN, SHEW FEN
• Application Number:
  US10/526,748
• Publication Number:
  US 20060242203A1
• Time in Patent Office: 2,336 Days
• Field of Search: 707/204
• US Class Current: 707/640
• CPC Class Codes: G06F 9/526 Mutual exclusion algorithms

Abstract

Methods, computer readable medium and systems are provided for moving data objects from a first storage location to a second storage location. One or more data objects may be selected having an identifier from a first storage location. The ID may be stored in at least one transactional type lock object. Systems and methods consistent with the invention may determine whether a permanent type lock exists for a data object. If the permanent type lock does exist, systems and methods consistent with the invention may store the data object, the ID of which is contained in the at least one transactional type lock object, at the second storage location, store the ID of that data object in a permanent type lock object, assign the second storage location to the ID in the at least one permanent type lock object, and delete the ID of that data object in the transactional type lock object.

Claims

1. A method for moving data objects in a computer system from a first storage location to a second storage location, comprising:

selecting a data object stored in the first storage location;

storing an identifier (ID) of the data object in a transactional type lock object;

determining whether another process is moving the data object to the second storage location by determining whether the ID is stored in a permanent type lock object; and

when the ID is not stored in the permanent type lock object and another process is not moving the data object to the second storage location, checking whether the data object is archiveable before storing the data object at the second storage location;

when the data object is archiveable;

storing the data object at the second storage location;

storing the ID in the permanent type lock object;

assigning the second storage location to the ID stored in the permanent type lock object; and

deleting the ID stored in the transactional type lock object.

2. The method of claim 1, further comprising:

deleting the data object from the first storage location; and

deleting the ID from the permanent type lock object after the data object has been deleted from the first storage location.

3. The method of claim 1, wherein the data object is stored in one or more files and wherein an assignment of the ID to the one or more files is stored in the permanent type lock object.

4. The method of claim 1, wherein:

the first storage location stores one or more data objects; and

one or more IDs of the one or more data objects are stored in the transactional type lock object immediately after selecting the one or more data objects.

5. The method of claim 1, wherein the ID is stored in the transactional type lock object before the data object is stored at the second storage location.

6. The method of claim 1, wherein:

the first storage location stores one or more data objects; and

IDs of all of the one or more data objects are stored in the permanent type lock object before storing any of the one or more data objects at the second storage location.

7. The method of claim 1, further comprising:

when the ID is stored in the permanent type lock object and another process is moving the data object to the second storage location, deleting the ID in the transactional type lock object.

8. The method of claim 1, further comprising:

determining whether the data object was stored successfully at the second storage location; and

when the data object has not been successfully stored at the second storage location, deleting the ID from the permanent type lock object.

9. The method of claim 1 for use in an enterprise resource planning software.

10. A computer system for processing data comprising:

a memory device for storing program instructions;

an input device for entering data;

a storage for storing data;

a processor responsive to the program instructions, wherein the program instructions comprise program code means for performing a method for moving data objects in the computer system from a first storage location to a second storage location, the method comprising;

selecting a data object stored in the first storage location;

storing an identifier (ID) of the data object in a transactional type lock object;

determining whether another process is moving the data object to the second storage location by determining whether the ID is stored in a permanent type lock object; and

when the ID is not stored in the permanent type lock object and another process is not moving the data object to the second storage location, checking whether the data object is archiveable before storing the data object at the second storage location;

when the data object is archiveable;

storing the data object at the second storage location;

storing the ID in the permanent type lock object;

assigning the second storage location to the ID stored in the permanent type lock object; and

deleting the ID stored in the transactional type lock object.

11. A computer readable medium comprising instructions for performing a method for moving data objects in a computer system from a first storage location to a second storage location, the method comprising:

selecting a data object stored in the first storage location;

storing an identifier (ID) of the data object in a transactional type lock object;

determining whether another process is moving the data object to the second storage location by determining whether the ID is stored in a permanent type lock object; and

when the ID is not stored in the permanent type lock object and another process is not moving the data object to the second storage location, checking whether the data object is archiveable before storing the data object at the second storage location;

when the data object is archiveable;

storing the data object at the second storage location;

storing the ID in the permanent type lock object;

assigning the second storage location to the ID stored in the permanent type lock object; and

deleting the ID stored in the transactional type lock object.

12. The computer readable medium of claim 11, wherein the method further comprises:

deleting the data object from the first storage location; and

deleting the ID from the permanent type lock object after the data object has been deleted from the first storage location.

13. The computer readable medium of claim 11, wherein the data object is stored in one or more files and wherein an assignment of the ID to the one or more files is stored in the permanent type lock object.

14. The computer readable medium of claim 11, wherein:

the first storage location stores one or more data objects; and

one or more IDs of the one or more data objects are stored in the transactional type lock object immediately after selecting the one or more data objects.

15. The computer readable medium of claim 11, wherein the ID is stored in the transactional type lock object before the data object is stored at the second storage location.

16. The computer readable medium of claim 11, wherein:

the first storage location stores one or more data objects; and

IDs of all of the one or more data objects are stored in the permanent type lock object before storing any of the one or more data objects at the second storage location.

17. The computer readable medium of claim 11, wherein the method further comprises:

when the ID is stored in the permanent type lock object and another process is moving the data object to the second storage location, deleting the ID in the transactional type lock object.

18. The computer readable medium of claim 11, wherein the method further comprises:

determining whether the data object was stored successfully at the second storage location; and

when the data object has not been successfully stored at the second storage location, deleting the ID from the permanent type lock object.

19. A computerized system for moving data objects from a first storage location to a second storage location, comprising:

a storage for storing instructions;

a processor for processing the instructions;

means for selecting a data object stored in the first storage location;

means for storing an identifier (ID) of the data object in a transactional type lock object;

means for determining whether another process is moving the data object to the second storage location by determining whether the ID is stored in a permanent type lock object; and

means for, when the ID is not stored in the permanent type lock object and another process is not moving the data object to the second storage location, checking whether the data object is archiveable before storing the data object at the second storage location;

means for, when the data object is archiveable;

storing the data object at the second storage location;

storing the ID in the permanent type lock object;

assigning the second storage location to the ID stored in the permanent type lock object; and

deleting the ID stored in the transactional type lock object.

20. The computerized system of claim 19, further comprising:

means for deleting the data object from the first storage location; and

means for deleting the ID from the permanent type lock object after the data object has been deleted from the first storage location.

21. The computerized system of claim 19, wherein the data object is stored in one or more files and wherein an assignment of the ID to the one or more files is stored in the permanent type lock object.

22. The computerized system of claim 19, wherein:

the first storage location stores one or more data objects; and

one or more IDs of the one or more data objects are stored in the transactional type lock object immediately after selecting the one or more data objects.

23. The computerized system of claim 19, wherein the ID is stored in the transactional type lock object before the data object is stored at the second storage location.

24. The computerized system of claim 19, wherein:

the first storage location stores one or more data objects; and

IDs of all of the one or more data objects are stored in the permanent type lock object before storing any of the one or more data objects at the second storage location.

25. The computerized system of claim 19, further comprising:

means for, when the ID is stored in the permanent type lock object and another process is moving the data object to the second storage location, deleting the ID in the transactional type lock object.

26. The computerized system of claim 19, further comprising:

means for determining whether the data object was stored successfully at the second storage location; and

means for, when the data object has not been successfully stored at the second storage location, deleting the ID from the permanent type lock object.

27. A method for moving data objects from a first storage location to a second storage location, the method comprising:

selecting a data object stored in the first storage location;

determining whether another process is attempting to perform a transaction with the data object by determining whether an identifier (ID) of the data object is stored in a transactional type lock object;

when the ID is not stored in the transactional type lock object and another process is not attempting to perform a transaction with the data object, storing the ID in the transactional type lock object;

determining whether another processing is moving the data object to the second storage location by determining whether the ID is stored in a permanent type lock object;

when the ID is not stored in the permanent type lock object and another process is not moving the data object to the second storage location, determining whether the data object is archiveable, the data object being archiveable if the data object is readable, complete, and error-free;

when the data object is archiveable;

storing the ID in the permanent type lock object;

storing the data object at the second storage location;

assigning the second storage location to the ID in the permanent type lock object;

deleting the data object from the first storage location; and

deleting the ID stored in the permanent type lock object; and

deleting the ID stored in the transactional type lock object.