Asynchronous operation in a database management system

• US 5,224,212 A
• Filed: 05/01/1989
• Issued: 06/29/1993
• Est. Priority Date: 05/01/1989
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Oprescu, Valentin, Rosenthal, Robert S.
• Primary Examiner(s): Kulik, Paul V.
• Application Number:
  US07/345,586
• Time in Patent Office: 1,520 Days
• Field of Search: 364/200 MS File, 364/900 MS File, 395/600, 395/250
• US Class Current: 710/53
• CPC Class Codes: G06F 9/546 Message passing systems or structures, e.g. queues
• CPC Class Codes: Y10S 707/99931 Database or file accessing

Abstract

A real-time database management system in which data generated by a producer process is buffered in a plurality of update buffers and transmitted asynchronously into a consumer process, such as a database management system, so that neither the producer process nor the consumer process has to halt operations during I/O requests and data is not lost.

Claims

1. In a data-processing system comprising a producer process generating data, a database management system responsive to said producer process and controlling the storage of said data in an associated database, a method for storing said data in said database comprising the steps of:

a) receiving a first portion of said data from said producer process;

b) placing said first portion of said data in a first of a plurality of data buffers;

c) transferring said first portion of data from said first buffer into said database while receiving a second portion of said data from said producer process and placing said second portion of said data in a second of a plurality of data buffers; and

d) transferring said second portion of data from said second buffer into said database.

2. The method recited in claim 1, wherein steps b) and c) comprise assigning unique tags to the entire contents of said data buffers as said portions of data are placed therein.

3. The method recited in claim 2, further comprising the step of generating an error message comprising the unique tag of the corresponding data buffer contents if the step of transferring said data results in an error.

4. In a data-processing system comprising a producer process generating data, a database management system responsive to said producer process and controlling the storage of said data in an associated database, a method for storing said data in said database comprising the steps of:

a) receiving a first portion of said data from said producer process;

b) placing said first portion of said data in a first of a plurality of data buffers;

c) transferring said first portion of data from said first buffer into said database while receiving a second portion of said data from said producer process and placing said second portion of said data in a second of a plurality of data buffers;

d) transferring said second portion of data from said second buffer into said database while receiving a third portion of said data from said producer process and placing said third portion of said data in said first of said plurality of data buffers.

5. The method recited in claim 4, wherein steps b) through d) comprise assigning unique tags to the entire contents of said data buffers as said portions of data are placed therein.

6. The method recited in claim 5, further comprising the step of generating an error message comprising the unique tag of the corresponding data buffer contents if the step of transferring said data results in an error.

7. In a data-processing system comprising a producer process generating data, a database management system responsive to said producer process and controlling the storage of said data in an associated database, a method for storing said data in said database comprising the steps of:

a) receiving a first portion of said data from said producer process;

b) placing said first portion of said data in a first of a plurality of data buffers;

c) transferring said first portion of data from said first buffer into said database while receiving a second portion of said data from said producer process and placing said second portion of said data in a second of a plurality of data buffers;

d) transferring said second portion of data from said second buffer into said database while receiving a third portion of said data from said producer process and placing said third portion of said data in an empty one of said plurality of data buffers;

e) repeating steps a) through d) until all of said data has been transferred to said database.

8. The method recited in claim 7, wherein steps b) through d) comprise assigning unique tags to the entire contents of said data buffers as said portions of data are placed therein.

9. The method recited in claim 8, further comprising the step of generating an error message comprising the unique tag of the corresponding data buffer contents if the step of transferring said data results in an error.