Method and apparatus for chunk based transaction logging with asynchronous input/output for a database management system
First Claim
1. A method of storing transaction data for a plurality of database applications in a multiple access database management system having permanent storage and a transaction log buffer to store data for said database applications before transferring said data to said permanent storage, wherein database connection agents associated with said applications are used to store data in said transaction log buffer, comprising:
- granting exclusive write access reservations in said transaction log buffer to a plurality of said database connection agents; and
, allowing database connection agents to write transaction data records to previously granted write access reservations while granting exclusive access reservations to other database connection agents.
1 Assignment
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Accused Products
Abstract
A method and apparatus are provided for storing transaction data for a plurality of database applications in a multiple access database management system having permanent storage and a transaction log buffer to store data for said database applications before transferring said data to said permanent storage, wherein database connection agents associated with said applications are used to store data in said transaction log buffer, including granting exclusive write access reservations in said transaction log buffer to a plurality of said database connection agents; and allowing database connection agents to write transaction data records to previously granted write access reservations while granting exclusive access reservations to other database connection agents.
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Citations
38 Claims
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1. A method of storing transaction data for a plurality of database applications in a multiple access database management system having permanent storage and a transaction log buffer to store data for said database applications before transferring said data to said permanent storage, wherein database connection agents associated with said applications are used to store data in said transaction log buffer, comprising:
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granting exclusive write access reservations in said transaction log buffer to a plurality of said database connection agents; and
,allowing database connection agents to write transaction data records to previously granted write access reservations while granting exclusive access reservations to other database connection agents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 38)
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13. A method of storing transaction data for a multiplicity of database applications in a multiple access database management system having permanent storage and a transaction log buffer, having a buffer latch to ensure exclusive access for establishing reservations, said transaction log buffer being adapted to store data for said database applications before transferring said data to said permanent storage, wherein database connection agents associated with said database applications are used to store data in said transaction log buffer, comprising:
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granting control of said buffer latch at a first position in said transaction log buffer to a first database connection agent requesting write access to write a predetermined transaction data record to said transaction buffer;
determining the size of said data record;
updating the position of said log buffer offset while holding the buffer latch to a second position to define a first data reservation in said transaction log buffer between said first and second positions corresponding to the size of said data record;
granting exclusive write access to said first data reservation to said first database connection agent;
releasing said control of said latch from said first database connection agent;
granting control of said buffer latch at said second position in said transaction log buffer to a second database connection agent;
allowing said first database connection agent to copy said predetermined transaction data record into said first data reservation.
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28. Apparatus for storing transaction data for a plurality of database applications in a multiple access database management system having permanent storage and a transaction log buffer to store data for said database applications before transferring said data to said permanent storage, wherein database connection agents associated with said applications are used to store data in said transaction log buffer, comprising:
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means for granting exclusive write access reservations in said transaction log buffer to a plurality of said database connection agents; and
,means for allowing database connection agents to write transaction data records to previously granted write access reservations while granting exclusive access reservations to other database connection agents.
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33. An article comprising:
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a computer-readable signal bearing medium wherein said medium is a recordable data storage medium or a modulated carrier signal;
means in the medium for storing transaction data for a plurality of database applications in a multiple access database management system having permanent storage and a transaction log buffer to store data for said database applications before transferring said data to said permanent storage, wherein database connection agents associated with said applications are used to store data in said transaction log buffer, comprising;
means for granting exclusive write access reservations in said transaction log buffer to a plurality of said database connection agents; and
,means for allowing database connection agents to write transaction data records to previously granted write access reservations while granting exclusive access reservations to other database connection agents. - View Dependent Claims (34, 35, 36, 37)
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Specification