Method and apparatus for implementing parallel operations in a database management system
USRE42664E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Jan 5, 2001 |
| Grant date | Aug 30, 2011 |
| Priority date | — |
| Expiry date | Jan 5, 2021 |
Classification
- Technology area (CPC —)General
Abstract
The present invention implements parallel processing in a Database Management System. The present invention provides the ability to locate transaction and recovery information at one location and eliminates the need for read locks and two-phased commits. The present invention provides the ability to dynamically partition row sources for parallel processing. Parallelism is based on the ability to parallelize a row source, the partitioning requirements of consecutive row sources and the entire row source tree, and any specification in the SQL statement. A Query Coordinator assumes control of the processing of a entire query and can execute serial row sources. Additional threads of control, Query Server, execute a parallel operators. Parallel operators are called data flow operators (DFOs). A DFO is represented as structured query language (SQL) statements and can be executed concurrently by multiple processes, or query slaves. A central scheduling mechanism, a data flow scheduler, controls a parallelized portion of an execution plan, and can become invisible for serial execution. Table queues are used to partition and transport rows between sets of processes. Node linkages provide th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.