International Business Machines Corporation

Andrew David Buckler

Matthew Albert Huras

Aamer U Sachedina

David Alan Hepkin

Christian Marcelo Garcia-Arellano

Xun Xue

Keriley Kay Romanufa

Dale Murray McInnis

James Liam Finnie

Stewart L Palmer

Steve Raspudic

Roger L Zheng

Anand Subramanian

Subho Chatterjee

A method, computer program product, and system for detecting and fencing off a failed entity instance so that failover time in the computing system is reduced. Upon detection of a failed entity, for example a failed process, a signal handler invokes an operating system interface to fence off the failed instance from modifying its persistent state, so that the entity may be re-instantiated prior to termination of the failed instance. This approach reduces failover time and eliminates split-brain problems without compromising access to the failed instance to obtain diagnostic information, core dumps, and the like.

Failure detection and fencing in a computing system

A system and method for managing shared resources is disclosed. The system includes a primary coherency processing unit which processes lock requests from a plurality of data processing hosts, the primary coherency processing unit also storing a first current lock state information for the plurality of data processing hosts, the first current lock state information including a plurality of locks held by the plurality of data processing hosts. The system further includes a standby coherency processing unit storing fewer locks than the primary coherency processing unit, the locks stored by the standby coherency processing unit being a subset of locks included in the first current lock state information, the standby coherency unit configured to perform a plurality of activities of the primary coherency processing unit using the subset of locks in response to a failure of the primary coherency processing unit.

Improving data availability during failure detection and recovery processing in a shared resource system

A computer data processing system and an article of manufacture for determining database workload periodicity. The computer data processing system includes a module for converting database activity samples spanning a time period from the dime domain to the frequency domain, the converting resulting in a frequency spectrum, a module for identifying fundamental peaks of the frequency spectrum, and a module for allocating database resources based on at least one of the fundamental peaks.

Workload periodicity analyzer for autonomic database components

Generating in a computer system and deploying a data model of a plurality of database cluster configuration availability solutions over a computer network by creating a database cluster configuration modeling specification including objects contained in a unified model language diagram providing a definition of a database cluster configuration data model. Creating the database cluster configuration data model using the database cluster configuration modeling specification and upon receiving signals from a graphical user interface or from XML batch data files or from application programming interfaces, indicating the definition of the cluster configuration model. After creating the graphical database cluster configuration data model, constraints that specify a valid logical configuration are validated and the solution is transformed into data understandable by database cluster manager software applications and then transmitted over a network to multiple cluster manager targets to be incorporated as database cluster configuration availability solutions.

Systems, methods and computer products for database cluster modeling

A data processing system implemented method for determining database workload periodicity. The data processing system implemented method includes converting database activity samples spanning a time period from the dime domain to the frequency domain, the converting resulting in a frequency spectrum, identifying fundamental peaks of the frequency spectrum, and allocating database resources based on at least one of the fundamental peaks.

Workload periodcity analyzer for autonomic database components

Growing community of inventors

Markham, Canada

Andrew David Buckler