International Business Machines Corporation

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Kelly W Schlamb

Matthew Albert Huras

Timothy Ray Malkemus

Xun Xue

Ronen Grosman

Aamer U Sachedina

Keriley Kay Romanufa

Nickolay V Tchervenski

Matthew A Huras

Roger L Zheng

Aamer Sachedina

Keriley K Romanufa

John Li

An ordering of operations in log records includes: performing update operations on a database object by a node; writing log records for the update operations into a local buffer by the node, the log records each including a local virtual timestamp; determining that a log flush to write the log records in the local buffer to a persistent storage is to be performed; in response, sending a request from the node to a log flush sequence server for a log flush sequence number; receiving the log flush sequence number by the node; inserting the log flush sequence number into the log records in the local buffer; and performing the log flush to write the log records in the local buffer to the persistent storage, where the log records written to the persistent storage comprises the local virtual timestamps and the log flush sequence number.

Methods to minimize communication in a cluster database system

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Richmond Hill, Canada

Kelly W Schlamb