Multi-level read caching for multiplexed transactional logging

Details Multi-level read caching for multiplexed transactional logging Multi-level read caching for multiplexed transactional logging

2006-12-04

2011-12-06

Bragdon, Reginald (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S118000, C711S220000, C711SE12017

Reexamination Certificate

active

08074027

ABSTRACT:
A transactional logging service is provided to user-mode and kernel-mode log clients by utilizing a marshalling area to buffer a set of log records that a log client assembles into a log stream. Disk I/O (input/output) functionality is then separately brokered using a kernel-mode address space for a single dedicated physical log, or virtual logs multiplexed to a single log, which is written to stable storage that contains log records from across all of the log streams. Physical log writes are handled by a shared log flush queue and physical log reads are provided by a file system cache that underlies the service. A multi-level cache hierarchy is utilized when a log client needs to access a log record. A series of caches are queried in order of increasing latency until the targeted log record is located. The target log record is only read from disk in the event that it missed at each cache in the hierarchy.

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