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Improved JDBC support for sql server

Dr. Dobb's Journal 2006年第1期31卷 26-27页

作者： Oberoi, Herain Microsoft SQL Server Team

The sql server development team is planning to release a latest Java Database Connectivity (JDBC) driver for both sql server 2000 and sql server 2005: the microsoft sql server 2005 JDBC Driver. Based on the uptake, feedback and usage of the sql server 2000 JDBC driver, the team is providing enterprise-class JDBC connectivity and support for sql server, along with a map to ensure that the latest JDBC spec implementations are available to sql server customers as the specification evolves. A major update to the driver is the ISV-friendly licensing structure that enables the driver to be freely redistributable for all registered patterns. It includes several improvements in performance, transactions, and deep support for the latest sql server 2005 types.

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Instant Recovery with Write-Ahead Logging: Page Repair, System Restart, Media Restore, and System Failover, Second Edition

引用

2016年

作者： Goetz Graefe Wey Guy Caetano Sauer

ISBN: (数字)9781627054201

Traditional theory and practice of write-ahead logging and of database recovery focus on three failure classes: transaction failures (typically due to deadlocks) resolved by transaction rollback; system failures (typically power or software faults) resolved by restart with log analysis, "redo," and "undo" phases; and media failures (typically hardware faults) resolved by restore operations that combine multiple types of backups and log replay. The recent addition of single-page failures and single-page recovery has opened new opportunities far beyond the original aim of immediate, lossless repair of single-page wear-out in novel or traditional storage hardware. In the contexts of system and media failures, efficient single-page recovery enables on-demand incremental "redo" and "undo" as part of system restart or media restore operations. This can give the illusion of practically instantaneous restart and restore: instant restart permits processing new queries and updates seconds after system reboot and instant restore permits resuming queries and updates on empty replacement media as if those were already fully recovered. In the context of node and network failures, instant restart and instant restore combine to enable practically instant failover from a failing database node to one holding merely an out-of-date backup and a log archive, yet without loss of data, updates, or transactional integrity. In addition to these instant recovery techniques, the discussion introduces self-repairing indexes and much faster offline restore operations, which impose no slowdown in backup operations and hardly any slowdown in log archiving operations. The new restore techniques also render differential and incremental backups obsolete, complete backup commands on a database server practically instantly, and even permit taking full up-to-date backups without imposing any load on the database server. Compared to the first version of this book, this second edition adds sections

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