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为父亲祈祷!

[不指定 2009/05/07 13:40 | by askwan ]
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Backtrack
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看到系统界面里 用中文繁体写就的 “龙” 字,倍觉亲切吧 呵呵

喜欢研究安全技术的linux fans不容错过!

最新发行版已经到 BackTrack 4 beta release  
1DVD 854 MB  同时又集成众多老的安全工具和最近最新的安全工具
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其同时也是无线网络破解集成工具箱!非常适合蹭网族,呵呵
最近拿来蹭办公楼附近的无线资源,甚觉强悍!
发此文,以推荐linux安全爱好者

最新版下载地址:
http://backtrack.unixheads.org/bt4-beta.iso
vmware镜像:
http://backtrack.unixheads.org/bt4-beta-vm-6.5.1.rar
innodb到现在还是mysql下最主要的支持事务的存储引擎,那么好,现在我们又多了一种选择了,
一种新的事务存储引擎 PBXT Storage Engine

以后mysql的主要存储引擎架构趋势已成:
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这是原作者对这种存储引擎的总结:
Quotation
PrimeBase XT (PBXT) is a transactional storage engine for MySQL which can be loaded dynamically by the pluggable storage engine API of MySQL 5.1. It has been designed for modern, web-based, high concurrency environments. Full MVCC (multi-version concurrency control) support and a unique "write-once" strategy make PBXT particularly effective under heavy update loads.


先来看一下PBXT的架构吧:
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AICD特性完整支持! 众多特性:

Quotation
1. MVCC: Multi-version concurrency control, enables reading without locking.
2. Transactional: support for BEGIN, COMMIT and ROLLBACK and recovery on startup.
3. ACID compliant: Atomic, Consistent, Isolated, Durable (once committed changes cannot be lost).
4. Row-level locking: updates use row-level locking allowing for maximum concurrency.
5. Deadlock detection: immediate notification if client processes are deadlocked.
6. Referential Integrity: foreign key support.
7. Write-once: PBXT avoids double-writes by using a log-based architecture.
8. BLOB streaming: In combination with the BLOB Streaming engine.


06年就开始有这么个东西了,始生之物,其形必丑,没错,开始的时候不是很完善,不过经过作者这2,3年的不断改进,
更新,已经有了巨大进步了。

作者的这张和INNODB的测试的性能图可以看得出差别了
作者的测试环境:
MySQL 5.1.30
8 core, 64-bit, Linux machine
with an SSD drive and a 5 warehouse DBT2 database.
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从这个图的表现看出,随着引擎的版本越高,这存储引擎表现越来越好,
例如1.0.08的表现似乎有超越innodb的趋势。
以后要慢慢深入研究一下这个东东了

引擎下载:http://www.primebase.org/download/
快速指南:http://www.primebase.org/download/index.php#qg_source
白皮书: http://www.primebase.org/download/pbxt_white_paper.pdf

参考资料:
http://dev.mysql.com/tech-resources/articles/pbxt-storage-engine.html
http://pbxt.blogspot.com/
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