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简洁明晰的讲述互联网的协议 阅读全文
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As I've said in a few talks, the best way to improve your systems is by first not doing "dumb things". I don't mean you or your development staff is "dumb", it's easy to overlook the implications of these types of decisions and not realize how bad they are for maintainability let alone scaling. As a consultant I see this stuff all of the time and I have yet to ever see it work out well for anyone. 阅读全文
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PostgreSQL表空间、模式、表、用户/角色之间的关系是本文我们主要要介绍的内容，表空间，数据库，模式，表，用户，角色之间的关系到底是怎样的呢？ 阅读全文
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ingletons are objects that only support one instance of the object. In ArcObjects, singleton objects require instantiation through the Activator class and require explicit release via the ComReleaser class. See the System._ComObject and casting to strongly typed RCWs and Releasing COM References documents for more information. Additionally, all ArcObjects references within a thread should only communicate with objects in the same thread. Therefore, at ArcGIS 9.x, singleton objects were designed 阅读全文
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postgresql系统表~小记 阅读全文
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PostgreSQL 的昨天今天和明天 阅读全文