Database sharding and table partitioning rules
##Sub database and sub table Taken from: http://rdc.taobao.com/team/jm/archives/590 There are usually several goals: Data discreteness, data dis...
Websphere performance tuning
JVM Heapsize -Xms -Xmx 2. When will GC collect Heap Fragmentation 3 Web Container ThreadPool Buffer Timeout Keep-ali...
Websphere trivia
Use the Websphere product installation information command ‘updateInfo’ to search for and view the product properties file./properties/v...
Common sorting algorithms in Java
Taken from< http://deng5566.iteye.com/blog/678817 >For self-study only. Sorting Algorithm Review (Java Implementation) (1): Insertion, Bubbli...
Interesting Java classes
WeakHashMap Function: When accessing this map, all entries will be checked. If a key is not reachable (a concept in GC), the entry will be purged...
Database Table Design
Q: How to minimize the impact of modifying table structures on existing programs in the later stages of development Table design is to reserve a f...
Date in Java
The following two are at the same time: UTC, Coordinated Universal Time (UTC)， use time zone of GMT GMT, Greenwich Mean Time Standard Time 18:00 G...
Javascript Notes
Regular expressions 1234//删除开头和结尾所有的空格 function trim(str) { return str.replace(/(^\s+|\s+$)/g,''); } 1234567注： ^ 开头 $ 结尾 ...
Database Design
Sharding(Shared Nothing), A way to achieve scale out. Its main purpose is to break through the I/O capability limitations of single node data...
excel 功能
excel中功能很丰富，掌握了对程序员帮助很大。 基本的有 Filter功能。记得以前给一个老外发excel报表，他说漏掉了一些。我百思不得其解，明明都包括了啊。最后发现是filter功能过滤了，他没有注意到。这是一个题外话。 新公司有个牛人excel应用得很溜。最近学了一招 VL...