月度归档： 2016年12月

Q:How can I figure out what I really want to do with my life after college?

毕业后，如何才能知道自己真正想做什么？
So I graduated from college a few month ago and landed a job in software development… it's not bad, it coincided with my computer engineering degree, and so that was good to get a job right out of college….

But Idk, it just seems like it's not something I want to do for the rest of my life….. I mean it's not like slavery or anything, but I just don't find it thrilling anymore…. I mean I used to code for fun and do pure mathematics for fun by myself…. I guess coding 8 hours straight a day really sucks it out of you.

Recently I've been looking at other fields, like psychology, sociology, leadership, education, or politics (more notably the life-path of Barack Obama as inspiration), not really in the commercial aspects of things for material gain or "ooo look at me I make 100k/year".

Ik I'm in my early twenties and all…. but I'm just feeling like after I graduated, I feel like I'm doing something that I might not wanna do anymore, but I really don't know what to do anymore with my life. It's definitely not the long-commute 9-5 in a cubicle, but it seems like college prepped me for a life track thats hard to get off after getting a degree, and I don't know where to start to reconcile this.

Any answers/advice (for me or for others wanting similar answers to similar problems) is greatly appreciated.

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The Secret to Finding the Passion in Your Life and Career 如何在生活和工作中拥有干劲

Answer by Oliver Emberton。

Rule 1: Passion comes from success 干劲来源于成功

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java学习笔记（2） java内存和GC

背景知识

Java GC（Garbage Collection，垃圾收集，垃圾回收）机制：
1. 确定哪些内存需要回收，确定什么时候需要执行GC，如何执行GC。
2. 该机制对JVM（Java Virtual Machine）中的内存进行标记，并确定哪些内存需要回收，根据一定的回收策略，自动的回收内存，永不停息（Nerver Stop）的保证JVM中的内存空间，防止出现内存泄露和溢出问题。

关于JVM，需要说明一下的是，目前使用最多的Sun公司的JDK中，自从1999年的JDK1.2开始直至现在仍在广泛使用的JDK6，其中默认的虚拟机都是HotSpot。2009年，Oracle收购Sun，加上之前收购的EBA公司，Oracle拥有3大虚拟机中的两个：JRockit和HotSpot，Oracle也表明了想要整合两大虚拟机的意图，但是目前在新发布的JDK7中，默认的虚拟机仍然是HotSpot，因此本文中默认介绍的虚拟机都是HotSpot，相关机制也主要是指HotSpot的GC机制。

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（转）搜索引擎索引数据结构和算法

原文链接

最近一直在研究Sphinx的工作机制，在［搜索引擎］Sphinx的介绍和原理探索简单地介绍了其工作原理之后，还有很多问题没有弄懂，比如底层的数据结构和算法，于是更进一步地从数据结构层面了解其工作原理。在网上搜了很多资料，发现没有很多介绍这方面的文章，后来找到了一本书，《这就是搜索引擎》，拜读了本书的第三章，介绍了主流搜索引擎用的数据结构及其工作原理，sphinx使用的数据结构也是一样的，用的也是倒排索引。

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oracle释放锁操作

  1. 释放锁表

    • 查看锁表进程SQL语句1： 
    select sess.sid, 
   sess.serial#, 
   lo.oracle_username, 
   lo.os_user_name, 
   ao.object_name, 
   lo.locked_mode 
   from v$locked_object lo, 
   dba_objects ao, 
   v$session sess 
where ao.object_id = lo.object_id and lo.session_id = sess.sid;
    • 查看锁表进程SQL语句2： 
    select * from v$session t1, v$locked_object t2 where t1.sid = t2.SESSION_ID;
    • 杀掉锁表进程：
      如有記錄則表示有lock，記錄下SID和serial# ，將記錄的ID替換下面的738,1429，即可解除LOCK
      alter system kill session '738,1429';