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<!DOCTYPE html>
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<article id="post-oracle-ora00020" class="article article-type-post" itemscope itemprop="blogPost">
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<time datetime="2016-12-27T04:03:57.000Z" itemprop="datePublished">2016-12-27</time>
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<a class="article-title" href="/2016-12-27-oracle-ora00020.html">Oracle无法登陆:ORA-00020</a>
</h1>
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<a href="/2016-12-27-oracle-ora00020.html" class="article-date">
<time datetime="2016-12-27T04:03:57.000Z" itemprop="datePublished">2016-12-27</time>
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<p>转自：<a href="http://blog.itpub.net/22621861/viewspace-1280235/" target="_blank" rel="external">http://blog.itpub.net/22621861/viewspace-1280235/</a></p>
<p>登录Oracle数据库，结果报ORA-00020: maximum number of processes (%s) exceeded错误。</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="operator"><span class="keyword">select</span> username,<span class="keyword">count</span>(sid) <span class="keyword">from</span> v$<span class="keyword">session</span> <span class="keyword">group</span> <span class="keyword">by</span> username;</span></span><br><span class="line">USERNAME COUNT(SID)</span><br><span class="line"><span class="comment">------------------------------ ----------</span></span><br><span class="line"> 21</span><br><span class="line">SYSMAN 124</span><br><span class="line">SYS 1</span><br></pre></td></tr></table></figure>
<p>发现SYSMAN用户有大量会话数，后发现SYSMAN主要用的PROGRAM是OMS。</p>
<p>查阅OMS相关信息，得知其是由Enterprise Management产生的。</p>
<p>关闭EM，CMD下执行:</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">emctl stop dbconsole</span><br></pre></td></tr></table></figure>
<p>确保下次启动默认不启动EM，需要在Windows服务中关闭OracleDBConsoleORCL服务的自动启动。</p>
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<article id="post-dokuwiki-nginx" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016-12-17-dokuwiki-nginx.html">Windows下用Nginx部署DokuWiki</a>
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<time datetime="2016-12-17T12:56:06.000Z" itemprop="datePublished">2016-12-17</time>
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<p><a href="https://www.dokuwiki.org/dokuwiki#">DokuWiki</a> 是一个使用，用途多样的开源 Wiki 软件，并且不需要数据库。部署Dokuwiki需要一个支持PHP的Webserver。通过nginx+php可以简单部署使用。<br><a href="http://nginx.org/en/">Nginx</a> (“engine x”) 是一个高性能的HTTP和反向代理服务器，也是一个IMAP/POP3/SMTP服务器。<br>本文环境：<code>windows10 64位</code>+<code>nginx1.11.7</code>+<code>php-5.6.29-Win32-VC11-x64</code></p>
<h2 id="下载解压软件">下载解压软件</h2><p>用到的软件均是绿色版，不用安装解压即可使用： </p>
<ul>
<li><a href="http://windows.php.net/downloads/releases/php-5.6.29-Win32-VC11-x64.zip">php-5.6.29-Win32-VC11-x64.zip</a> 解压到 <code>E:\OneDrive\www\php</code></li>
<li><a href="http://nginx.org/download/nginx-1.11.7.zip">nginx-1.11.7.zip</a> 解压到 <code>E:\OneDrive\www\nginx-1.11.7</code></li>
<li><a href="https://download.dokuwiki.org/src/dokuwiki/dokuwiki-stable.tgz">DokuWiki</a> 解压到 <code>E:\OneDrive\www\dokuwiki</code></li>
<li><a href="http://redmine.lighttpd.net/attachments/660/RunHiddenConsole.zip">RunHiddenConsole</a>(此程序用于隐藏nginx运行的窗口) 解压到 <code>E:\OneDrive\www\RunHiddenConsole.exe</code></li>
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<article id="post-cloud-notes-2012" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016-12-03-cloud-notes-2012.html">无意翻到当年的云笔记</a>
</h1>
<div class="article-meta">
<a href="/2016-12-03-cloud-notes-2012.html" class="article-date">
<time datetime="2016-12-03T04:03:57.000Z" itemprop="datePublished">2016-12-03</time>
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<p>Create: Sat Nov 24 2012 07:09:37 GMT+0800 (中国标准时间)Link<br>学校举办一次中国象棋比赛，有10名同学参加，比赛采用单循环赛制，每名同学都要与其他9名同学比赛一局。比赛规则，每局棋胜者得2分，负者得0分，平局两人各得1分，比赛结束后，10名同学的得分各不相同，已知：（1）比赛第一名与第二名都是一局都没有输过；（2）前两名的得分总和比第三名多20分；（3）第四名的得分与最后四名的得分和相等。那么，排名第五名的同学的得分是？<br>A.8分 B,9分 C.10分 D.11分</p>
<p>Create: Sat Nov 24 2012 07:09:37 GMT+0800 (中国标准时间)Link<br>年度最爱电影。穆赫兰道影评是两个极端，抛去其他人的看法，自己坚持看完这部冗长的电影，而且还不知所云，只是强迫自己记住其中内容，等看完影评后用记忆串联起整部片子的时候，我深深地呼了一口气。</p>
<p>Create: Sat Nov 24 2012 07:09:37 GMT+0800 (中国标准时间)Link<br>【心理技巧：如何让人喜欢你】1、出门照照镜子，给自己一个自信的微笑；2、善于发现别人优点；3、赞美；4、主动、付出，别陪着人冷场；5、接受别人递过来的零食；6、多请人帮你小忙；7、用心倾听，不打断对方的话；8、说话有力，能感受到自己声音的感染力；9、说话之前，先考虑对方的感觉。</p>
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<a class="article-title" href="/2016-08-18-oracle-auto-backup-and-restore.html">oracle自动备份同步</a>
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<a href="/2016-08-18-oracle-auto-backup-and-restore.html" class="article-date">
<time datetime="2016-08-18T10:41:36.000Z" itemprop="datePublished">2016-08-18</time>
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<p>oracle的简单导入导出工具一般有 <code>exp/imp</code> 跟 <code>expdp/impdp</code>。</p>
<ul>
<li>exp无法导出空表结构</li>
<li>exp可以导出long类型的数据，expdp不可以。long类型现在在慢慢被淘汰中。</li>
<li>exp是客户端工具，expdp是服务器端工具，expdp还可以并发，exp不可以</li>
</ul>
<p>使用exp导出而不是expdp的情况是无法直接访问数据库主机，也无法在建立dblink，这个时候只能使用exp导出。大部分情况还是用 expdp/impdp。exp无法导出空表不注意的话是很麻烦的，曾经做同步就因为这个原因导致应用无法使用，虽然网上也有一些解决办法，但是都需要对源库做一些变更，这对生产服务器来说还是很麻烦的，毕竟操作了就有风险要负责任。下面是用expdp/impdp自动同步生产跟测试库的范例。</p>
<h2 id="环境">环境</h2><p>源库跟目的库的Oracle大版本要一致，并且数据库SID要一样。<br>本文测试环境：</p>
<ul>
<li>源库操作系统 <code>windows server 2008 R2 x64</code><br>源库数据库版本 <code>11g Enterprise Edition Release 11.2.0.1.0 - 64bit</code></li>
<li>目的库操作系统 <code>win7 x64</code> <code>win10 x64</code> <code>windows server 2008 R2 x64</code> 均测试成功<br>目的库数据库版本 <code>11g Enterprise Edition Release 11.2.0.1.0 - 64bit</code></li>
</ul>
<p>查看版本：</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="operator"><span class="keyword">select</span> banner <span class="keyword">from</span> sys.v_$<span class="keyword">version</span>;</span></span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2016-08-06-python-zhengze-pachong-qiubai.html">Python爬虫正则表达式抓取糗百笑话</a>
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<p>很多人对正则表达式很头痛，其实写正则表达式是有套路的，看完这篇文章保证你会写任何html上的内容抓取的正则。<br>为确保代码的正确性，此文约定环境为python3，如果在python2运行，可能要做一些调整。</p>
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<a class="article-title" href="/2016-06-25-ssh-upload-dir-to-linux-vps-by-scp.html">SSH通过SCP命令上传文件夹到linux系统的vps</a>
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<h2 id="环境">环境</h2><p>mingw2.0.3</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">$ scp -P <span class="number">26443</span> -r /E/OneDrive/GitRepository/ItChat_old root@<span class="number">23.105</span>.<span class="number">203</span>.**:~/ItChat</span><br><span class="line">root@<span class="number">23.105</span>.<span class="number">203</span>.**<span class="string">'s password:</span><br><span class="line">config 100% 397 0.4KB/s 00:00</span><br><span class="line">description 100% 73 0.1KB/s 00:00</span><br><span class="line">HEAD 100% 24 0.0KB/s 00:00</span><br><span class="line">applypatch-msg.sample 100% 478 0.5KB/s 00:00</span><br><span class="line">commit-msg.sample 100% 896 0.9KB/s 00:00</span><br><span class="line">post-update.sample 100% 189 0.2KB/s 00:00</span></span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2016-05-31-python-excel.html">Python调用dll动态链接库操作excel</a>
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<p>这是一篇Python调用动态链接库的标准示范。</p>
<h2 id="原理">原理</h2><p>其实不管什么语言调用dll的流程都是一样的：先注册dll到操作系统，然后获取到初始化的dll对象，然后就可以调用dll的各种api接口了。</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">register</span><span class="params">()</span>:</span></span><br><span class="line"> <span class="string">'''注册插件</span><br><span class="line"> '''</span></span><br><span class="line"> pythoncom.CoInitialize()</span><br><span class="line"> command = <span class="string">"regsvr32 /s atl.dll"</span></span><br><span class="line"> os.system(command)</span><br><span class="line"> <span class="keyword">try</span>:</span><br><span class="line"> lx = win32com.client.Dispatch(<span class="string">'Lazy.LxjExcel'</span>)</span><br><span class="line"> <span class="keyword">except</span> pywintypes.com_error:</span><br><span class="line"> command = <span class="string">'regsvr32 /s LazyOffice.dll'</span></span><br><span class="line"> <span class="keyword">if</span> os.system(command) == <span class="number">0</span>:</span><br><span class="line"> lx = win32com.client.Dispatch(<span class="string">'Lazy.LxjExcel'</span>)</span><br><span class="line"> <span class="keyword">return</span> lx</span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> self.log.error(<span class="string">'regsver32 error'</span>)</span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> <span class="keyword">return</span> lx</span><br></pre></td></tr></table></figure>
<p>这段代码是python调用dll的标准代码。别的dll也可以用这个调用。其中<code>LazyOffice.dll</code>是操作excel的dll文件，<code>Lazy.LxjExcel</code>是初始化的操作excel的对象，该对象由dll的编写作者提供。</p>
<p>然后就能通过返回的lx调用这个dll内部封装的接口啦：<code>lx.ExcelOpen(path, visual)</code></p>
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<p>python自带的记录日志模块 <a href="https://docs.python.org/3/library/logging.html#module-logging">logging</a> 非常强大，但是每次写程序都要写很多东西来配置使用，体验不怎么友好，花时间封装在一个文件里面，用的时候直接调用，并且提供配置接口保留其强大的功能还是非常有必要的。</p>
<h2 id="logging介绍">logging介绍</h2><p>Python的logging模块提供了通用的日志系统，可以方便第三方模块或者是应用使用。这个模块提供不同的日志级别，并可以采用不同的方式记录日志，比如文件，HTTP GET/POST，SMTP，Socket等，甚至可以自己实现具体的日志记录方式。</p>
<p>logging模块与log4j的机制是一样的，只是具体的实现细节不同。模块提供logger，handler，filter，formatter。</p>
<ul>
<li>logger：提供日志接口，供应用代码使用。</li>
<li>handler：将日志记录（log record）发送到合适的目的地（destination），比如文件，socket，cmd等。一个logger对象可以通过addHandler方法添加0到多个handler，每个handler又可以定义不同日志级别，以实现日志分级过滤显示。每个handler还可以单独设置自己的formatter格式。</li>
<li>filter：提供一种优雅的方式决定一个日志记录是否发送到handler。</li>
<li>formatter：指定日志记录输出的具体格式。</li>
</ul>
<p>与log4j类似，logger，handler和日志消息的调用可以有具体的日志级别（Level），只有在日志消息的级别大于logger和handler的级别才会呈现。</p>
<p>默认的日志级别设置为<code>WARNING</code>（日志级别等级<code>CRITICAL</code> > <code>ERROR</code> > <code>WARNING</code> > <code>INFO</code> > <code>DEBUG</code> > <code>NOTSET</code>）, 小于WARNING级别的日志都不输出, 大于等于WARNING级别的日志都会输出。<br>
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<a class="article-title" href="/2016-05-25-oracle-rebuild-temp-tablespace.html">Oracle收缩临时表空间</a>
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<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">SQL> alter tablespace temp shrink space;</span><br><span class="line">表空间已更改。</span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2016-05-21-oracle-cold-backup.html">Oracle冷备与恢复</a>
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<p>冷备恢复是oracle最快捷方便安全的恢复、拷贝方式。他只有一个缺点：冷备的时候要关闭源库。冷备特别适合搭建跟生产一致的测试环境。</p>
<h2 id="环境">环境</h2><p>源库跟目的库的Oracle大版本要一致，并且数据库SID要一样。<br>本文测试环境：</p>
<ul>
<li>源库操作系统 <code>windows server 2008 R2 x64</code><br>源库数据库版本 <code>11g Enterprise Edition Release 11.2.0.1.0 - 64bit</code></li>
<li>目的库操作系统 <code>win7 x64</code> <code>win10 x64</code> <code>windows server 2008 R2 x64</code> 均测试成功<br>目的库数据库版本 <code>11g Enterprise Edition Release 11.2.0.1.0 - 64bit</code></li>
</ul>
<p>查看版本：</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="operator"><span class="keyword">select</span> banner <span class="keyword">from</span> sys.v_$<span class="keyword">version</span>;</span></span><br></pre></td></tr></table></figure>
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