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Vsphere 6 集群上 安装 oracle rac 遇到的共享磁盘故障 - 数据库(内核) - ...
...。但是 oracle 启动不了。
分析
经过3天的测试，找问题，依然没有完全解决问题， 从三天的测试结果来看 无非是 SCSI 总线， SCSI 共享总线，和 磁盘锁定，多点写入参数的组合
实验结果如下
SCSI 总线
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Linux日志管理Rsyslog入门 - C/C++ - 清泛网移动版 - 专注C/C++及内核技术
...性能上更为出色，至于孰优孰劣是个仁者见仁智者见智的问题，鉴于多数Linux发行版均选择了Rsyslog，姑且让我随波逐流一次。
如果说Rsyslog有哪些缺点的话，那么兼容性无疑是很显眼的一个，不同版本之间的差异比较大，使用时...
Comparison of full text search engine - Lucene, Sphinx, Postgresql, MySQL?
... the indexer process uses too.
Scalability is where my knowledge is more sketchy - but it's easy enough to copy index files to multiple machines and run several searchd daemons. The general impression I get from others though is that it's pretty damn good under high load, so scaling it out across mu...
SQL Server Management Studio, how to get execution time down to milliseconds
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Then you get a new tab which records the timings, IO data and rowcounts etc for (up to) the last 10 exections (plus averages!):
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What's the difference between compiled and interpreted language?
...g machine's machine code. So how's that different from a VM (python or JVM etc.) doing the same in case of an interpreted language?
– qre0ct
Jun 23 at 10:28
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Timer function to provide time in nano seconds using C++
...u are measuring code involving sleep, mutex lock, condition_variable wait, etc, the rdtsc clock is likely to have inaccurate conversions to other units. It is a good idea to set your measurements up so that you can easily change and compare clocks (as shown in this answer).
– ...
Is a LINQ statement faster than a 'foreach' loop?
...cts generally is going to add some marginal overheads (multiple iterators, etc). It still has to do the loops, and has delegate invokes, and will generally have to do some extra dereferencing to get at captured variables etc. In most code this will be virtually undetectable, and more than afforded b...
服务器保持大量TIME_WAIT和CLOSE_WAIT的解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的处理方法混为一谈，以为优化系统内核参数就可以解决问题，其实是不恰当的，优化系统内核参 数解决TIME_WAIT可能很容易，但是应对CLOSE_WAIT的情况还是需要从程序本身出发。现在来分别说说这两种情况的处理方法：
1.服务...
SQL SELECT speed int vs varchar
...ver see it. Depending upon CPU, implementation (client/server, web/script, etc) you probably will not see it until you hit few hundred comparisons on the DB server (maybe even a couple thousand comparisons before it is noticeable).
To void the incorrect dispute about hash comparisons. Most hashing...
What exactly are “spin-locks”?
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When you use regular locks (mutexes, critical sections etc), operating system puts your thread in the WAIT state and preempts it by scheduling other threads on the same core. This has a performance penalty if the wait time is really short, because your thread now has to wait for ...