大约有 42,000 项符合查询结果（耗时：0.0599秒） [XML]
实战低成本服务器搭建千万级数据采集系统 - 更多技术 - 清泛网 - 专注C/C++...
...法。由于有两个表作为数据插入表，使用数据库表的自增id并不太合适，需要一个高速的唯一自增Id服务器提供生成分布式ID。另数据库完全可以关闭写事务日志 ，提高性能，因为抓取的数据当时丢失再启动抓取就可以了， 这样...
How does MongoDB sort records when no sort order is specified?
... for storage engines and MongoDB's API does not mandate predictability outside of an explicit sort() or the special case of fixed-sized capped collections which have associated usage restrictions. For typical workloads it is desirable for the storage engine to try to reuse available preallocated spa...
How to step back in Eclipse debugger?
... but for some cases it can really save a lot of time.
Update: Chronon provides a commercial product that it describes as a "DVR for Java", which appears to do a lot of the same things as the ODB.
share
|
...
Ignoring a class property in Entity Framework 4.1 Code First
...clude a particular property
public class Customer
{
public int CustomerID { set; get; }
public string FirstName { set; get; }
public string LastName{ set; get; }
[NotMapped]
public int Age { set; get; }
}
[NotMapped] attribute is included in the System.ComponentModel.DataAnnot...
Debugging iframes with Chrome developer tools
...ole to look at variables and DOM elements in my app, but the app exists inside an iframe (since it's an OpenSocial app).
...
Accessing items in an collections.OrderedDict by index
...
If you only access one item, you can avoid the memory overhead of list(d.items()) by using next(islice(d.items(), 1)) to get ('bar', 'spam')
– Quantum7
Oct 20 '17 at 15:37
...
Check if pull needed in Git
... pull", and the other two as "don't need to pull".
You can get the commit id of any ref using git rev-parse <ref>, so you can do this for master and origin/master and compare them. If they're equal, the branches are the same. If they're unequal, you want to know which is ahead of the other. U...
How to simulate a mouse click using JavaScript?
...celable: true
}
You can use it like this:
simulate(document.getElementById("btn"), "click");
Note that as a third parameter you can pass in 'options'. The options you don't specify are taken from the defaultOptions (see bottom of the script). So if you for example want to specify mouse coordina...
What does git rev-parse do?
...that I've used for:
--verify to verify that the specified object is a valid git object.
--git-dir for displaying the abs/relative path of the the .git directory.
Checking if you're currently within a repository using --is-inside-git-dir or within a work-tree using --is-inside-work-tree
Checking if...
What are file descriptors, explained in simple terms?
...e maintained, where first one is per-process and the second one is system wide. FD in per-process table (i.e fdtable) is not unique system wide. However it maps to v-node table that contains the system wide unique entries. So when you call fopen() and fileno() function to check the descriptor then y...