Clearing Your DNS Cache

本文介绍如何通过清除Windows和Mac操作系统的DNS缓存来解决网页加载时出现的404错误。当DNS缓存中的信息过期或不准确时,可能会导致无法访问网站的问题。
Clearing Your DNS Cache - 临沂帆动网络公司 - 网站建设公司|网站排名优化
 
Your DNS cache stores the locations (IP addresses) of pages you have recently viewed. If the location of the page changes before the entry in your DNS cache is updated, you will be unable to access the page.

If you are encountering a high number of HTML 404 error codes, you may need to flush your DNS cache. Once you clear your DNS cache, your computer will query nameservers for the new DNS information you require.

For more information about the HTML 404 error code, please visit the HTML 404 wikipedia article.

The methods detailed below allow you to remove old and inaccurate DNS information that may result in 404 errors.

Windows? XP, 2000, or Vista?

  1. Open the Start menu.
  2. Go to Run.
    • If you do not see the Run command in Vista, search for "run" in the Search bar.
  3. In the Run text box, type: ipconfig /flushdns
  4. Press Enter or Return, and your cache will be flushed.

MacOS?

  1. Go to Applications.
  2. Go to Utilities.
  3. Open the Terminal application.
  4. Type: dscacheutil -flushcache
  5. Press Enter or Return, and your cache will be flushed.
提供的引用内容中未涉及cache monitors和drop caches的相关信息,下面基于常见知识进行介绍。 ### Cache Monitors Cache monitors are tools or mechanisms used to observe and analyze the behavior of a cache system. They provide insights into how the cache is performing, such as hit rates, miss rates, and cache utilization. **Function**: - **Hit/Miss Rate Monitoring**: By tracking the number of cache hits (when data is found in the cache) and cache misses (when data is not in the cache), administrators can evaluate the efficiency of the cache. A high hit rate indicates that the cache is effectively storing frequently accessed data, reducing the need to access slower storage. - **Capacity Utilization**: Monitoring the amount of cache space used helps in determining if the cache is oversized or undersized. If the cache is constantly full, it may lead to more frequent evictions of data, potentially increasing cache misses. **Usage Example in Linux**: In Linux systems, tools like `vmstat` and `sar` can be used to monitor cache - related activities at a system - level. For example, the `vmstat` command can show information about the amount of memory used for caching. ```bash vmstat 1 ``` This command will display system statistics every second, including information about the cache memory usage. ### Drop Caches Dropping caches refers to the process of clearing the data stored in the cache. This can be useful in certain scenarios, such as when you want to measure the performance of an application without the influence of cached data, or when the cache has become stale. **Function**: - **Performance Measurement**: By dropping the cache, you can get a more accurate measurement of the application's performance when accessing data from the underlying storage, as it eliminates the advantage of cached data. - **Clearing Stale Data**: If the data in the cache is no longer valid or relevant, dropping the cache ensures that fresh data will be fetched on the next access. **Usage Example in Linux**: In Linux, you can drop the page cache, dentries, and inodes by writing specific values to the `/proc/sys/vm/drop_caches` file. ```bash # Drop page cache sudo sh -c 'echo 1 > /proc/sys/vm/drop_caches' # Drop dentries and inodes sudo sh -c 'echo 2 > /proc/sys/vm/drop_caches' # Drop page cache, dentries, and inodes sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' ```
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