Http://zeroq.me/p/279
I. cache penetration
When cache is used in projects, the app first checks whether the cache exists. If cache content exists, the app directly queries the database and then caches the query result and returns it. At this time, if a piece of data we query does not exist in the
Reference article: Cache penetration, Cache breakdown, Cache avalanche concepts and solutions I. Cache Breakdown 1. ConceptCache breakdown refers to a high concurrency situation in the cache when the resource does not exist , causing the
HTML config no-cache (memo)No-cache ConfigurationThe HTML table header is as follows
Meta http-equiv= "content-type" content= "text/html; Charset=utf-8 " />
Meta http-equiv= "pragma" content="No-cache">
Meta http-equiv= "cache-control" content="No-ca
Cache breakdown
Definition: the cache key generally has an expiration time. If a key expires, when a large number of concurrent requests access this key, all these requests will reach the DB, this results in a high load on the database in an instant.
Solution: 1. Set mutex and mutex. When the cache is invalid, access the database immediately from time to time, bu
Cache invalidation :The main factor that causes this is high concurrency, we generally set a cache expiration time, there may be some will set 5 minutes ah, 10 minutes of these; High concurrency may occur at a time when a lot of cache is generated, and the expiry time at the same time, this time can be raised-when the expiration time , these caches are invalidate
1, first for the local memory cache, is to cache the data in the native memory, as shown in 1:2, distributed cache mechanism: There may be cross-process, access to cache data across domainsFor distributed caches, because the cached data is placed in the cache server, or, at
First, cache penetration
Our use of caching in projects is usually the app that checks for the existence of the cache, and if there is a direct return of cached content, query the database directly if it does not exist and then cache the query results back. This time if we query a certain data in the cache does not ex
Code
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Httpcontext. cache, httpruntime. cache. There is no difference in usage, that is, the scope of use is different.Httpcontext. cache is context-based and can be used for the same user. If an access is changed, the cache
Ios obtains the cache file size and clears the cache. ios obtains the cache size.
Mobile applications generally perform offline cache processing when processing network resources. The image cache is the most typical one. The popular offline
A brief introduction of cache preheating mechanism in EhcacheEhcache does not immediately load the data on disk into memory when the program is started, but loads it when the data is used (lazy load). Therefore, there is no data inside the cache when it is started. What should we do if we want to use these data before they are all loaded into memory?Ehcache provides a bootstrapcacheloader mechanism to solve
Cache with smaller granularity-"Partial View cache" and View cacheIntroduction
I learned a bit about cache, including controller cache and page cache. I also saw an article about some View cache content. Here are some of my learni
1. What is a cache?Caching is an example of a space-time change that exists everywhere. By using extra space, we are able to get faster speeds.First, look at how the user's browser interacts with the server when no Web site is connected to the CDN:When users browse the website, the browser can save a copy of the pictures or other files in the site locally, so that when the user visits the site again, the browser will not have to download all the files
Internet applications often need to cope with large concurrency, and in order to improve QPS, the central cache (such as memcache) and local caching are typically used. The request passes through the local cache first, and if it does not, the request penetrates into the central cache and, if not, queries the database directly and flushes the queried data to the c
First, requirement: 1. Hibernate's second-level cache 2. Independent Business cache 3. Support for region, support for keySet, containsKey, and region traversal first, read the famous memcached and the client spymemcached. Failed. First of all, region is not supported, and various wheels are made by adding prefixes to keys. KeySet, containsKey, and traversal are not supported. So Pass. Then I saw the ehcach
Android development: calculates the cache size and clears the cache. android Cache
The project encountered the function of calculating the cache size and clearing the cache. This is a common function, which is available in almost every APP. I thought the implementation was s
In fact, any information inside any knowledge point is irrelevant, is not important, the important thing is to learn the method, the process of self-exploration (wrong place welcome correct)Summary:HTTP://WWW.CNBLOGS.COM/DUNITIAN/P/4822808.HTML#MVCThis chapter demo: HTTPS://GITHUB.COM/DUNITIAN/LOTCODEBASE/BLOB/MASTER/NETCODE/6. Web Base/bmvc5/mvc5base/controllers/ CacheController.csThis time to relax, let's not always say safety-related things. Cache
For example:
I now have an array of
Array
'10000_20000'=>'上海', '20001_30200'=>'北京', '30201_30300'=>'天津', '30301_40000'=>'深圳'
)Now, I'm going to put each value in the array into the Redis cache, the cache key value can be the array key value after any processing, then I pass in a value of 38000, I want to find in the cache key value contains 38000 of the
Cache penetration ConceptAccess to a nonexistent key, the cache does not work, the request will penetrate into the DB, when the traffic is large, the db will be hung off.Solution SolutionsUsing the bitmap filter, a large enough to store the key that may be accessed, the nonexistent key is filtered directly;Access key does not query the value in db, also writes null values to the
Internet applications often need to cope with large concurrency, and in order to improve QPS, the central cache (such as memcache) and local caching are typically used. The request passes through the local cache first, and if it does not, the request penetrates into the central cache and, if not, queries the database directly and flushes the queried data to the c
Introduction: cache manager plug-in
ASP. NET is a plug-in used to view the cache of the Asp.net site. It can help us effectively monitor the cache status of the system for optimization and easy installation. You only need to introduce a DLL on the page.
Code You only need to add an httphandlers in Web. config.
Function:
1. Clear all applications
Program
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