caching

问题 I'm looking for a way to refresh feed caches in the background. To demonstrate the issue I'm facing with, the below code would help. It renews the cache in every 30 seconds when the page is accessed and loaded. Since it has lots of urls to fetch at once, it gets really slow when the cache needs to be rebuild. $urls = array( 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&output=rss', 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&topic=w&output=rss', 'http://news.google.com/news

问题 I'm looking for a way to refresh feed caches in the background. To demonstrate the issue I'm facing with, the below code would help. It renews the cache in every 30 seconds when the page is accessed and loaded. Since it has lots of urls to fetch at once, it gets really slow when the cache needs to be rebuild. $urls = array( 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&output=rss', 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&topic=w&output=rss', 'http://news.google.com/news

问题 I'm looking for a way to refresh feed caches in the background. To demonstrate the issue I'm facing with, the below code would help. It renews the cache in every 30 seconds when the page is accessed and loaded. Since it has lots of urls to fetch at once, it gets really slow when the cache needs to be rebuild. $urls = array( 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&output=rss', 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&topic=w&output=rss', 'http://news.google.com/news

问题 I currently have a web application which on each page request gets user data out of a database, for the currently logged in user. This web application could have approximately 30 thousands concurrent users. My question is would it be best to cache this. For example in C# using System.Web.HttpRuntime.Cache.Add or would this cripple the servers memory storing up to 30 thousand user objects in the memory? Would it be better to not cache and just get the required data from the database on each

问题 I currently have a web application which on each page request gets user data out of a database, for the currently logged in user. This web application could have approximately 30 thousands concurrent users. My question is would it be best to cache this. For example in C# using System.Web.HttpRuntime.Cache.Add or would this cripple the servers memory storing up to 30 thousand user objects in the memory? Would it be better to not cache and just get the required data from the database on each

问题 I have a class method which fetches images with a completion block. This fetched UIImage is added to an NSCache with a relevant key. This seems to work as expected, however, in the method which fetches images I am using a UIImage 's imageWithData: method, which I have discovered does not cache it's data, only imageNamed: does. I am understandably getting memory warnings because of this, how do I make sure the images loaded with UIImage 's imageWithData: method are removed from memory when not

问题 This is a follow up to this question regarding caching responses to an HttpWebRequest . I have a WebApi server that returns a JSON response with an Expires header that indicates how long the response should be cached locally on the client. I have written a .Net Standard 2.0 library with code to enable a default RequestCachePolicy as follows: var policy = new RequestCachePolicy(RequestCacheLevel.Default); HttpWebRequest.DefaultCachePolicy = policy; var request = WebRequest.Create(url); ... etc

问题 This is a follow up to this question regarding caching responses to an HttpWebRequest . I have a WebApi server that returns a JSON response with an Expires header that indicates how long the response should be cached locally on the client. I have written a .Net Standard 2.0 library with code to enable a default RequestCachePolicy as follows: var policy = new RequestCachePolicy(RequestCacheLevel.Default); HttpWebRequest.DefaultCachePolicy = policy; var request = WebRequest.Create(url); ... etc

问题 If SQL is used directly or created by NHibernate, with possibly big "where in / not in ([1 to 100 parameters])" conditions, does it make sense to fill up parameters to certain limits, to have a limited number of query plans? Parameters are int/number, DBMS is MSSQL or Oracle. The queries are called via sp_executesql/executeimmediate to enforce query plan caching. Normally, such a query would have up to 100 query plans for the same query. Several such queries might quickly fill up the cache,

问题 When issuing a statement to MySQL8 server: SELECT SQL_NO_CACHE * FROM <table-name>; I get this warning: Warning, 1681, 'SQL_NO_CACHE' is deprecated and will be removed in a future release. I would like to ask if there is any successor of the SQL_NO_CACHE that works or is planned to work with MySQL 8.x? Does SQL_NO_CACHE actually work with MySQL 8.x or it is omitted by the server? 来源： https://stackoverflow.com/questions/58584596/mysql-8-warning-sql-no-cache-is-deprecated