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How to correctly use redis queue to deal with php second kill concurrency problem?
Baidu found this way of thinking: needs a queue, a queue of panic buying results and a queue of inventory. In the case of high concurrency, first put the user into the queue, use a thread loop to remove a user from the queue, and judge whether the user...
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How to realize the operation of buying tickets in cinemas to prevent the phenomenon of buying more than one ticket?
recently, a project is a theater ticket management system, but the ticket module does not know how to implement it. At first, it uses the transaction and locking mechanism of MySQL database, but there are still some problems. Finally, I think about wheth...
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Why can't Redis execute the process, can only insert the queue, but not execute? Is there any way to rule it out?
1. There is no problem with testing the code locally 2. When you turn on php think queue:listen on the server, there is no response or error message, as if nothing has been moved. 3. However, you can insert a new task queue, but do not execute to the s...
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Redis geo latitude and longitude calculation records, why the closer the latitude and longitude, the greater the distance?
the idea is that I first record several different points in redis, and then take a point as the center, get the points with a square circle, such as 500m, and sort them by distance, but find that the closer the longitude and latitude, the greater the dis...
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CentOS7 PHP7.2.2 installs redis extension error
1. Problem description
gitphp-redis:git clone https: github.com edtechd phpredis.git
extension=redis.so php.ini
php-fpm:
`[27-Apr-2018 08:19:57 UTC] PHP Warning: PHP Startup: Unable to load dynamic library redis.so (tried: usr lib64 php modules...
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How to design an online seat selection system which can change seat information dynamically?
such as now I want to design an online seat selection system but when users sign up, they can dynamically edit unreserved seats in the background how should I design it from the generation of seats to the final registration, seat selection and editing...
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Tencent QQ Game user points how to do?
Tencent s qq generally consumes points when fighting landlords. His qq coins are usually stored in memory. in addition, he also has recharged qq coins, if stored in memory, how to ensure that after each successful recharge, the currency of memory will ...
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Troubleshooting problems with high redis cpu occupancy
the occupation of an online redis CPU is relatively high. How to troubleshoot this? redis users provide PHP scripts to obtain data, and PHP processes data ...
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Class library for PHP redis persistent connections
is there a persistent connection for PHP and a redis class library with reconnection function? ...
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Php message queuing php-resque registration listening event problem
how to add more listening files to listen to different job states when I have multiple job Resque_Event::listen ( eventName , [callback]); ...
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How does redis search for field values?
the data is designed as follows:
assume that the user information is stored below,
127.0.0.1:6379> HMSET user:1 username age 11 status 1
OK
127.0.0.1:6379> HMSET user:2 username age 12 status 0
OK
127.0.0.1:6379> HMSET user:3 username age...
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After the development environment installs php-redis.dll, why can you use redis?
1. Why can redis? be used after php-redis.dll is installed in the development environment is this redis the client? 2. What is the role of the redis server in the online environment? Manage redis data or something? 3. This question has been searched o...
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Redis calls the API in js to count and incr twice each time.
the value taken out each time is 2. Why but the fiddler grab package also shows that it was only called once. There is no record of two calls. this happens only in js, but not if you open the interface address in the browser. ...
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About using PHP to make a dividend plan in the early hours of every day.
1. Number of users: about 5w 2. Business requirements:
5
3. Problems encountered:
mysql
redis
...
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After the installation of redis4.0, the memory continues to rise, how to safely clear the memory?
php adds redis cache to the page, and it has a life cycle. It has been used for a month and found that the memory is almost full. How to deal with it? What is the impact of clearing memory directly? What s the safest thing to do? Thank you! ...
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Can redis hset set the expiration time?
can redis hset set expiration time ...
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Php operation redis when operating an ordered set, withscores plus true results in a null value
$redis->flushAll();
set
1.
$redis->zAdd( stud ,11, zhangsan ,22, zhangsan1 ,33, zhangsan3 );
$redis->zAdd( stud ,66, zhangsan2 ,55, zhangsan6 ,44, zhangsan5 );
2.
...
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What command does php use to connect to a redis cluster?
$obj_cluster = new RedisCluster(NULL, [ 192.168.222.130:6379 ]);
...
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I have three ideas for API requests for external interfaces with frequency restrictions, for guidance.
suppose that the order is confirmed and then pushed to the remote server, and the API limits it to 70 times per minute. It thinks of the following solutions:
1. Each click will request an API, wait for the result to return and verify the result. Probl...
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Php uses redis subscription, how to return data in real time on the subscribe front-end page of web execution?
I have read some redis subscription articles that talk about using subscriptions in the command exercise. Are those real-time message notifications implemented by Ajax polling? Since subscribe monopolizes the connection blocking mode, it must no longer b...
