when nodejs uses redis, it is necessary to create one client at a time and close it after using it! Or create it only once, keep a persistent connection with one client, each time, and do not close ...
what is the difference between master and slave, sentry and cluster in redis? What are the advantages? What scenarios are suitable for? How to choose in the actual work? ...
after saving the value of redis in Java, the value cannot be fetched. You can save it to redis, but the value of key taken out is null . @Autowired private JedisClient jedisClient; redis redis jedisClient.hset("INDEX_CONTENT", cid+"&qu...
problem description when using Redis AOF rewriting policy, the profile parameters are not consistent with the actual effect. The parameters are as follows: appendonly yes auto-aof-rewrite-percentage 100 auto-aof-rewrite-min-size 1mb theoretical res...
1. The production environment needs to check the memory footprint of the hash object corresponding to a key. execute DEBUG OBJECT key, to get the following information: Value at:0x7f7bec732940 refcount:1 encoding:hashtable serializedlength:8506376 lru...
there is the following code in the invoke method: Get the interception chain for this method. List<Object> chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass); the above method finally calls t...
problem description recently, we need to build a high-speed coupon distribution system. Now the mysql, used in the database has a sub-database and sub-table, but it has a bottleneck on the sending rate, and it is more complex for batch operations (the...
SOSOSOSOSOSOSOSOSOSOS urgent I cleared key on the client side using flushdb and flushall had no effect had no effect before it suddenly had no effect, then it had no effect after flushdb redis ...
for example, iphone rewards are given if the judgment key does not exist, and the key is set immediately after the code is entered, so that multiple users will not all get the prize. I wonder whether the concurrency is high enough or there is a probabili...
redis serves as the cache for the database, but redis does not support sql queries? How to solve? ...
after I downloaded the redis, configuration in docker, I used the redis-cli command to report an error Could not connect to Redis at 127.0.0.1 Could not connect to Redis at 6379 < H2 > using docker, for the first time, the following steps are all done ...
< H2 > problem description < H2 > each user s record in the order table of the database has 15 states ( 12 status codes represent on-the-way status, 3 status codes represent final status ). The state between data can be transferred. requires tha...
compared with mq, redis subscription publication has many disadvantages, such as no guarantee that messages must be reached. however, redis subscription publications can certainly have their own advantages. For example, redis publish subscriptions can ...
A scenario: prevents users from visiting the website within a short period of time, causing pressure, and rejects requests if the number of requests is greater than 100 within 10 seconds A key is A1, which expires after 10 seconds. During this period...
can redis hset set expiration time ...
execute smembers follow43007 >: . 30) 59849 31) (nil) 32) 476 33) 253 . want to delete the 31st this nil try: r-bp12ebfe10b16a04.redis.rds.aliyuncs.com:6379>srem follow43007 nil (integer) 0 r-bp12ebfe10b16a04.redis.rds.aliyuncs.com:6379>sr...
I am currently using redis for message queuing. Because it takes a long time to perform some tasks, a server restart may cause queue consumption to fail. for example, the process to be performed is as follows: 1. Queue pop-up task 2. Put the task in...
recently, we have developed a session sharing program based on spring-session, which is based on redis and database storage session,. When redis crashes, sqlserver database storage session is enabled. Later, the leader said that customers may disable coo...
run redis-dump on a book developed according to python3 web crawler, as follows: C:Userswjh > gem install redis-dump Successfully installed redis-dump-0.4.0 Parsing documentation for redis-dump-0.4.0 Done installing documentation for redis-dump afte...
I am working on a multiplayer online authentication module based on AOP and token (because there is no spring security)), which implements login and logout functions. my idea is this: when a user logs in, a token is generated and put into the cache, an...
for a project built with ssm framework and dbcp used to connect to the pool, it is always slow to connect to the database for the first time after starting the project. I found it on the Internet, saying that skip-name-resolve was added to my.cnf and tha...
before, wamp can be installed and used normally. Some time ago, after the system was updated, it could not be used normally, localhost could not be accessed, and Baidu tried to change the port, but it was still useless. Uninstall and reinstall today. Th...
now I want to spoil session=request.session () when changing pages for i in range (0Pie20): session=request.session how to write this format in scrapy? ...
the project is written in Vue. Now there is a requirement that I use the video tag to write that when I am a browser writing a project, it can be played automatically through js code, but it cannot be played automatically after the Android side is packa...
Go programs compiled under Mac are uploaded to two linux servers, one of which runs normally, but the other displays a segment error. what may be the reason? Linux version 2.6.32-573.22.1.el6.x86_64 can run Linux version 3.10.0-514.26.2.el7.x86_64 ...