If mongodb is used as a persistent storage database, is it necessary to use redis for another layer of cache?

If mongodb is used as a persistent storage database, is it necessary to use redis for another layer of cache? ps: I have observed that the mongodb server process takes up more than 1g of memory when running even if the data volume is very small (capacity is more than 1g). Could it be that mongodb it...

滿天的星座 2017-05-16 13:19:03 0  3  1138

javascript - express-session + redis, why do you need session persistence, what are the benefits?

express-session + redis, why do you need session persistence and what are the benefits?

怪我咯 2017-06-22 11:54:28 0  1  1002

mysql cache issue

1. The database mysql, the persistence layer uses mybatis2. Now I have configured two data sources A and B, but two data sources, but in fact the two data sources are configured with the same database 3. Now I write through data source A Enter a record, but it cannot be queried through B. You must w...

巴扎黑 2017-05-24 11:34:40 0  1  741

javascript - How to solve this problem when nidejs environment setting operation keeps happening?

Keep going wrong? Administrator rights issue? But I changed the operation in the D drive directory and it still looks like this.

高洛峰 2017-05-16 13:42:38 0  1  620

MySQL: Permanent solution to "Waiting for table metadata lock" issue

My MySQL database serves three web applications as a storage backend. However, I recently encountered the error "Waiting for table metadata lock" permanently. This happens almost all the time and I don't understand why. mysql>showprocesslist->;+------+-----------+------------------+-...

P粉076987386 2023-10-18 21:53:32 0  1  757

When using the fetch object in PHP, the while loop cannot be used to take effect

I'm making a login page for the admin, but the while loop in the php code is not working. I'll leave the code here (sorry for the Spanish in the code) //Create connection $conn=mysqli_connect($servername,$username,$password,$dbname); //Check connection if(!$conn) {echo "An error occurred while ...

P粉803444331 2023-08-16 11:49:58 0  1  570

MySQL - Simple query sometimes suffers from infinite loop and increasing number of rows_fetched

I've been trying to figure out for the past 4 weeks why queries are executing intermittently forever on DockerMysqlPerconaDistribution (percona:8.0.32-24, empty my.cnf). This postscript query is run after importing multiple CSVs generated using MySQLShell's data mining algorithm. Half of the time, i...

P粉022140576 2023-09-08 09:20:56 0  1  628

SMProxy, a MySQL database connection pool developed by Swoole based on the MySQL protocol.

SMProxySwoole MySQL Proxy is a MySQL database connection pool developed by Swoole based on the MySQL protocol. The principle is to store the database connection as an object in the memory. When the user needs to access the database, the connection will be established for the first time. Later, inste...

子山 2019-01-29 14:50:17 0  0  1374

Is using Alter here an incorrect choice compared to using Cast?

So I created a table with all varchar(255) and then decided to use CAST to change it to UNSIGNED (since all values ​​are positive). When I checked, it had been changed to unsigned. However, I noticed that when I checked the entire table again, the columns were still treated as varchar. My understand...

P粉176203781 2023-09-13 17:14:57 0  1  541

javascript - The state attribute cannot be read using vuex prompt?

I use vuex for state management but I keep getting errors. I don’t know what’s wrong. index.vue {code...} vuex settings (index.js, user.js) index.js {code...} user.js {code... .} main.js {code...}

習慣沉默 2017-05-19 10:37:11 0  1  779

R interface to the Ghost CMS API

I'm trying to connect to a local Ghost CMS instance from R using the built-in Admin API. The documentation (https://ghost.org/docs/admin-api/#token-authentication) on how to connect various languages ​​is good, but unfortunately there is no documentation for R. I have written the following code but ...

P粉134288794 2023-08-03 12:45:37 0  1  588

When calling Spring Boot REST API multiple times using the same JDBC connection

I have a REST web service written in Java/SpringBoot, running on Tomcat9. I need to create a MySQL temporary table in one web service call and access it in another service call. Since the temporary table is connection scoped, I need to use the same connection I used when creating the table in the fi...

P粉769045426 2023-08-27 09:40:00 0  1  592

phpstudy how to set up a remote site

I have compiled a web page locally, and I want to put both the web page and the database on a remote server. I downloaded phpstudy and used Phpstudy mysql tool->parameter value setting->datadir to set the location of the remote database, such as \\\\192.168.1.1\\data, and the server can connec...

张涛 2019-05-07 14:57:57 0  0  1239

I can't log in to the TP5 backend, please give me some advice, thank you.

I downloaded a source code study of thinkphp5.3 from the Internet. Because there is no installation file, it can only be installed through database import. After importing the database and configuring the database connection file, find admin:adminpassword:12eefdf664f0e07e65a2c35e01e98d29 in the admi...

A 2021-11-09 23:07:05 0  5  1118

Why does the domain name resolution of the toolbox always go wrong?

I create a website locally, but the local domain name keeps getting errors. "The source code has been placed in the directory, and the site domain name management is also done." There is an error in parsing the domain name. Is there an error in the hosts file? Where is the hosts file code?...

phpcn_u15133 2017-08-13 23:49:57 0  1  848

Permissions issue

According to the teacher's code, if the system administrator adds all submenus, and the developer cancels the two permissions of the administrator to save and the administrator to add, after testing, these two permissions are still available. According to the code, I only see that the code is only b...

奋斗 2018-12-10 14:14:25 0  0  1206

The verification code in the Thinkphp5 teaching management system keeps prompting an error and cannot be logged in.

SEC 2017-09-06 12:56:45 0  4  1583

java - Is it better to join a traditional company or continue to look for a company that uses mainstream Internet technologies? , this traditional company is offering 6.5k, should we continue looking or accept the offer?

I graduated in June this year and found a company that makes the Guangdong Provincial Civil Service Examination and Recruitment Management System. It is a traditional development company. The technology used is ssh. I have been an intern for almost a year. I resigned last week. I will continue to lo...

漂亮男人 2017-05-27 17:40:59 0  3  763

A pure novice, what tools do I need to use for the following systems?

The description may be very amateurish. I want to make a system for web-based personnel information management. It can import and export data in batches, add, delete, modify and check. The most important points are as follows: 1. The data is mainly the information scanned by the identity scanner, in...

胖达 2018-07-30 10:56:57 0  2  961

Tutorial on the use of PHP's free commonly used express logistics API query interface

The express tracking number query API can be connected to SF express query, postal express query, ZTO express query, etc. These express logistics companies provide express logistics such as automatic identification interfaces for express order numbers and query interfaces for express order numbers. ...

昨日青空 2019-09-10 17:25:29 0  0  1640