mongodb installation and Application

1. Install the database If necessary, update the yum package management first. Take the CentOS system as an example below: $ yum -y update 1. Install Mongodb View the current system version $ cat /etc/redhat-release open https://repo.mongodb.org/yum/... , select the mongo version that suits your system, and then edit the Mongodb installation so ...

Added by Rianna on Wed, 15 May 2019 00:05:10 +0300

Introduction of AspNetCore Limit Middleware

IpRateLimitMiddleware(Github: AspNetCoreRateLimit ) is a stream-limiting middleware for ASPNETCore that controls how often clients invoke APIs. If clients frequently access the server, it can limit its frequency and reduce the pressure of accessing the server.Or if a crawler is crawling critical data, you can limit the number of ca ...

Added by dapuxter on Tue, 14 May 2019 20:08:52 +0300

PostgreSQL 11.1 trillion tpcb performance test on Aliyun ECS + ESSD + zfs/lvm2 strip + block_size=32K

Label PostgreSQL, pgbench, tpcb, tpcc, tpch, lvm2, zfs, bands background Several recent PostgreSQL OLTP and OLAP tests: PostgreSQL 11 tpcc Test (103,000 tpmC on ECS) - use sysbench-tpcc by Percona-Lab (TPC-H test SF=10,SF=200) PostgreSQL 11 vs 10 vs Deepgreen PostgreSQL 10 billion tpcb performance on ECS PostgreSQL on Aliyun ECS + ESSD - 100 ...

Added by stanleycwb on Tue, 14 May 2019 14:43:51 +0300

Nested Query of Cloud Functions in Small Programs

Just using cloud development, I don't know if there are nested query statements in the small program database, so I can only use the most clumsy method to find out the loop and look up again. Okay, next, the question is, have you found out, what kind of value you found? I've been working on this problem for a day. I just starte ...

Added by james_andrews on Tue, 14 May 2019 14:10:23 +0300

Implementation of Mybatis-TypeHandler Based on SpringBook Customization

Demand: Enumerations are used in programs to represent states or options, while numbers are used in databases to store them. The advantage of doing this is that enum is used in the program more intuitively to know the state and meaning of each value. Analysis: EnumTypeHandler and EnumOrdinal TypeHandler are two existing types ...

Added by chomps on Sun, 12 May 2019 14:34:08 +0300

Database System Experiment 4: SQL-SELECT Query Operation

Database System Experiment 4: SQL Language-SELECT Query Operation Database System Experiment 4: SQL Language-SELECT Query Operation Experimental environment Experimental content Steps and processes First create the jxgl database for testing by following SQL statements Use SQL statements to express the following queries ...

Added by nalleyp23 on Sun, 12 May 2019 13:43:12 +0300

Computer room combination query

Combinatorial Query about VB Edition Room Management In the VB version computer room management system, there are many database queries, and also many combination queries. It is a headache to make clear the combination queries when you have just touched the database. Next let me write a simple combination query in my ...

Added by Brendan on Sun, 12 May 2019 09:01:54 +0300

cnpmjc and sinopia build private warehouse

cnpmjc and sinopia build private warehouse Article directory Basic use of nrm install Use npm, cnpm set mirror Installation steps of cnpmjs.org server Clone code Install mysql database Configure config/index Database Configuration Other configurations start-up Verification cnpmjs.org client Release Siopia Builds Private ...

Added by Earnan on Sun, 12 May 2019 09:00:50 +0300