NAV: SLTechnology News&Howtos > Database >

• 

  How to use the MySQL date addition and subtraction function?

  Today, the editor will bring you an article that introduces the MySQL date addition and subtraction function. The editor thinks it is very practical, so I will share it for you as a reference. Let's follow the editor and have a look. 1. Addtime () is the date plus the specified number of seconds select addtime (no)

  2022-06-01 19:03:39 Views: 237
• 

  Redis self-increment counter

  This article is to share with you the detailed steps of redis self-adding counter production, I believe that most people have not yet learned this skill, in order to let you better understand, to give you a summary of the following, do not say much, let's read on. INCR key increases the number of values stored in key

  2022-06-01 19:03:39 Views: 237
• 

  Online VMS business oracle database user XXX password change

  The steps are as follows: 1. Check which user's proifle is, usually default: command: sql > SELECTusername,PROFILE FROM dba_users;2, view the specified profile (such as default)

  2022-06-01 19:03:39 Views: 210
• 

  Introduction to backup and recovery managed by Oracle users

  Backup or recovery is a top priority in database maintenance. Although the database system runs slowly in many cases, for the loss of database data, it is obvious that the cost of the latter loss is self-evident. The primary task of DBA is to do a good job of data backup as far as possible. 1.1. Physical backup

  2022-06-01 19:03:39 Views: 239
• 

  Installation steps for redis source code and phpredis extension

  Today, the editor will bring you an article that introduces the redis source code and the installation steps of the phpredis extension. The editor thinks it is very practical, so I will share it for you as a reference. Let's follow the editor and have a look. First, we need to download the installation package. Download address: http://do

  2022-06-01 19:03:38 Views: 259
• 

  It is common to convert Oracle to MySql

  1. Type comparison oraclemysqlintintnumber (6) decimal (6) date (sysdate) timestamp (now ()) varchar2 (20) varchar (20)

  2022-06-01 19:03:38 Views: 234
• 

  Count the number of mailboxes in exchange database

  Get-Mailbox-ResultSize unlimited | Group-Object-Property:Database | ft Name,Count

  2022-06-01 19:03:38 Views: 257
• 

  MongoDB permission

  1. Add user MongoDB shell version: 1.8.2connecting to: 127.0.0.1:30000/test > use adminswitched to db a

  2022-06-01 19:03:38 Views: 279
• 

  017-mysql question and answer

  What is the difference between MySql Q & A 1, drop and delete truncate? All three mean to delete, but there are some differences among them: delete and truncate only delete the data of the table, not the structure of the table; drop deletes the whole table;

  2022-06-01 19:03:38 Views: 276
• 

  How to use django-redis in redis

  This article mainly discusses the use of django-redis in redis. There is a certain reference value, friends in need can refer to, follow the editor to see how to use it. Customize connection pooling in the same way as ordinary py files manipulate redis, the code is as follows

  2022-06-01 19:03:22 Views: 223
• 

  How does Redis realize the chat room function?

  Today, the editor will bring you an article that introduces the implementation of chat room functions in Redis. The editor thinks it is very practical, so I will share it for you as a reference. Let's follow the editor and have a look. First, let's introduce a few commands about pub/sub. Post message publish cha

  2022-06-01 19:03:22 Views: 208
• 

  What is the difference between a left link and a right link in MySQL?

  This article mainly discusses the difference between left link and right link in MySQL. There is a certain reference value, friends in need can refer to, follow the editor to see the solution. First, create two new tables with the following data: student table data: score table data: you can see

  2022-06-01 19:03:22 Views: 279
• 

  SQL SEVER installation error: Error Code: 0x80070643 (1603)

  The following error message occurred when installing SQL SERVER 2005: find the files in the directory prompted above: SQLSetup0005_K3_Core.log and SQLSetup0005_K3_Datastore.xml, and open the first

  2022-06-01 19:03:14 Views: 207
• 

  The installation method of Redis on different systems

  This article implements the function redis in windows installation tutorial Redis installation on centos using docker installation Redis implementation environment centos7.3dockerVM virtual machine window installation redis tutorial redis in wi

  2022-06-01 19:02:44 Views: 220
• 

  Three ways to realize batch deletion by redis

  Redis implements batch deletion: 1. Visit the redis root directory cd / usr/local/redis-2.8.192, and log in to redis:redis-cli-h 127.0.0.1-p 6379.

  2022-06-01 19:02:43 Views: 275
• 

  How does Redis count active users with bitmaps?

  First of all, let's take a look at a scenario: a website that needs to count the number of users who have logged in continuously in a week, and the number of users who have logged in in a month. If you use a traditional database such as Mysql to implement, it is difficult to do so. But if you use Redis to do it, it's very simple. Collection type of Redis and B

  2022-06-01 19:02:43 Views: 203
• 

  What is the sharing of databases?

  A database is a warehouse that organizes, stores and manages data according to the data structure. It is a collection of organized, shareable and uniformly managed large amounts of data stored in a computer for a long time. The database is stored together in a certain way, can be shared with multiple users, with as little redundancy as possible, and

  2022-06-01 19:02:40 Views: 284
• 

  Is NULL the same as NOT NULL in MySQL?

  Earlier, I saw that someone asked PHPHub to migrate the nullable and index in the database file. I believe that many people who have used MySQL for a long time (especially those who pay too much attention to business development), the concept of these two field properties is not very clear, generally there will be the following

  2022-06-01 19:02:36 Views: 248
• 

  What are the advantages and disadvantages of memcached and redis?

  1. What are the benefits of using redis? (1) the speed is fast, because the data is stored in memory, and the advantage similar to HashMap,HashMap is that the time complexity of search and operation is O (1) (2) supports rich data types and string,list.

  2022-06-01 19:02:33 Views: 216
• 

  The difference and usage of mysql shared Lock and exclusive Lock

  Mysql lock mechanism is divided into table-level lock and row-level lock. This article will share with you about the shared lock and exclusive lock in mysql. A shared lock is also known as a read lock, or S lock for short. As the name implies, a shared lock means that multiple transactions can share a lock for the same data and can all access it.

  2022-06-01 19:02:03 Views: 234