Detailed description of four transaction isolation levels of MySQL and four levels of mysql
Test environment of this experiment: Windows 10 + cmd + MySQL5.6.36 + InnoDB
I. Basic Elements of transactions (ACID)
1. Atomicity: All operations after the
MySQL supports four transaction isolation levels and mysql supports four types of transactions.
Test environment of this experiment: Windows 10 + MySQL5.6.36 + InnoDB
I. Basic Elements of transactions (ACID)
1. Atomicity: All operations after the
The mysql master is not synchronized, and the system prompts that the record cannot be found for the update. The mysql Master/Slave
View the status of a cluster: show slave status \ G
The original library prompt is: Last_Error: Coordinator stopped
1. How PHP session worksThe Session file is stored on the server. By default, the Directory of the SESSION file is specified by session. save_path. The file name is prefixed with sess _ and followed by session id, for example, sess_c000065af28a8b14c0
What is CURL? PHP and CURL?
(Php curl)
1. What is CURL?
Curl is a File Transfer tool that uses the URL syntax to work in the command line mode. Curl is a File Transfer tool that uses the URL syntax to work in the command line mode.
It supports many
In-depth understanding of mysql Data Transmission coding principles, in-depth understanding of mysql
I. Basic concepts (Here we reference http://www.laruence.com/2008/01/05/12.html)
1. Given a series of characters, assign a value to each character
This article describes how to implement the session custom session processor in php. you can set the session. save_handler is a user that calls a custom callback function to implement the session custom session processor function, which is very
Replace the phpsession class with the mysql memory table. you can test the effect on your own.
The code is as follows:
/**
@ Usage: use some other storage method (mysql or memcache) instead of php sessoin
@ Author: lein
@ Version:
Friends who have used SESSION in PHP may encounter such a problem. SESSION variables cannot be transferred across pages. This has plagued me for a few days and finally solved this problem by checking the information. I think the reasons for this
Aside from cookie use sessionPHP, SESSION cannot be transferred across pages. the solution may be that SESSION users who have used SESSION in PHP may encounter such a problem. SESSION variables cannot be transferred across pages. This has plagued me
Using the PHP cURL library, you can easily and effectively capture webpages. You only need to run a script and analyze the web page you crawled, then you can get the desired data in the form of a program, whether you want to retrieve part of the
Pg_dump periodic backup OS in linux: CentOSDB: PostgreSQL93, OSuser: S 1. Compile the pg_dump backup script: 01getthedayofweek1-7startingmon = 102DOW = 'date + & quot; % u & quot; '0304de periodic backup of pg_dump in linux OS: CentOS DB: PostgreSQL9
The following is the binary log data of MySQL. Problem 1: log *! Cbinary **! *; And *! Cutf8 **! *; What is the role? Usage scenario: parse binary logs, store them in the database, and retrieve them and execute them to another database. Problem 2:
From the binlog information of the master server: #16031010: 49: Success *! *; SET @ session. SQL _mode1075838976 *! *; ROLLBACK *! *; # Why does ro... mysql appear in at1620489?
From the binlog information of the master server:
#160310 10:49
The session lifecycle in PHP first describes the process from the beginning to the end of session creation.
When the program needs to create a session for a client request, the server first checks whether the client contains a session id, this is
Yii operation session instance introduction, yiisession instance. Yii operation session instance introduction, yiisession instance this article describes how to use session in the Yii Framework, the specific steps are as follows: 1. differences with
This article describes how to explain the transaction isolation level and lock relationship of Innodb in MySQL. it is based on the experience of the technical team of Meituan. if you need it, refer
Preface:
We all know the several properties of
New project accepted, master-slave database replication synchronization error, ErrorCode1292 (invaliddatatype), check server SQL _MODE found to be empty. This is strange, default
Accept new project, master-slave database replication synchronization
First of all, for the theory of literacy, you need to understand ha what it is and whether it is similar to other high availability, not much to say. You can look down.Juniper-netscreen os ha High availability configuration
HA
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