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This article tells the four characteristics (ACID) of transactions in the database, and will explain the isolation level of the transaction in detail.If a database claims to support transactional operations, then the database must have the following

This blog will show you how to use the SQL Compact in EF Code first. The SQL Compact is a free relational database launched by Microsoft, and the latest version is the SQL Compact 4.0. Microsoft's development tools vs 2010/sql Server 2008 and

Switch port operating mode can generally be divided into three kinds: access,multi,trunkThe port operating mode of the switch can be divided into three kinds: access,multi,trunk (trunk).Trunk mode ports are used for switches and switches, switches

I. Introduction of OPENTSDBThe open source monitoring system, OPENTSDB, uses hbase to store all the timings (without sampling) to build a distributed, scalable time-series database. It supports the second-level data acquisition of all metrics,

Gap Lock's internal locking principle gap Lock's front conditions:1 transaction ISOLATION level is Repeatable-read,innodb_locks_unsafe_for_binlog parameter is 0, and SQL Walk index is non-unique index2 The Transaction isolation level is the

forwarded from : original 2017-08-29 58 Shen Jian Architect's Road Database horizontal slicing is a very interesting topic, different business types, the method of horizontal segmentation of database is different.This article will take "Order

I. Overview of transactions1, in the application field of Java EE Enterprise Development, in order to ensure the integrality and consistency of data, it is necessary to introduce the concept of database transaction, so transaction management is an

Kairosdb(1) To/conf directory, find kairosdb.properties, modify Datastore to Cassandra(2) Setting the connection mode of Cassandra(3) Set user name password4. Start: Go to the/bin directory and run directly./kairosdb.sh Start, finally see KAIROSDB

(optimized from the bottom to the top)First, the storage layer optimization:Use RAID 1+0, do not use RAID 5/or RAID 6RAID disks use Mind 8 disks as a set of LUNs.Avoid running the database server disables Liunx soft LVM. (Severe impact on

ogg process split (single table split into multiple processes)Overview:The OGG process split describes how to split multiple tables in one inbound process into another process. This article will focus on how to use multiple processes to library a

The content of this article UDP protocol Sockets How to open a process Multi-process implementation of concurrent socket communication Join method Daemon process Sync Lock Process queue Producer Consumer Model

Parameters Introduction --api-enable-cors=false Remote API calls. -B,--bridge= "" Bridging the bridge device on a system into a Docker container, using none to deactivate the network in the container

In development, especially in Unity's cross-platform, we often roam across platforms such as Android, Apple, PC .... On this different platform, it is possible that we need to do different things. However, we can use Unity's own platform macro

Original source: http://www.cnblogs.com/Charltsing/p/EncryptVBACode.htmlVBA code encryption is a commonplace issue, and since my VBA dumper was released, any encryption at the office level has lost its meaning. So, many people began to move to the

Given an unordered array of arr, where elements can be positive, negative, and 0, given an integer k, for all of the subarray in Arr and the oldest array length less than or equal to K.For example: arr=[3,-2,-4,0,6], k=-2, add and less than or equal

Os:windows7 x64Jdk:jdk-8u131-windows-x64Ide:eclipse Oxygen Release (4.7.0)Code:/** by default, the constructor of a subclass calls the parameterless constructor of the parent class first, but the problem is, what if the parent class does not have a

The first spring boot programWritten in front: In view of the extensive details and knowledge of the spring annotations and the SPRINGMVC configuration, we will go directly to spring boot learning after learning comprehension and will be understood

Windump Windump is a classic network protocol analysis software for the Windows environment, with the UNIX version name tcpdump. It captures all data packets between two computers on the network for further traffic analysis and

Jquery (1)-style, jquery Style Jquery (1)-style1. $ (document). ready is used to execute subsequent code after all nodes in the document of the page are loaded, Because when executing code, we may depend on an element of the page. We need to ensure

Deep understanding of DOM copy clone () and deep dom copy clone A clone node is a common DOM operation. jQuery provides a clone method to process dom cloning: The. clone () method deeply copies all matching element sets, including all matching