failover

Oracle RAC also has ha (high availiablity) and lb (loadbalance). And its high availability is based on failover (failover). It means that the failure of any node in the cluster will not affect the user's use, the user connected to the failed node

Select| comparison Table TableName must exist when insert INTO TableName Table cannot exist when select * into tablename The SELECT * into TableName is fast when the database failover model is simple, because select * into tablename does not

Hardware requirements for Windows Server 2012 Windows Server 2012 was officially released online on September 4, allowing customers to finally buy the latest server operating system. However, since the official version has just been released, many

This topic explains how to use the Failover Cluster Management tool or Cluster.exe to evict a node from a Windows Server 2008 failover cluster. After a node is exited from the cluster, the node cannot host the clustered mailbox server. If, for any

Customer issues 1. Why should the DC be equipped with 172 intranet address? 2.10 of the address of the network card is heartbeat, if this heartbeat problems, what will happen? 3. For insurance purposes, you will be required to bind two heartbeat

The role switching between Data guard master and subordinate libraries is divided into the following two kinds: 1) Switchover Swithchover are usually artificial and planned for role swaps, such as upgrades. It is usually lossless, that is, there

Third, using DHCP (using DHCP) The PIX firewall supports Dynamic Host Configuration Protocol (DHCP) servers and DHCP clients. DHCP is a protocol that provides automatic configuration parameters to an Internet host. This protocol has two components:

As one of the core devices in the LAN, the performance of the switch directly determines the data transmission performance of the network. However, after a long period of work, the switch will inevitably encounter such or such a fault phenomenon, in

In the Linux system of SSH port forwarding, there are many kinds of forwarding operations, but also a good use of the port using the program, so today we have to know about the SSH port forwarding specific content it! Typically, two different

1. Brief introduction The Memcache module is an efficient daemon that provides procedural and object-oriented interfaces for memory caching, especially for reducing access to the database when designing Dynamic Web programs. Memcache also

Access control is one of the most confusing concepts of the day, because it is often disabled, and when availability needs to be secured, access control is required, is this the reason for enabling ha to configure it first? What is HA access

We've heard a lot about the desktop version of Windows 7, and the most recent news is that Microsoft says it will no longer release the beta version of Windows 7, and the next upgrade will be the RC version closest to the final release, which means

In each column, "WebSphere contrarian investors" will answer questions, provide guidance and discuss the underlying topics associated with WebSphere products, often giving proven recommendations that contradict popular perceptions. Knowledge

Objective According to the market research and analysis agency Gartner published "Data warehousing Trends for the CIO, 2011-2012" 1, Appliance (one machine) technology has become a data warehouse, the field of future market hotspots. The IBM

This paper uses Oracle 11g Dataguard broker Switchover Test 1. Using Dataguard Broker Test switchover 1 Main Library situation Sql> select Open_mode,database_role,db_unique_name from V$database; Open_mode Database_role Db_unique_name -----------

In a network with Network Load Balancing (NLB) deployed, when a customer initiates a connection request against an NLB virtual address, NLB determines the NLB node for the customer service through some NLB algorithm, usually determined by the client

With the introduction of Windows Server 2008 R2, Hyper-V can now be moved from one host to another. This version of Windows Server is also the first version to be launched with Windows clients in 10 years. As a result, the Windows Server 2008 R2

A "virtual" server made up of two or more physically separate servers is called a clustered server. A Microsoft service called the Microsoft Cluster Service (MSCS) can manage cluster servers. A SQL Server cluster is a virtual server consisting of

j2ee| Program In the recent past, Java developers were aware of the tools they were going to use when preparing a new enterprise Java development Project. At the time, everything was simple: Java EE was new, HTML browsers were recognized as user

Mark, I was asked today by colleagues about the application of keepalived, and LVS (their respective functions a bit mixed). Mark: Keepalived is a highly available software, running on the LVS, its main function is to achieve the real machine fault