website failover

1. Switch: User actively switch;2. Failover: Main Library failure, forced to switch; Switchover: General switchover switch are planned to switch, characterized by switching, will not lose any data, and this process is reversible, the entire dataguard environment will not be destroyed, All physical and logical standby in the original Dataguard environment can continue to work.Before you make a physical standby switch for Dataguard, you need to be awar

Before you create a SQL Server 2000 failover cluster, you must configure Microsoft Cluster Service (MSCS) and use the Cluster Administrator in Microsoft Windows NT4.0 or Windows 2000 to create at least one cluster disk resource. Before running SQL Server Setup, note the location of the cluster drive in the Cluster Administrator because this information is required to create a new failover cluster. Only SQL

A failover cluster must meet certain requirements of the hardware, software, and network infrastructure, and it requires an administrative account with the appropriate domain permissions. Specifically as follows: (i) Hardware requirements for failover clusters In a failover cluster, the following hardware is required: (1) Server: It is recommended that you use

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 reason, you attempt to evict a node from a failover cluster, you can use the last procedure in this topic to force t

Problem Database mirroring has become a popular feature in SQL Server 2005. With the following simple steps, using the SQL Server Management suite or running some T-SQL commands, you can easily create database mirroring in one or more of your databases. One of the configuration options for database mirroring is high availability mode. With this option, the principal, mirror, and witness three servers are placed in the appropriate location. This is the only option that allows automatic troublesh

We've written a lot of SQL Server-related articles in the near future, in order to improve the usability of the service, we think of the deployment AlwaysOn, the previous environment just deployed SQL Server Failover Cluster, so decided to put the cloud in a SQL Server to configure AlwaysOn, the idea is to add a node to the local SQL Server Failover cluster, then place the new home node in the Azure cloud a

1 Flush any unsent redo from the primary database to thetarget standby database. If the primary database can be mounted, it may be possible to flush any unsent archived andcurrent redo from the primary database to the standby database. if thisoperation is successful, a zero data loss failover is possible even if theprimary database is not in a zero data loss data protection mode. Ensure that Redo Apply is active at the targetstandby database. Sta

The previous gitlab dual-host mutual backup environment (refer to the previous blog post) still has a problem: the backend database is a single server and there is a risk of spof. In the past few days, we have investigated relevant materials, mysql-proxy can be used to solve this problem. Environment required: Build a master-slave environment with two MySQL servers: Master-Master Build mysql-proxy on one serverSummary 1. Set up the MySQL Master/Slave environment: Master-Master 2. Implement

Today, we demonstrated the switching process between switchover and failover on the virtual machine. The customer is concerned with failover. We directly turn off the virtual storage switch to simulate array faults. Failover steps are as follows: 1. SelectNAME, RESETLOGS_TIME, LOG_MODE, OPEN_MODE, PROTECTION_MODE, REMOTE_ARCHIVE, DATABASE_ROLE, SWITCHOVER_STA

15.6 Upgrading AlwaysOn Failover Clusters15.6.1 PrerequisitesThe prerequisites for upgrading an FCI (failover cluster instance) are roughly the same as for upgrading a standalone instance.You cannot upgrade a standalone instance to an FCI. If you need to upgrade a standalone instance of SQL Server to an FCI, you must do so by following these steps.(1) Install the FCI.(2) Migrating the user database database

If we want to ensure high availability of SQL Server, we can adopt a Failover cluster. The simplest failover cluster is two servers, one active server and the other standby server. This is the cluster in AP mode. Another mode is the AA mode, that is, both servers are running SQL Server instances. SQL Server does not have RAC like Oracle, so it is impossible to say that the two servers run the same instanc

Label:1.failover Pre-check#如果有多个standby数据库 to see which standby received the latest redo. sql> SELECT * from V$archive_dest_status; #查看standby库接收到的最新的SCN sql> Select thread#,sequence#, Last_change#,last_time from V$standby_log; thread# sequence# last_change# last_time ---------------------------------------------- 1 7128 126385274 2 May-April -16 1 0 0 1 0 0 sql> 2. Exe

= "Wkiol1tdjkisrhltaahrywrz6cy384.jpg"/>go to one of the file servers and link the shared disk. Configure the iSCSI initiator on the server , link the shared disk, enter the host name of the emulated virtual disk in the target, two file servers to link the shared disk, and then enter two servers respectively, install the required roles such as file services; After the role is added, The failover cluster feature is then added for two servers respective

I haven't written a blog for a long time. We have recently studied storm, flume, and Kafka. Today, I will write down the scenarios and conclusions for testing flume failover and load balance; The test environment contains five configuration files, that is, five agents. A main configuration file, that is, the configuration file (flume-sink.properties) for configuring the Failover and load balance relationshi

Dataguard is an important solution officially recommended by Oracle for the MongoDB architecture. Currently, RAC + Local federation uard + Remote Federation uard has become a common HA architecture in the industry. Switchover and failover are the most common operation scenarios for RAC and replica uard.Failover is an unplanned switchover action. Generally, the Primary database Primary has a hardware and software fault. If you cannot continue to provid

How can I use the flashback database feature to restore the replicasuard environment after a failover ?, FailoverdataguardThe 11g slave uard standby is cut into the master database. After the test is completed, it is restored to the original standby environment.#######################Overview:11204 if a single machine implements dg on a single machine, standby needs to be enabled because of the local requirement (read/write mode). In this case, the or

This article mainly describes how to deploy SQLServer2016 Failover Cluster in Windows Server 2016, and what is Failover Cluster, see the Microsoft technical documentation.Deployment environment numbering Server name IP Address Operating System 001 AD1 192.168.100.250 Windows Server Datacenter Evaluation 002 Storage 192

Label:Build SQL Server AlwaysOn second (configure failover cluster) starting from 0First articleHttp://www.cnblogs.com/lyhabc/p/4678330.html Second articleHttp://www.cnblogs.com/lyhabc/p/4682028.html This second article, starting from 0, builds SQL Server AlwaysOn, which focuses on how to build a failover cluster because AlwaysOn is a Windows-based failover clu

Before creating an SQL Server 2000 failover cluster, you must Configure Microsoft cluster service (MSC) and use the Cluster Administrator in Microsoft Windows NT4.0 or Windows 2000 to create at least one cluster disk resource. Before running the SQL Server installer, log on to the Cluster Administrator to locate the cluster drive, because this information is required to create a Failover cluster. 1. on the

15.5 Remove AlwaysOn Failover clusters15.5.1 PrerequisitesTo remove an AlwaysOn failover cluster, you must use the permissions of the local administrator and the permissions for all nodes that are logged on to the failover cluster.You must run the SQL Server Setup Wizard from each node of an AlwaysOn failover cluster t