SQL Server 2012 Building Database AlwaysOn (Database High Availability Cluster)

To achieve a highly available database cluster, the following aspects need to be considered:1. Database selectionSelect a database that supports high availability

To achieve a highly available database cluster, the following aspects need to be considered:

1. Database selection

Select a database that supports high availability. The commonly used high availability databases currently include mysqlcluster, mongodb, postgreSQL, oraclerac, sqlserveralwayson, etc.

2. Cluster architecture

Design an appropriate cluster architecture based on application scenarios and requirements. Common cluster architectures include master-slave replication, multi master architecture, and shared storage architecture. Master slave replication is the most common method, which can perform write operations on the master node and read operations on the slave node. When the master node fails, the slave node can automatically switch to the master node.

3. Load balancing

To ensure load balancing for all nodes in the cluster, load balancing technology can be used. Commonly used load balancing techniques include DNS polling, LVS, haproxy, and so on.

4. Data synchronization

To ensure data synchronization between nodes, synchronous replication can be used. The commonly used synchronous replication methods include asynchronous replication and semi synchronous replication. Asynchronous replication refers to the primary node sending data to the secondary node, but not caring whether the secondary node has already received the data. Semi synchronous replication requires the master node to wait for at least one slave node to receive data before proceeding with the next write operation.

5. Monitoring and Management

For a highly available database cluster and each node within it, monitoring and management are required. Tools such as Zabbix and Nagios can be used to monitor and alert database clusters, ensuring timely detection and handling of faults.

In summary, achieving a highly available database cluster requires consideration of database selection, cluster architecture, load balancing, data synchronization, monitoring, etc.

SQL Server 2012 is highly available, which means that when the server on which it is located fails, it can automatically switch to the slave library to achieve failover and ensure that the service will not be interrupted!

This tutorial follows the steps of sqlserver2012 as follows:

1. Environmental configuration
2. Domain environment construction
3. Configure Failover
4. Build database alwayon

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Install SQL on the node server separately and install all functions

Sql service changed to domain account, alwayson enabled

Create a database on the main database node

Click to create alwayson

create name

Select the library and create backup files (full backup and log backup)

Check all options, and both the main and auxiliary items can be read and written

Add secondary node

Set Parent Node Readability

Add Listener

Create a shared folder for data synchronization

Next to completion

Initialization creation completed

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