A database client manages a transaction including two or more queries. A transaction analyzer checks if a transaction can be processed by more than one query processor. A query processor optimizer locates the optimum query processor for each query in the transaction based on workload of each ...
A few Ruby classes are involved in the load balancing process. All of them are in the namespaceGitlab::Database::LoadBalancing: Host LoadBalancer ConnectionProxy Session Each workload begins with a new instance ofGitlab::Database::LoadBalancing::Session. TheSessionkeeps track of the database ...
Ingitlab_rails['db_load_balancing'], create the array of the database hosts you want to balance. For example, on an environment with PostgreSQL running on the hostsprimary.example.com,secondary1.example.com,secondary2.example.com: RubyCopy to clipboard ...
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TCP— For applications that do not use HTTP or HTTPS, TCP traffic can also be balanced. For example, traffic to a database cluster could be spread across all of the servers. UDP— More recently, some load balancers have added support for load balancing core internet protocols like DNS and...
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Figure 9: Load balancing in a cloud environment. The downside of this method is in a server failure, the switchover to a different IP address is dependent on the Time-To-Live (TTL) configuration of the DNS cache. DNS entries are known to be long-living and updates are known to take ...
Without client load balancing, Oracle Net progresses through the list of protocol addresses sequentially until one succeeds. This normally is referred to connect-time load balance. 从上面的描述中可以得知,如果未开启load_balance=yes时,Oracle Net会根据地址列表按顺序来选择一个进行连接,直到连接成功为止...
Zero downtime – Having a load balancer hides non functioning databases. Servers can be removed from traffic for maintenance, without impacting applications. So in many cases, application downtime can be avoided. Load balancing has a prerequisite – that the database servers are somewhat synchronized...