# Scaling Out Non-Distributed RDBMS Attempt A: Multi Nodes Shared Storage Architecture

__*Shared Everything Architecture Weakness*__

![`smart`](./student-guide/diagram/OracleRACArchitecture_en_001_20220428.png)

+ The inter-connection and the shared storage can cause performance bottlenecks

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No matter how many nodes are configured for the cluster, the data is stored on the shared storage, and the heartbeat in the middle is responsible for transmitting memory-level buffer cache as well, which is an obvious bottleneck

The most important thing to note is that this solution is costly.