Cloud computing is one of the most demanding technology in today's era. At one side, where cloud computing is offering unlimited amount of IT resources to provide exceptional performance in computing but on the other side, it is facing the security issues majorly with public cloud for multitenant cloud environment. Due to the security issues with public cloud, most of the government and private organizations are not moving their private and sensitive data over the public cloud and compromising with the limited IT resources available to them and limited performance from available resources. A solution to secure private space over the public cloud will resolve the aforesaid issues. This paper presents ${\mathit{SA}}^2\text{-}\mathit{MCD}$: Secured Architecture for Allocation of Virtual Machine in Multitenant Cloud Databases. This proposed architecture is used for public cloud which provides the private space over multitenant public cloud environment. Moreover, ${\mathit{SA}}^2\text{-}\mathit{MCD}$ is used for efficient distribution of transactions in distributed databases over the public cloud to offer the secured and remarkable performance. It is useful for both software and hardware level security. Random encryption selection method (RESM) for software level security and N_port zoning, F_port zoning, logical unit number (LUN) masking, node_port_ID virtualization (NPIV), raw device mapping (RDM) have been used for hardware level security in ${\mathit{SA}}^2\text{-}\mathit{MCD}$ architecture. The proposed architecture has been evaluated mathematically and simulated through CloudSim 3.0.3 tool. The experimental results reveal that the proposed architecture ${\mathit{SA}}^2\text{-}\mathit{MCD}$ gives the better performance as compared to the existing architectures such as T-MMORRS, MGA, DPRA and PRP.

云计算是当今时代最苛刻的技术之一。一方面，云计算提供无限量的IT资源以提供卓越的计算性能，但另一方面，它面临的主要是针对多租户云环境的公共云的安全性问题。由于公共云的安全问题，大多数政府和私有组织都没有在公共云上移动其私有和敏感数据，并损害了他们可用的有限IT资源和可用资源的性能。一种通过公共云保护私有空间的解决方案将解决上述问题。本文介绍${\mathit{南非}}^2\text{--}\mathit{MCD}$：用于在多租户云数据库中分配虚拟机的安全体系结构。该提议的体系结构用于公共云，该公共云在多租户公共云环境上提供私有空间。此外，${\mathit{南非}}^2\text{--}\mathit{MCD}$用于在公共云上在分布式数据库中进行有效的事务分配，以提供安全且卓越的性能。这对于软件和硬件级别的安全性都是有用的。用于软件级安全和N_port分区，F_port分区，逻辑单元号（LUN）屏蔽，node_port_ID虚拟化（NPIV），原始设备映射（RDM）的随机加密选择方法（RESM）已用于${\mathit{南非}}^2\text{--}\mathit{MCD}$建筑。通过CloudSim 3.0.3工具对提出的体系结构进行了数学评估和仿真。实验结果表明，提出的架构${\mathit{南非}}^2\text{--}\mathit{MCD}$与诸如T-MMORRS，MGA，DPRA和PRP之类的现有体系结构相比，它具有更好的性能。