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Updated on 2026-09-17 GMT+08:00

Dedicated DB Instances

This section provides test data of RDS for PostgreSQL 18 x86-based dedicated instances using cloud SSDs.

Test Data

**Table 1** vCPU:Memory = 1:2
vCPUs	Memory (GB)	TPS	QPS	IOPS
2	4	395.37	7,907.40	The input/output operations per second (IOPS) supported depends on the I/O performance of Elastic Volume Service (EVS) disks. For details, see Disk Types and Performance of Elastic Volume Service Service Overview.
4	8	1,107.08	22,141.25
8	16	1,618.11	32,362.14
16	32	1,781.84	35,636.77

**Table 2** vCPU:Memory = 1:4
vCPUs	Memory (GB)	TPS	QPS	IOPS
2	8	447.69	8,953.71	The input/output operations per second (IOPS) supported depends on the I/O performance of Elastic Volume Service (EVS) disks. For details, see Disk Types and Performance of Elastic Volume Service Service Overview.
4	16	996.54	19,930.76
8	32	1,881.73	37,634.70
16	64	2,675.86	53,517.95

**Table 3** vCPU:Memory = 1:8
vCPUs	Memory (GB)	TPS	QPS	IOPS
2	16	593.36	11,866.99	The input/output operations per second (IOPS) supported depends on the I/O performance of Elastic Volume Service (EVS) disks. For details, see Disk Types and Performance of Elastic Volume Service Service Overview.
4	32	1,077.46	21,549.12
8	64	1,708.09	34,162.06
16	128	4,439.11	88,782.17

Test Results

Figure 1 vCPU:Memory = 1:2

Figure 2 vCPU:Memory = 1:4

Figure 3 vCPU:Memory = 1:8

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