## 3 Results
Regarding vmstat, the amount of memory used for the page cache field (cache) and the amount of free memory currently available field (free) for DA, OLTP, and DW were larger than those of other fields. These two fields are significantly larger than the other fields, thus the other features are invisible in the graph. The cache capacity was similar for OLTP and DW, and both of them were higher than those of DA. Free capacity was also similar for OLTP and DW, and both were lower than those of DA. Table 7 presents the results obtained from measuring disk I/O status (disk) for 1 min during the test runtime. Regarding disks, DA, OLTP, and DW all recorded the largest value in the average size of write requests (wareq-sz), followed by the largest number of write requests per second (w/s). These values were obtained from 1 to 3 peaks for 1 min in all DB types. The rates of disk-related fields were similar for DA, OLTP, and DW. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**DB Type** & **Scale** & **TPS** & **Avg. Latency** & **90\%\textless{}** & **Max Latency** \\ \hline DA & 1 & 34,758 & 0.081 & 0.088 & 0.323 \\  & 10 & 34,131 & 0.082 & 0.090 & 0.668 \\  & 100 & 33,985 & 0.083 & 0.089 & 0.405 \\  & 1000 & 31,161 & 0.091 & 0.100 & 2.086 \\ OLTP & 1 & 67,752 & 0.126 & 0.160 & 6.104 \\  & 10 & 66,829 & 0.128 & 0.162 & 7.385 \\  & 100 & 65,800 & 0.130 & 0.165 & 8.161 \\  & 1000 & 62,535 & 0.138 & 0.176 & 7.512 \\ DW & 1 & 47,046 & 0.102 & 0.113 & 2.780 \\  & 10 & 48,422 & 0.096 & 0.106 & 0.985 \\  & 100 & 48,172 & 0.096 & 0.106 & 1.059 \\  & 1000 & 45,492 & 0.103 & 0.113 & 34.36 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: TPS, average latency, 90 th percentile latency, and maximum latency by scale. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**DB Type** & **Client** & **TPS** & **Avg.Latency** & **90\%\textless{}** & **Max_Latency** \\ \hline DA & 1 & 13,778 & 0.071 & 0.075 & 0.220 \\  & 2 & 24,531 & 0.080 & 0.087 & 1.049 \\  & 3 & 33,916 & 0.086 & 0.09 & 0.874 \\  & 4 & 43,942 & 0.089 & 0.096 & 0.597 \\  & 5 & 51,376 & 0.095 & 0.110 & 1.612 \\ OLTP & 1 & 13,839 & 0.071 & 0.076 & 0.262 \\  & 5 & 51,880 & 0.094 & 0.108 & 1.638 \\  & 10 & 75,988 & 0.128 & 0.144 & 4.134 \\  & 15 & 91,536 & 0.159 & 0.217 & 10.829 \\  & 20 & 95,403 & 0.200 & 0.284 & 19.591 \\ DW & 1 & 13,488 & 0.074 & 0.076 & 5.986 \\  & 3 & 32,761 & 0.091 & 0.095 & 15.557 \\  & 5 & 50,663 & 0.097 & 0.111 & 12.840 \\  & 7 & 63,109 & 0.108 & 0.121 & 6.617 \\  & 10 & 76,395 & 0.127 & 0.143 & 7.979 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: TPS, average latency, 90 th percentile latency, and maximum latency by client. **Note:**\(r/\)s: The number of read requests that were issued to the device per second. w/s: the number of write requests that were issued to the device per second. rMB/s: the number of megabytes read from the device per second. wMB/s: the number of megabytes written to the device per second. rqm/s: the number of read requests merged per second that were queued to the device. wrqm/s: the number of write requests merged per second that were queued to the device. \"rqm: the percentage of read requests merged together before being sent to the device. \"swrqm: the percentage of write requests merged together before being sent to the device. \"rawait: the average time (in milliseconds) for read requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them. w\({}_{\text{w}}\)wait: the average time (in milliseconds) for write requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them. aqu-sz: the average queue length of the requests that were issued to the device. rareq-sz: the average size (in kilobytes) of the read requests that were issued to the device. wareq-sz: the average size (in kilobytes) of the write requests that were issued to the device. wxtm: the average service time (in milliseconds) for I/O requests that were issued to the device.