Fig. 1. Overall architecture diagram of MPDAS system

Fig. 2. Flowchart of MPDAS data archiving

Fig. 3. Collection document models of ArchiveInfo and PVData

Fig. 4. Distributed cluster architecture of MongoDB

Fig. 5. Flowchart of MPDAS data division

Fig. 6. Snapshot of cryogenic test platform

Fig. 7. Screenshot of MPDAS data retrieval interface

Fig. 8. Trend of hot data hit rate with number of accesses

Fig. 9. Comparison of hit rate under different hot database capacities