Storage Retrieval

Download Continuous Media Databases by Aidong Zhang, Avi Silberschatz, Sharad Mehrotra PDF

By Aidong Zhang, Avi Silberschatz, Sharad Mehrotra

Continuous Media Databases brings jointly in a single position very important contributions and updated study ends up in this fast-paced region.
Continuous Media Databases serves as a superb reference, supplying perception into essentially the most not easy examine concerns within the field.

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As expected, the sequential policies perform poorly because they exhibit significantly longer replication times and therefore, are not as responsive to the workload. The injected sequential policy and piggybacked sequential policy have similar performance because there is only a negligible overhead for the piggybacked sequential policy for this large scale VOD system. When the arrival rate is low, the difference on performance among the different policies are not too large due to the fact that the system is only lightly loaded.

El ········13· ...... 3o:--------~10~-------2~0--------~30---------4O~-------~50--------60 Hard Limit on Replication Streams Figure 13. Significance of parallel replication. 51 56 LIE, LUI AND GOLUBCHIK Upper Bound Injected & Piggybacked Parallel Replication Injected Parallel Replication Piggybacked Parallel Replication Injected Sequential Replication Piggybacked Sequential Replication No Replication --<>-_. + .. " .... 2 o~--~----~----~----~----~----~----~--~----~~ o Figure 14. 9 Effect of varying movie popularities distribution.

Comparison of different policies In this section, we compare the performance of various replication policies, and examine the effect of tuning various parameters of the replication algorithm. 3, in this section we disable the de-replication policy and keep the popUlarity distribution constant, which should result in a more fair 48 53 THRESHOLD-BASED DYNAMIC REPLICATION comparison. To measure the performance of the different replication policies, we define the acceptance rate to be the number of accepted customers divided by the number of arrivals during the movie replication period.

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