2 Decision Rules for the Execution phase According to the transaction properties, we evaluate the FPS and FCB to decide which one to employ. Specifically, the number of intra-transaction pages in a transaction is T α and the number of inter-transaction pages in a transaction is T We denote the minimal β. number of pages with temporal locality as In general, if less than σ. T+T σ, meaning that temporal locality are not prominent, FLB is used. However, if the transaction property has prominent temporal locality (i.e., larger than we α T+T σ), shall select the schemes from FCB or FPS. Specifically, use FPS if that α/β> (meaning intratransaction locality is the major temporal locality), and use FCB if (meaning α/β<φ that inter-transaction locality is the major temporal locality). Use FPS or FCB to retrieve cache, the cache contains intra-transaction, inter-transaction pages and some other pages which are not available in the cache. Hence, the extra page access incurs cache miss and replacement cost. Therefore, similarly to the derivation in Section 3.1, we can determine as follows. σ (T-σ)(CM+CR)<CM*T Once the corresponding thresholds, i.e., and are determined for DAR, one can ε, φ σ, employ these decision rules derived in the initial phase and in the execution phase for the selection of proper cache methods. Decision Rule for the Execution Phase Determine the minimal number of temporal locality pages from σ (CM+CR)(T-σ)< CM*T If T+T then (α β) >σ) Using FLB else using FPS α/β>φ_=> using FCB α/β<φ=> Conclusion:- We examined in this several cache retrieval schemes to improve the efficiency of cache retrieval. In particular, we analyzed the impact of using a coordinator
2 Decision Rules for the Execution phase According to the transaction properties, we evaluate the FPS and FCB to decide which one to employ. Specifically, the number of intra-transaction pages in a transaction is α T and the number of inter-transaction pages in a transaction is T β. We denote the minimal number of pages with temporal locality as σ. In general, if T+T less than σ, meaning that temporal locality are not prominent, FLB is used. However, if the transaction property has prominent temporal locality (i.e., α T+T larger than σ), we shall select the schemes from FCB or FPS. Specifically, use FPS if α/β> (meaning that intratransaction locality is the major temporal locality), and use FCB if α/β<φ (meaning that inter-transaction locality is the major temporal locality). Use FPS or FCB to retrieve cache, the cache contains intra-transaction, inter-transaction pages and some other pages which are not available in the cache. Hence, the extra page access incurs cache miss and replacement cost. Therefore, similarly to the derivation in Section 3.1, we can determine σ as follows. (T-σ)(CM+CR)<CM*T Once the corresponding thresholds, i.e., ε, φ and σ, are determined for DAR, one can employ these decision rules derived in the initial phase and in the execution phase for the selection of proper cache methods. Decision Rule for the Execution Phase Determine the minimal number of temporal locality pages σ from (CM+CR)(T-σ)< CM*T If (α T+T β) >σ) then Using FLB else α/β>φ_=> using FPS α/β<φ=> using FCB Conclusion:- We examined in this several cache retrieval schemes to improve the efficiency of cache retrieval. In particular, we analyzed the impact of using a coordinator
90515682-Mobile-Computing.docx