Tang Yanjun

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This article introduces a model of crash recovery applied in main memory database combined the practical features of the main memory database. This model expatiates the primary step of crash recovery in main memory database by taking the cause of crash occurring and the method of recovery into account and combined the typical operations of crash recovery. A(More)
This article introduces a model of transaction processing applied in main memory database combined the practical features of the main memory database. This model expatiates the primary step of transaction processing in main memory database by taking the memory's high I/O speed into account and combined the typical operations of transaction processing. A(More)
Shrimp wastewater was studied by using photosynthetic bacteria sludge method. The results indicated that this method got better effects than single sludge or only photosynthetic bacteria treatment. The removal of the CODcr could reach 63%, the removal of the NH3-N could reach 92.5£¥. Compared with conventional methods, it had easier(More)
With the rapid development of secondary fiber industry, more and more attention to the pollution discharge from its effluents and sludge were caused. The toxicity studies on coated white board effluents of secondary fiber were carried out by using optimized photo bacteria method. The results showed that the value of EC50 for acute toxicity in coated white(More)
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