提高informix数据库运行效率的策略与措施（Strategies and measures to improve the efficiency of Informix database operation）.docVIP

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提高informix数据库运行效率的策略与措施（Strategies and measures to improve the efficiency of Informix database operation）.doc

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提高informix数据库运行效率的策略与措施（Strategies and measures to improve the efficiency of Informix database operation）

提高informix数据库运行效率的策略与措施（Strategies and measures to improve the efficiency of Informix database operation） INFORMIX database is a relational database is widely used, how to improve the application performance is a topic of concern to everyone, especially with the library data processing and application of trading volume continued to increase, the efficiency problem is particularly prominent. In addition to the full application of the new INFORMIX quality, from INFORMIX SE to INFORMIX ONLINE high version, operation efficiency and system parameters of INFORMIX database (online) configuration, performance tuning, database table creation way, indexing strategy, ESQL/C program quality directly related. This paper introduces the following work practice to improve efficiency of the INFORMIX database, some optimization strategies and measures. A INFORMIX system performance parameter optimization The performance of the system with the disk, CPU, memory and network sharing. On the principle of adjustment is to reduce disk loading times, each time the amount of data to maximize disk, data distribution, to prevent the occurrence of bottleneck. Online disk space should be used bare equipment (raw device), the way without using the file system (cooked file), the former is much faster than the latter processing speed and high reliability. The physical log cache space should be 30 ~ 50 MB, should not be too high. The number of CPU VP CPU to set the number of minus 1 (if the CPU number is 1, CPU is 1 VP). Shared memory is the memory of the 1/3 system to 1/4, a CPU VP 4 LRU n LRU queue, queue with a n page refresh process page_cleaner, the tuning cache read hit rate is greater than 95%, write hit rate is greater than 85%, set the number of card can improve performance, the network collision rate should be less than 8%. This system parameters according to the core version of the Informix configuration requirements can be adjusted, if not adjusted, when constructing the online that may