This parameter is used by the sql optimizer to help estimate how much buffer pool will be available at run - time for the access plan chosen since the buffer pool is shared by all active applications connected to the database Sql优化器使用该参数来帮助评估在运行时有多少缓冲池可用于所选择的访问计划中（因为连接到数据库的所有活动应用程序共享缓冲池） 。
This guide provides reference and troubleshooting information for administrators who are deploying or have deployed communicator web access . the information in this guide supplements the information contained in the microsoft office communicator web access planning and deployment guide 这份指南说明在单一树系单一网域拓朴的实验室环境中，部署communicator web access所需的步骤。
As you can see , between the test and production , the only difference is the optimization level , which we intentionally changed from 5 to 3 just to show why one would not be successful in replicating the production access plan on a testing environment 正如您可以看到的，测试（ test ）和生产（ production ）之间的惟一区别就是优化级别（ optimization level ） ，我们特意将之从5修改为3 ，只是为了显示在测试环境中复制生产访问计划为何会不成功。
The latter situation , while less disturbing than the former , is far more common and without an alternative access plan in place business continuity is threatened ; regular business functions cannot occur , resulting in potential delays in product delivery , impediments to customer service , or other detrimental effects 尽管干扰要小于第一种，但是后一种情况目前越来越常见；同时现场没有可供使用的网络接入会威胁业务连续性、经常导致业务功能不能进行、导致潜在的交货延迟，阻碍顾客服务或其他有害的影响。
For example , in production , you could experience performance problems caused by a query that is using a poor access plan and want to replicate the access plan on a test system in order try some different strategies , such as manipulating the statistics , changing the optimization level , trying different settings for db2 registry variables , and so on , in order to improve performance 例如，在生产中，您可能会遇到使用糟糕访问计划的查询所导致的性能问题，并且需要在测试系统上复制该访问计划以尝试一些不同的策略，例如操作统计数据，修改优化级别，对db2注册表变量尝试不同的设置等等，以便提高性能。
