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dss database service subsystem 数据库服务子系统
If the database system you are monitoring is for decision support (DSS), and the queries are long and complicated, don't have the quality control (QC) agent run a large query.
如果要监视的数据库系统是用于决策支持(DSS)的，查询比较长而且比较复杂，那么不要让质量控制(QC)代理运行大型的查询。
For example, if your database is used for transaction processing and heavy decision-support (DSS) queries, you can be sure that a non-scheduled DSS query will trash your transaction performance.
例如，如果您的数据库用于事务处理和繁重的决策支持(DSS)查询，则可以确定非预定的DSS查询将牺牲您的事务性能。
General tuning tips are the same regardless of the database workload, but differences do exist between OLTP and DSS workloads.
无论数据库负载如何，通用的调优提示都是相同的，只是OLTP和DSS工作负载之间存在差别。
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