与Oracle和SQL Server等其他关系数据库管理系统一样，Informix也有内部优化器，负责选择最佳的查询执行计划。

Like other relational database management systems such as Oracle and SQL Server, Informix has its internal optimizer, which is responsible for selecting the best query execution plan.

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分布式并行执行子系统负责具体的数据库操作。

Recovery from node failures is a critical issue in distributed and parallel database systems.

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