Catch block, including the database metadata operations shown in Listing 3.
catch块中，包括清单3所示的数据库元数据操作。
However, optimization decisions are a complex function of various attributes, including the database environment and query characteristics, as well as the data itself.
然而，优化决策是各种属性的复杂函数，这些属性包括数据库环境、查询特征以及数据本身。
Connection configuration-a set of required property values used to create database connections, including the database version, database vendor, port number, and host name.
连接配置——用来创建数据库连接的一组必需的属性值，包括数据库版本、数据库厂商、端口号和主机名。
Connection configuration-a set of required property values used to create database connections, including the database version, database vendor, port number, and host name.
连接配置——用来创建数据库连接的一组必需的属性值，包括数据库版本、数据库厂商、端口号和主机名。
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