This function returns the size of the value buffer on success and 0 if the name specified is not a valid environment variable name.

如果成功，则此函数返回值缓存的大小，如果指定的名称并不是一个合法的环境变量名，则返回0。

youdao

This could become one more optional option, and a default buffer size of whatever value you prefer could be used if this option is not specified, as I've done for the "-l" number option.

这可以成为又一个可选选项，并且当没有指定该选项时，将使用您更喜欢的值作为缺省的缓冲区大小，就象我对“- l”数字选项所做的那样。

youdao

Use the -fd option, which would generate the db2fopt commands required to tell the optimizer to use the specified size rather than calculating based on the buffer pools available for this database.

使用将生成必要的db 2 fopt命令的- fd选项来告诉优化器使用指定大小，而非基于对该数据库可用的缓冲池进行计算。

youdao