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。

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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。

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As expected, the dump file (DMP) is approximately 8 MB in size, corresponding to the trace buffer size that was specified on the db2trc command.

与预期一样，转储文件(dmp)大小约为8 MB，跟db 2 trc命令中指定的缓冲区大小相符。

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