导出表中的部分（query)：
expdp hmt/123456 dumpfile=hmtdb20130301_hmt_log.dmp directory=hmt_dir tables = fct_hmt_log query=fct_hmt_log:'”where show_date <= 20121010″‘
注意：有单引号包含双引号
导出多个表(tables)：
expdp hmt/123456 dumpfile=hmtdb20130301.dmp directory=hmt_dir tables = DATES, DIM_CITY_PROVINCE, DIM_DOMAIN_TYPE, DIM_DOMAIN_TYPE_R, DURATIONS,HOURS
expdp hmt/123456 dumpfile=hmtdb20130301.dmp directory=hmt_dir tables = DATES, DIM_CITY_PROVINCE, DIM_DOMAIN_TYPE, DIM_DOMAIN_TYPE_R, DURATIONS,HOURS