You want to track and store all transactional changes to a table over its lifetime. To accomplish this task， you enabled Flashback Data Archive with the retention of 5 years. After some time， the business requirement changed and you were asked to change the retention from 5 years to 3 years. To accomplish this， you issued the following command： ALTER FLASHBACK ARCHIVE fla1 MODIFY RETENTION 3 YEAR； What is the implication of this command？（） The command produces an error because the retention time cannot be reduced.。 All historical data is retained but the subsequent flashback data archives are maintained for only three years.。 All historical data is purged and the new flashback data archives are maintained for three years.。 All historical data older than three years is purged from the flashback archive FLA1.。
失业人员在领取失业保险金期间，停止参加职工基本医疗保险，不享受基本医疗保险待遇。
The database has the data block size set to 8 KB. You need to import a tablespace with a 4 KB block size into the database. Which additional memory parameter（s） should be configured to perform a transportable tablespace import？（） DB_4K_CACHE_SIZE only。 DB_8K_CACHE_SIZE only。 DB_BLOCK_SIZE and DB_4K_CACHE_SIZE。 DB_BLOCK_SIZE and DB_8K_CACHE_SIZE。 SGA_TARGET and DB_4K_CACHE_SIZE。 DB_CACHE_SIZE only。
下述哪种剂量可产生副作用（） 治疗量。 极量。 中毒量。 阈剂量。 无效量。
浇注式沥青混凝土主要用于钢桥面中，由于浇筑式沥青混凝土不同于现行通常使用的加热拌和式沥青混凝土依靠碾压成型构成铺装。因此，浇筑式沥青混凝土的配合比和施工方法与一般沥青混凝土桥面铺装截然不同，其工程造价的组成更是差距较大
Given that Triangle implements Runnable， and：
Which two statements， inserted independently at both lines 35 and 41， tend to allow both threads totemporarily pause and allow the other thread to execute？（）
