行基是日本奈良时代的高僧。公元668年出生于和泉国大鸟郡（现今大阪府堺市），15岁出家奈良京薬师寺，24岁受戒得度受具足戒。日本在8世纪初期，律令制度开始步入正轨。但律令制度下沉重的税赋徭役，却令民众苦不堪言。
大对象(lob)内联—小的LOB可存储在基表的格式化行中。
Large object (LOB) inlining - Small LOBs can be stored in the formatted rows of the base table.
从外部表选择可从一个或多个数据文件读取数据，并以行和列的形式提供该数据，就好像从常规基表读取数据一样。
Selecting from an external table reads the data from the data file(s) and provides it in the form of rows and columns as if it was read from the normal base table.
如果我们需要出于维护目的而运行代理流(如处理或清除在数据基表中积累的行)，则很可能出现这种情况。
This scenario would occur most likely if we needed a broker flow to run for a maintenance purpose, such as processing or clearing rows that have accumulated in a data base table.
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