11G RAC，前两天归档暴增，调出当时AWR，发现有个INSERT语句（表就两个字段：ID和MSG，MSG为BLOB类型）产生了大量REDO LOG，进而又产生了大量ARCHIVELOG。但，AWR里，SQL ORDER BY READS, SQL ORDER BY GETS两项，该语句均排名首位。网上说：

SQL ordered by Reads is the number of physical reads from your disks before you load the buffer cache and present the data to user process.
SQL ordered by Gets is the number of logical reads from the buffer cache to the user process.

一个新增记录的INSERT，为何会产生这么多SQL BY READS(GETS)呢？我个人觉得，只有SELECT 语句才会涉及BY READS(GETS)吧？哪位可以解释下？