8TB 到128TB，和初始化参数db_block_size有关。block_size-8KB，那么最大为32TB。http://docs.oracle.com/cd/E11882_01/server.112/e40402/limits001.htm#REFRN0041Maximum size: (4 GB - 1) * DB_BLOCK_SIZEinitialization parameter (8 TB to 128 TB)db_block_size=2048 --- 23767
oracle clob 长度