Data Type Limits Datatypes Limit Comments BFILE Maximum size: 4 GB Maximum size of a file name: 255 characters Maximum size of a directory name: 30 characters Maximum number of open BFILEs: see Comments The maximum number of BFILEs is limited by the value of the SESSION_MAX_OPEN_FILES initialization parameter, which is itself limited by the maximum number of open files the operating system will allow. BLOB Maximum size: (4 GB - 1) * DB_BLOCK_SIZE initialization parameter (8 TB to 128 TB) The number of LOB columns per table is limited only by the maximum number of columns per table (that is, 1000). CHAR Maximum size: 2000 bytes None CHAR VARYING Maximum size: 4000 bytes None CLOB Maximum size: (4 GB - 1) * DB_BLOCK_SIZE initialization parameter (8 TB to 128 TB) The number of LOB columns per table is limited only by the maximum number of columns per table (that is, 1000). Literals (characters or numbers in SQL or PL/SQL) Maximum size: 4000 ...