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When I create a table with a CLOB in it, the CLOB column is reported to have a DATA_LENGTH of 4000:
create table test (
data clob
);
-- Returns 4000
select data_length from all_tab_cols
where table_name = 'TEST';
How can I interpret that? Is that some backwards-compatible tweak, considering that the limit for VARCHAR2 is also 4000? Or is this to indicate that I can only insert / update string literals of length 4000? Is this behaviour of SYS.ALL_TAB_COLS documented somewhere?
Up to 4000 bytes can be stored in-line in the tablespace. If the length of the CLOB exceeds 4000 bytes it must be stored in/readed from LOB storage area via special functions.
See also: