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Don Burleson Blog 







Find an Oracle table column size

Oracle Database Tips by Donald BurlesonJanuary 22,  2015


Question:  How do I find the length of an Oracle table column?  I have an XMLTYPE table column, but I cannot find any generic commands to find the length of a column.  Does Oracle offer a built-in function to show the average column length or the length of a specific table column?

Answer:  There are many ways to determine the length of a specify column, and it depends on the datatype.

Current to the last run of dbms_stats, you can use the DBA_TAB_COLUMNS view, using the AVG_COL_LEN or CHAR_COL_DECL_LENGTH columns.

table_name = 'MYTAB'


You can also use the PL/SQL vsize BIF:

select mycol_xml, vsize(mycol_xml) from mytab;

As I understand it, a "plain" xmltype is just a character string, and the char_length function should display the column length:

select length('Hello World') from dual;

Are you using a CLOB for the XMLtype storage?  If so, see here, finding the length of a CLOB column.



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