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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.

select
column_name,
data_length,
char_length,
avg_char_len,
char_col_decl_length
from
dba_tab_columns
where
table_name = 'MYTAB'

or:
select
   max(vsize(mycol))
from
   mytable;


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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