Check table access for Oracle SQL statements in BLOB - sql

Question

I have a table with a column containing SQL query (select statements only) in BLOB format.
I'm trying to figure out a way to analyse the SQL queries, and check which tables each SQL queries will be accessing.
Anyone done anything similar?
My thought right now is to create a PLSQL loop that:
Converts the BLOB to text to get the SQL query
Execute an explain plan for the query
Look at the result of the explain plan, and get all the lines with TABLE ACCESS
Edit: I'm on Oracle Database 11g Release 11.2.0.4.0 - 64bit if that helps, and have read-only access to the database, so I'll need to create a solution that's not intrusive to the DB.

Answer 1

This could be another simpler method.
Create dynamic views for those SQLs in the BLOB field.
EXECUTE IMMEDIATE 'CREATE OR REPLACE VIEW YOUR_VIEW_NAME AS '||
utl_raw.cast_to_varchar2(dbms_lob.substr(blob_field));
Query user_dependencies to get the referenced table names.
SELECT referenced_name AS table_name
FROM user_dependencies
WHERE type = 'VIEW'
AND NAME = 'YOUR_VIEW_NAME'
AND referenced_type = 'TABLE';

Answer 2

So, here is how I have done it:
DECLARE
b BLOB;
c CLOB;
n NUMBER;
BEGIN
-- << loop_through_table >>
FOR o IN (SELECT TRIM(LABEL) lbl, REQUEST req FROM REQUEST_TABLE) LOOP
b := o.req;
IF ((b is null) OR (LENGTH(b)=0)) THEN
DBMS_OUTPUT.PUT_LINE(o.lbl || ' : No query found');
CONTINUE;
END IF;
-- Convert the BLOB to text to get the SQL query
DBMS_LOB.CREATETEMPORARY(c,TRUE);
n:=1;
-- << loop_through_blob >>
WHILE (n+32767<=LENGTH(b)) LOOP
DBMS_LOB.WRITEAPPEND(c,32767,UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(b,32767,n)));
n:=n+32767;
END LOOP;
DBMS_LOB.WRITEAPPEND(c,length(b)-n+1,UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(b,length(b)-n+1,n)));
-- Execute explain plan
execute immediate 'EXPLAIN PLAN SET STATEMENT_ID=''temp1'' FOR ' || c;
-- Look at the result of the explain plan, and get all the lines of OBJECT_TYPE='TABLE'
-- << loop_through_plan >>
FOR p IN ( SELECT OBJECT_NAME FROM PLAN_TABLE WHERE STATEMENT_ID='temp1' AND OBJECT_TYPE='TABLE') LOOP
DBMS_OUTPUT.PUT_LINE(o.lbl || ', ' || p.OBJECT_NAME);
END LOOP;
execute immediate 'DELETE FROM PLAN_TABLE WHERE STATEMENT_ID=''temp1'' ';
END LOOP;
DBMS_OUTPUT.PUT_LINE('-- Completed --');
END;