Clob field issue

Hi ,
When i fetching the data from CLOB filed by using dbms_lob.substr, its throwing an error like Character string buffer too small
This is my sql select dbms_lob.substr(A.stagevar) FROM TB_JOBCOMP_DBS41 A WHERE A.jobname='AcctTransCurrentSequence'
*AND A.stagevar NOT LIKE '%Nil%' AND dbms_lob.substr(A.stagevar) <> '[ No Stage Variables ]'*
Can any one help me to solve this issue

You are pulling back too many characters from the CLOB and overflowing the string buffer.
I noticed that you didn't specify a limit in dbms_lob.substr. I didn't think you could even do that. Try using this code instead: dbms_lob.substr(A.stagevar,4000). (It looks like you'll have to replace this twice in your query.)
FYI, string length limits are 4000 in SQL and 32767 in PL/SQL.

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