Request for explanation of BUFFER_SORT

Hi,
When execute my SQL query for explain plan in TOAD, i'm getting BUFFER_SORT,i don't understand why it coming,Can any give the explanation about this & how to overcome this problem
There are 2 lacs records in that table & also indexes are there.But still Full table scanning occuring.
Please give the suggestions what to do..
Operation     Object Name     Rows     Bytes     Cost     Object Node     In/Out     PStart     PStop
SELECT STATEMENT Optimizer Mode=ALL_ROWS          1 K          3347
BUFFER SORT          4 K     149 K     395
TABLE ACCESS FULL     MAXIMO.RELATEDRECORD     4 K     149 K     392
TABLE ACCESS FULL     MAXIMO.WORKORDER     229 K     26 M     2922           TABLE ACCESS BY INDEX ROWID     MAXIMO.TICKET     1      778      1
INDEX UNIQUE SCAN     MAXIMO.TICKET_NDX1     1           0
Regards,
GR.

Rule No. 1: Full table scan != bad
Rule No. 2: Full table scan != good
Rule No. 3: Index access != good
Rule No. 4: Index access != bad
You have not posted your query or execution plan so we have no idea of the source of your concern.
Why do you think a buffer sort is a bad thing?
How long does the query take to execute? How long should it take to execute? How do you know that is a reasonable expectation?

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_What requirements do I need to satisfy to take part in the Upgrade Program?_
+To take part in the Upgrade Program, you must satisfy the following three criteria:+
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Request for explanation of BUFFER_SORT

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