How to limit the number of search results returned by oracle text

Hello All,
I am running an oracle text search which returned the following error to my java program.
ORA-20000: Oracle Text error:
DRG-51030: wildcard query expansion resulted in too many terms
#### ORA-29902: Fehler bei der AusfÃ¼hrung von Routine ODCIIndexStart()
ORA-20000: Oracle Text error:
DRG-51030: wildcard query expansion resulted in too many terms
java.sql.SQLException: ORA-29902: Fehler bei der AusfÃ¼hrung von Routine ODCIIndexStart()
ORA-20000: Oracle Text error:
DRG-51030: wildcard query expansion resulted in too many terms
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:169)
When i looked up the net, one suggestion that was given is to narrow the wildcard query, which i cannot in my search page. Hence I am left with the only alternative of limiting the number of results returned by oracle text search query.
Please let me know how to limit the number of search results returned by oracle text so that this error can be avoided.
Thanks in advance
krk

Hi,
If not set explicitly, the default value for WILDCARD_MAXTERMS is 5000. This is set as a wordlist preference. This means that if your wildcard query matches more than 5000 terms the message is returned. Exceeding that would give the user a lot to sift through.
My suggestion: trap the error and return a meaningful message to the user indicating that the search needs to be refined. Although it is possible to increase the number of terms before hitting maxterms (increase wildcard_maxterms preference value for your wordlist), 5000 records is generally too much for a user to deal with anyway. The search is not a good one since it is not restricting rows adequately. If it happens frequently, get the query log and see the terms that are being searched that generate this message. It may be necessary to add one or more words to a stoplist if they are too generic.
Example: The word mortgage might be a great search term for a local business directory. It might be a terrible search term for a national directory of mortgage lenders though (since 99% of them have the term in their name). In the case of the national directory, that term would be a candidate for inclusion in the stoplist.
Also remember that full terms do not need a wildcard. Search for "car %" is not necessary and will give you the error you mentioned. A search for "car" will yield the results you need even if it is only part of a bigger sentence because everything is based on the token. You may already know all of this, but without an example query I figured I'd mention it to be sure.
As for limiting the results - the best way to do that is to allow the user to limit the results through their query. This will ensure accurate and more meaningful results for them.
-Ron

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