rebuilding pg_xlog from base files

Hi! We have a java program accessing a postgresql 7.1.3 db through a connection pool. this morning when i checked the db, a number of recent records were missing. however, when i did a search on the pgdata/base files, the recent records were still there and also in the pg_xlog file but i can't see them using psql. Is there a way to fix this like rebuilding the pg_xlog perhaps?

Thanks.

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