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Problems after using DBMS_STATS with GATHER AUTO

My reports are not working after I used DBMS_STATS with GATHER AUTO in the SCHEMA level. My database is Oracle 9i rel2 and Optimizer_mode=CHOOSE.

My reports are not working after I used DBMS_STATS with GATHER AUTO in the SCHEMA level. My database is Oracle 9i rel2 and Optimizer_mode=CHOOSE. Please give me a solution. Thanks in advance.
Experiment with different options to DBMS_STATS. After each round of statistics gathering, trace your report and observe the execution plans.

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