backup error 自动备份错误

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CTCNSLF 2015/09/10 EXP-00056: ORACLE error 1555 encountered ORA-01555: snapshot too old: rollback segment number 11 with name "_SYSSMU11$" too small EXP-00000: Export terminated unsuccessfully *****（快照过旧）1.增大表空间 2.undo保留时间 3.改变SQL执行效率 *****select begin_time,end_time,undoblks from v$undostat; 进程数 *****select max(undoblks / ((end_time - begin_time)*24*3600))  from v$undostat;进程中使用最多block块大小 *****SELECT (UR * (UPS * DBS))/1024/1024 AS "M"  FROM (select max(tuned_undoretention) AS UR from v$undostat),  (SELECT undoblks/((end_time-begin_time)*86400) AS UPS  FROM v$undostat  WHERE undoblks = (SELECT MAX(undoblks) FROM v$undostat)),  (SELECT block_size AS DBS  FROM dba_tablespaces  WHERE tablespace_name = (SELECT UPPER(value) FROM v$parameter WHERE name = 'undo_tablespace')); 查询所需的undo表空间的最大值
CTCNJCF 2015/09/11 [oracle@CTDBJCF01 CTCNJCF]$ cat CTCNJCF_110915.log | grep ORA
EXP-00056: ORACLE error 12161 encountered
ORA-12161: TNS:internal error: partial data received
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