sql优化 - Oracle / 高级技术

有这样一个查询语句
Select to_char(RSN) RSN,
  to_char(SID) SID,
  to_char(OID) OID,
  PDID,
  PRID,
  to_char(GSID) GSID,
  to_char(RGSID) RGSID,
  to_char(PPOID) PPOID,
  VERSION,
  STARTDATE,
  to_char(APOID) APOID,
  APTP,
  ENDDATE,
  to_char(COID) COID,
  OLDENDDATE,
  to_char(IU) IU,
  VERSION,
  to_char(SPID) SPID,
  to_char(RFID) RFID,
  to_char(RLID) RLID,
  PRSNT,
  OBDL
  from T_PO_BB
 Where SID = '123456'
  And RSN = 100
  And (STARTDATE < ENDDATE OR ENDDATE IS NULL)
  AND NVL(ENDDATE, SYSDATE + 1) > SYSDATE
 order by SPID ASC, PRID, STARTDATE;
 
 相应表有索引
 
 create index IDX_SID_B on T_PO_BB (SID)
 create unique index PK_OSN on T_PO_BB (OID, RSN)


在执行的时候CPU占用超过16％，需要优化，各位大侠看看，有何方案？

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自己顶一下。。

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一起等待。。。superman

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引用

有这样一个查询语句
Select to_char(RSN) RSN,
to_char(SID) SID,
to_char(OID) OID,
PDID,
PRID,
to_char(GSID)