OracleE语句的执行时间需要使用 SET TIMING ON，例如：
[oracle@jw ~]$ sqlplus "/as sysdba" SQL*Plus: Release 9.2.0.4.0 - Production on 星期二 8月 28 16:59:43 2007 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
连接到:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production With the Partitioning, Oracle Label Security, OLAP and Oracle Data Mining options JServer Release 9.2.0.4.0 - Production SQL> set timing on; SQL> select count(*) from tab; COUNT(*) ---------- 2447 已用时间: 00: 00: 00.12 SQL>
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