oracle 如何计算中英文混合字符串占用的字节

1.生成跟踪文件
alter session set timed_statistics=true;
alter session set events '10046 trace name context forever,level 12';
Session altered.
Session altered.

2.获得跟踪文件名

select rtrim(c.value,'/')||'/'||d.instance_name||'_ora_'||ltrim(to_char(a.spid))||'.trc'
from v$process a,v$session b,v$parameter c,v$instance d
where a.addr=b.paddr
and b.audsid=sys_context('userenv','sessionid')
and c.name='user_dump_dest';

RTRIM(C.VALUE,'/')||'/'||D.INSTANCE_NAME||'_ORA_'||LTRIM(TO_CHAR(A.SPID))||'.TRC
--------------------------------------------------------------------------------
/home/oracle/admin/ora10/udump/ora10_ora_18864.trc

3.创建TKPROF报告
tkprof /home/oracle/admin/ora10/udump/ora10_ora_16424.trc /tmp/t.txt

注意 /home/oracle/admin/ora10/udump/ora10_ora_16424.trc 这个文件只能是
ORACLE 用户才能读出

4.读报告
vi /tmp/t.txt

---运行程序

selectcount(*)

from

t

查询和执行统计

执行次数CPU时间量占用时间磁盘IO查询当前行

call调用countcpuelapseddiskquerycurrentrows

-----------------------------------------------------------------------

Parse分析10.000.000000

Execute执行10.000.000000

Fetch提取20.041.6368970801

-----------------------------------------------------------------------

total合计40.041.6468970801

Missesinlibrarycacheduringparse:1高速缓冲错误1

Optimizermode:ALL_ROWS优化方式

Parsinguserid:54分析用户ID

RowsRowSourceOperation

----------------------------------------------------------

cr为一致方式读取，显示一致读取数(逻辑I/O)pr是物理读取pw为物理写入time=(以百万分之一秒计占用时间)

1SORTAGGREGATE(cr=708pr=689pw=0time=1638784us)

51018TABLEACCESSFULLT(cr=708pr=689pw=0time=765387us)

等候时间

Elapsedtimesincludewaitingonfollowingevents:

EventwaitedonTimesMax.WaitTotalWaited

----------------------------------------Waited----------------------

SQL*Netmessagetoclient20.000.00

dbfilescatteredread510.071.60

SQL*Netmessagefromclient20.000.00

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