oracle性能问题如何定位
最近甲方抱怨，oracle 怎么越跑越慢，感觉没有做什么。
1.先整体看看 awr
哎，没有什么大问题。
2.再看看等待事件 ，读写数据量有点大，网络带宽是不是也有点问题？
unicomidmp@UNICOM>select * from (select event,total_waits,time_waited from v$system_event where wait_class!='Idle' order by 2 desc)
where rownum<=5; 2
EVENT TOTAL_WAITS TIME_WAITED
---------------------------------------- ----------- -----------
SQL*Net message to client 558958155 280641
direct path write 17125518 60928
direct path read temp 15348717 94114
CGS wait for IPC msg 12819270 34251
row cache process 3955634 2093
unicomidmp@UNICOM>3.再看看数据库中大于6s的所有操作 ，BIN$MqiYSgwmm1ngU8gcZAr/JQ==$0有点多， 是不是drop table 没有purge？ 而且程序还在跑？
SQL> select opname,target,sql_hash_value,count(*) from v$session_longops group by opname,target,sql_hash_value;
OPNAME TARGET SQL_HASH_VALUE COUNT(*)
---------------------------------------------------------------- ---------------------------------------------------------------- -------------- ----------
Table Scan UNICOMIDMP.S_CONF_UTRANCELL_LATEST 39128036 2
Table Scan UNICOMIDMP.USER_TERMINAL_INFO_PURED 3215935786 3
Table Scan UNICOMIDMP.S_CONF_UTRANCELL_LATEST 2796354940 1
Table Scan UNICOMIDMP.BIN$MqiYSgwmm1ngU8gcZAr/JQ==$0 884600104 1
Table Scan UNICOMIDMP.BIN$Mp2OEx6spxngU8gcZAqrJQ==$0 19670268 1
Table Scan UNICOMIDMP.BIN$Ms+JSeUhN/XgU8gcZAr6Ig==$0 1268972253 1
Table Scan UNICOMIDMP.USER_TERMINAL_INFO_PURED_FLAG 2830050620 1
SYS_EXPORT_SCHEMA_01 2610655817 1
Table Scan UNICOMIDMP.BIN$Ms+JSeUtN/XgU8gcZAr6Ig==$0 1777384970 1
Table Scan UNICOMIDMP.USER_TMP_POINT_IMEI_LABEL 850788924 1
Table Scan UNICOMIDMP.S_CONF_CELL_LATEST 752358244 1
Table Scan UNICOMIDMP.S_CONF_UTRANCELL_LATEST 3018082299 3
Table Scan UNICOMIDMP.S_CONF_ETRANCELL_LATEST 599191390 1
Table Scan UNICOMIDMP.S_CONF_ETRANCELL_LATEST 1556111901 1
Table Scan UNICOMIDMP.USER_TERMINAL_INFO_PURED 3785492571 1
Table Scan UNICOMIDMP.BIN$Ms+JSeUhN/XgU8gcZAr6Ig==$0 3368282903 1
Table Scan UNICOMIDMP.BIN$Ms+JSeUtN/XgU8gcZAr6Ig==$0 920334701 1
Table Scan UNICOMIDMP.S_CONF_UTRANCELL_LATEST 1464500089 1
Table Scan UNICOMIDMP.S_CONF_UTRANCELL_LATEST 3362048161 1
Table Scan UNICOMIDMP.BIN$Mpvl7k/gUqzgU8gcZArNLA==$0 3883942665 1
OPNAME TARGET SQL_HASH_VALUE COUNT(*)
---------------------------------------------------------------- ---------------------------------------------------------------- -------------- ----------
Table Scan UNICOMIDMP.S_CONF_ETRANCELL_LATEST 1542225309 1
Table Scan UNICOMIDMP.USER_DAY_LOCATION 10387713 1
Table Scan UNICOMIDMP.S_CONF_UTRANCELL_LATEST 4167064535 36
Table Scan MENGL.TEST_TAB 3346715350 1
Table Scan UNICOMIDMP.BIN$MqiYSgwsm1ngU8gcZAr/JQ==$0 884600104 1
Table Scan UNICOMIDMP.USER_TERMINAL_INFO_PURED 232981614 1
Table Scan UNICOMIDMP.BIN$Ms+JSeUhN/XgU8gcZAr6Ig==$0 1904945350 1--4.看看表有多大。
unicomidmp@UNICOM>select count(*) from USER_TMP_POINT_IMEI_LABEL;
COUNT(*)
----------
59310705
unicomidmp@UNICOM>unicomidmp@UNICOM>select * from user_tab_partitions where table_name ='USER_TMP_POINT_IMEI_LABEL';
no rows selected
unicomidmp@UNICOM>select * from user_ind_columns where table_name='USER_TMP_POINT_IMEI_LABEL';
no rows selected
unicomidmp@UNICOM>--5..通过sql_hash_value ,定位到sql 看看，怎么回事。
unicomidmp@UNICOM>select sql_text from v$sqltext where hash_value=3215935786 order by address,piece;
SQL_TEXT
----------------------------------------------------------------
CREATE TABLE user_terminal_info_pured_flag AS SELECT month,
imsi, CASE WHEN net_type = '3G' THEN 1 WHEN net
_type = '2G' THEN 0 END AS net_type, sex, termi
nal_brand, terminal_model, CASE WHEN age_range = '??'
THEN 0 WHEN age_range = '17???' THEN 1 WHEN
age_range = '18-22' THEN 2 WHEN age_range = '23-25' TH
EN 3 WHEN age_range = '26-29' THEN 4 WHEN age_
range = '30-39' THEN 5 WHEN age_range = '40-49' THEN 6
WHEN age_range = '50-59' THEN 7 WHEN age_range
= '60??' THEN 8 END AS age, CASE WHEN arpu_range
= '0-49' THEN 1 WHEN arpu_range = '50-99' THEN 2
WHEN arpu_range = '100-149' THEN 3 WHEN arpu_range
= '150-199' THEN 4 WHEN arpu_range = '200-249' THEN 5
WHEN arpu_range = '250-299' THEN 6 WHEN arpu_ra
nge = '300???' THEN 7 END AS arpu, CASE WHEN tra
ffic_usage = '0-499' THEN 1 WHEN traffic_usage = '500-9
99' THEN 2 WHEN traffic_usage = '1000-1499' THEN 3
WHEN traffic_usage = '1500-1999' THEN 4 WHEN traff
ic_usage = '2000-2499' THEN 5 WHEN traffic_usage = '250
0-2999' THEN 6 WHEN traffic_usage = '3000-3499' THEN 7
WHEN traffic_usage = '3500-3999' THEN 8 WHEN t
raffic_usage = '4000-4499' THEN 9 WHEN traffic_usage =
'4500-4999' THEN 10 WHEN traffic_usage = '5000??' THE
N 11 END AS traffic, CASE WHEN voice_lens >= 0 AND
voice_lens < 120 THEN 1 WHEN voice_lens >= 120 AND voic
e_lens < 240 THEN 2 WHEN voice_lens >= 240 AND voice_le
ns < 360 THEN 3 WHEN voice_lens >= 360 AND voice_lens <
480 THEN 4 WHEN voice_lens >= 480 AND voice_lens < 600
THEN 5 WHEN voice_lens >= 600 AND voice_lens < 720 THE
N 6 WHEN voice_lens >= 720 AND voice_lens < 840 THEN 7
WHEN voice_lens >= 840 AND voice_lens < 960 THEN 8
WHEN voice_lens >= 960 AND voice_lens < 1080 THEN 9
WHEN voice_lens >= 1080 AND voice_lens < 1200 THEN 10
WHEN voice_lens >= 1200 THEN 11 END AS voice, CASE
WHEN sms_num >= 0 AND sms_num < 20 THEN 1 WHEN sms_num
>= 20 AND sms_num < 40 THEN 2 WHEN sms_num >= 40 AND s
ms_num < 60 THEN 3 WHEN sms_num >= 60 AND sms_num < 80
THEN 4 WHEN sms_num >= 80 AND sms_num < 100 THEN 5
WHEN sms_num >= 100 AND sms_num < 120 THEN 6 WHEN
sms_num >= 120 AND sms_num < 140 THEN 7 WHEN sms_num >=
140 AND sms_num < 160 THEN 8 WHEN sms_num >= 160 AND s
ms_num < 180 THEN 9 WHEN sms_num >= 180 AND sms_num < 2
00 THEN 10 WHEN sms_num >= 200 THEN 11 END AS
sms FROM user_terminal_info_pured
44 rows selected.
unicomidmp@UNICOM>结果是一个单表的转换过程， 这个完全可以用视图代替，没有必要再生成一个实体表。 这样增加了读写量。
---依次类推， 我们这里还有很多条sql， 每条都拿出来分析，修改设计。 避免性能产生。
补充结构：
V$SESSION_LONGOPS列说明
SID：Session标识
SERIAL#：Session串号
OPNAME：操作简要说明
TARGET：操作运行所在的对象
TARGET_DESC：目标对象说明
SOFAR：至今为止完成的工作量
TOTALWORK：总工作量
UNITS：工作量单位
START_TIME：操作开始时间
LAST_UPDATE_TIME：统计项最后更新时间
TIME_REMAINING：预计完成操作的剩余时间(秒)
ELAPSED_SECONDS：从操作开始总花费时间(秒)
CONTEXT：前后关系
MESSAGE：统计项的完整描述
USERNAME：执行操作的用户ID
SQL_ADDRESS：用于连接查询的列
SQL_HASH_VALUE：用于连接查询的列
QCSID：-------------
by mengl
2016.5.19 end