科技资讯眺望|Oracle常用命令大全( 七 ) 1.createuserusernameidentifiedbypass

SELECT name, gets, misses, immediate_gets, immediate_misses,
Decode(gets,0,0,misses/gets*100) ratio1,
Decode(immediate_gets+immediate_misses,0,0,
immediate_misses/(immediate_gets+immediate_misses) *100) ratio2
FROM v$latch WHERE name IN ('redo allocation', 'redo copy');
155. 监控内存和硬盘的排序比率，最好使它小于 .10，增加 sort_area_size
SELECT name, value FROM v$sysstat WHERE name IN ('sorts (memory)', 'sorts
(disk)');
156. 如何监控当前数据库谁在运行什么 SQL 语句？
SELECT osuser, username, sql_text from v$session a, v$sqltext b
where a.sql_address =b.address order by address, piece;
157. 如何监控字典缓冲区？
SELECT (SUM(PINS - RELOADS)) / SUM(PINS) "LIB CACHE" FROM
V$LIBRARYCACHE;
SELECT (SUM(GETS - GETMISSES - USAGE - FIXED)) / SUM(GETS) "ROW CACHE"
FROM
V$ROWCACHE;
SELECT SUM(PINS) "EXECUTIONS", SUM(RELOADS) "CACHE MISSES WHILE
EXECUTING" FROM
V$LIBRARYCACHE;
后者除以前者 , 此比率小于 1%, 接近 0% 为好。
SELECT SUM(GETS) "DICTIONARY GETS",SUM(GETMISSES) "DICTIONARY CACHE
GET MISSES"
FROM V$ROWCACHE
158. 监控 MTS
select busy/(busy+idle) "shared servers busy" from v$dispatcher;
此值大于 0.5 时，参数需加大
select sum(wait)/sum(totalq) "dispatcher waits" from v$queue where
type='dispatcher';
select count(*) from v$dispatcher;
select servers_highwater from v$mts;
servers_highwater 接近 mts_max_servers 时，参数需加大
159. 如何知道当前用户的 ID 号 ?
SQL>SHOW USER;
OR
SQL>select user from dual;
160. 如何查看碎片程度高的表 ?
SELECT segment_name table_name , COUNT(*) extents
FROM dba_segments WHERE owner NOT IN ('SYS', 'SYSTEM') GROUP BY
segment_name
HAVING COUNT(*) = (SELECT MAX( COUNT(*) ) FROM dba_segments GROUP BY
segment_name);
162. 如何知道表在表空间中的存储情况 ?
select segment_name,sum(bytes),count(*) ext_quan from dba_extents where
tablespace_name='
163. 如何知道索引在表空间中的存储情况 ?
select segment_name,count(*) from dba_extents where segment_type='INDEX' and
owner='
164 、如何知道使用 CPU 多的用户 session?
11 是 cpu used by this session
select a.sid,spid,status,substr(a.program,1,40)
prog,a.terminal,osuser,value/60/100 value
from v$session a,v$process b,v$sesstat c
where c.statistic#=11 and c.sid=a.sid and a.paddr=b.addr order by value desc;
165. 如何知道监听器日志文件 ?
以 8I 为例
$ORACLE_HOME/NETWORK/LOG/LISTENER.LOG
166. 如何知道监听器参数文件 ?
以 8I 为例
$ORACLE_HOME/NETWORK/ADMIN/LISTENER.ORA
167. 如何知道 TNS 连接文件 ?
以 8I 为例
$ORACLE_HOME/NETWORK/ADMIN/TNSNAMES.ORA
168. 如何知道 Sql*Net 环境文件 ?
以 8I 为例
$ORACLE_HOME/NETWORK/ADMIN/SQLNET.ORA
169. 如何知道警告日志文件 ?
以 8I 为例
$ORACLE_HOME/ADMIN/SID/BDUMP/SIDALRT.LOG
170. 如何知道基本结构 ?
以 8I 为例
$ORACLE_HOME/RDBMS/ADMIN/STANDARD.SQL
171. 如何知道建立数据字典视图 ?
以 8I 为例