科技资讯眺望|Oracle常用命令大全( 六 ) 1.createuserusernameidentifiedbypass

向回滚段表空间添加文件或使已有的文件变大；增加 MAXEXTENTS 的值。
144. 如何加密 ORACLE 的存储过程？
下列存储过程内容放在 AA.SQL 文件中
create or replace procedure testCCB(i in number) as
begin
dbms_output.put_line(' 输入参数是 '||to_char(i));
end;
SQL>wrap iname=a.sql;
PL/SQL Wrapper: Release 8.1.7.0.0 - Production on Tue Nov 27 22:26:48 2001
Copyright (c) Oracle Corporation 1993, 2000. All Rights Reserved.
Processing AA.sql to AA.plb
运行 AA.plb
SQL> @AA.plb ;
145. 如何监控事例的等待？
select event,sum(decode(wait_Time,0,0,1)) "Prev",
sum(decode(wait_Time,0,1,0)) "Curr",count(*) "Tot"
from v$session_Wait
group by event order by 4;
146. 如何回滚段的争用情况？
select name, waits, gets, waits/gets "Ratio"
from v$rollstat C, v$rollname D
where C.usn = D.usn;
147. 如何监控表空间的 I/O 比例？
select B.tablespace_name name,B.file_name "file",A.phyrds pyr,
A.phyblkrd pbr,A.phywrts pyw, A.phyblkwrt pbw
from v$filestat A, dba_data_files B
where A.file# = B.file_id
order by B.tablespace_name;
148. 如何监控文件系统的 I/O 比例？
select substr(C.file#,1,2) "#", substr(C.name,1,30) "Name",
C.status, C.bytes, D.phyrds, D.phywrts
from v$datafile C, v$filestat D
where C.file# = D.file#;
149. 如何在某个用户下找所有的索引？
select user_indexes.table_name, user_indexes.index_name,uniqueness,
column_name
from user_ind_columns, user_indexes
where user_ind_columns.index_name = user_indexes.index_name
and user_ind_columns.table_name = user_indexes.table_name
order by user_indexes.table_type, user_indexes.table_name,
user_indexes.index_name, column_position;
150. 如何监控 SGA 的命中率？
select a.value + b.value "logical_reads", c.value "phys_reads",
round(100 * ((a.value+b.value)-c.value) / (a.value+b.value)) "BUFFER HIT RATIO"
from v$sysstat a, v$sysstat b, v$sysstat c
where a.statistic# = 38 and b.statistic# = 39
and c.statistic# = 40;
151. 如何监控 SGA 中字典缓冲区的命中率？
select parameter, gets,Getmisses , getmisses/(gets+getmisses)*100 "miss ratio",
(1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 "Hit ratio"
from v$rowcache
where gets+getmisses <>0
group by parameter, gets, getmisses;
152. 如何监控 SGA 中共享缓存区的命中率，应该小于 1% ？
select sum(pins) "Total Pins", sum(reloads) "Total Reloads",
sum(reloads)/sum(pins) *100 libcache
from v$librarycache;
select sum(pinhits-reloads)/sum(pins) "hit radio",sum(reloads)/sum(pins)
"reload
percent"
from v$librarycache;
153. 如何显示所有数据库对象的类别和大小？
select count(name) num_instances ,type ,sum(source_size) source_size ,
sum(parsed_size) parsed_size ,sum(code_size) code_size ,sum(error_size)
error_size,
sum(source_size) +sum(parsed_size) +sum(code_size) +sum(error_size)
size_required
from dba_object_size
group by type order by 2;
154. 监控 SGA 中重做日志缓存区的命中率，应该小于 1%