转自Qhttp://blog.csdn.net/chenjuntj2007/archive/2009/07/04/4321640.aspx
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---------- ---------- ----------
SQL> select exp(sum(ln(nid))) from t1 where v1='aa';
EXP(SUM(LN(NID)))
-----------------
已用旉:
验证一?)
SQL> select 61*62*64 from dual;
----------
已用旉:
先分l然后求U?font face="宋体">
SQL> select exp(sum(ln(nid))) from t1 group by v1;
EXP(SUM(LN(NID)))
-----------------
oracle q东东挺有意?
转自:http://blog.sina.com.cn/s/blog_54eeb5d901000ae5.html
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权限1,权限2,…权限n代表select,insert,update,delete,create,drop,index,alter,grant,references,reload,shutdown,process,file{?4个权限?br>当权?,权限2,…权限n被all privileges或者all代替Q表C予用户全部权限?br>当数据库名称.表名U被*.*代替Q表C予用h作服务器上所有数据库所有表的权限?br>用户地址可以是localhostQ也可以是ip地址、机器名字、域名。也可以?#8217;%'表示从Q何地址q接?br>‘q接口o’不能为空Q否则创建失败?br>
例如Q?br>mysql>grant select,insert,update,delete,create,drop on vtdc.employee to joe@10.163.225.87 identified by ‘123′;
l来?0.163.225.87的用户joe分配可对数据库vtdc的employee表进行select,insert,update,delete,create,drop{操作的权限Qƈ讑֮口o?23?br>
mysql>grant all privileges on vtdc.* to joe@10.163.225.87 identified by ‘123′;
l来?0.163.225.87的用户joe分配可对数据库vtdc所有表q行所有操作的权限Qƈ讑֮口o?23?br>
mysql>grant all privileges on *.* to joe@10.163.225.87 identified by ‘123′;
l来?0.163.225.87的用户joe分配可对所有数据库的所有表q行所有操作的权限Qƈ讑֮口o?23?br>
mysql>grant all privileges on *.* to joe@localhost identified by ‘123′;
l本机用户joe分配可对所有数据库的所有表q行所有操作的权限Qƈ讑֮口o?23?
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from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
2、查看表I间物理文g的名U及大小
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
3、查看回滚段名称及大?
select segment_name, tablespace_name, r.status,
(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
max_extents, v.curext CurExtent
From dba_rollback_segs r, v$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name ;
4、查看控制文?
select name from v$controlfile;
5、查看日志文?
select member from v$logfile;
6、查看表I间的用情?
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
7、查看数据库库对?
select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
8、查看数据库的版本
Select version FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)='Oracle';
9、查看数据库的创建日期和归档方式
Select Created, Log_Mode, Log_Mode From V$Database;
10、捕捉运行很久的SQL
column username format a12
column opname format a16
column progress format a8
select username,sid,opname,
round(sofar*100 / totalwork,0) || '%' as progress,
time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining <> 0
and sql_address = address
and sql_hash_value = hash_value
/
11、查看数据表的参C?
SELECT partition_name, high_value, high_value_length, tablespace_name,
pct_free, pct_used, ini_trans, max_trans, initial_extent,
next_extent, min_extent, max_extent, pct_increase, FREELISTS,
freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
last_analyzed
FROM dba_tab_partitions
--WHERE table_name = :tname AND table_owner = :towner
ORDER BY partition_position
12、查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
13、查找object为哪些进E所?
select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), 'Action Code #' || to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$session s, v$access a, v$process p
where s.paddr = p.addr and
s.type = 'USER' and
a.sid = s.sid and
a.object='SUBSCRIBER_ATTR'
order by s.username, s.osuser
14、回滚段查看
select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extents
Extents, v$rollstat.rssize Size_in_Bytes, v$rollstat.xacts XActs,
v$rollstat.gets Gets, v$rollstat.waits Waits, v$rollstat.writes Writes,
sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,
v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and
v$rollstat.usn (+) = v$rollname.usn order by rownum
15、耗资源的q程Qtop sessionQ?
select s.schemaname schema_name, decode(sign(48 - command), 1,
to_char(command), 'Action Code #' || to_char(command) ) action, status
session_status, s.osuser os_user_name, s.sid, p.spid , s.serial# serial_num,
nvl(s.username, '[Oracle process]') user_name, s.terminal terminal,
s.program program, st.value criteria_value from v$sesstat st, v$session s , v$process p
where st.sid = s.sid and st.statistic# = to_number('38') and ('ALL' = 'ALL'
or s.status = 'ALL') and p.addr = s.paddr order by st.value desc, p.spid asc, s.username asc, s.osuser asc
16、查看锁QlockQ情?
select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, 'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock', 'TX',
'Transaction enqueue lock', 'UL', 'User supplied lock') lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, 'Row Share', 3,
'Row Exclusive', 4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive', null)
lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2
from sys.dba_objects o, ( select s.osuser, s.username, l.type,
l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s,
v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner
<> 'SYS' order by o.owner, o.object_name
17、查看等待（waitQ情?
SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value
FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN ('db block gets',
'consistent gets') group by v$waitstat.class, v$waitstat.count
18、查看sga情况
SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC
19、查看catched object
SELECT owner, name, db_link, namespace,
type, sharable_mem, loads, executions,
locks, pins, kept FROM v$db_object_cache
20、查看V$SQLAREA
SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,
VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,
USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS, DISK_READS,
BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA
21、查看object分类数量
select decode (o.type#,1,'INDEX' , 2,'TABLE' , 3 , 'CLUSTER' , 4, 'VIEW' , 5 ,
'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) object_type , count(*) quantity from
sys.obj$ o where o.type# > 1 group by decode (o.type#,1,'INDEX' , 2,'TABLE' , 3
, 'CLUSTER' , 4, 'VIEW' , 5 , 'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) union select
'COLUMN' , count(*) from sys.col$ union select 'DB LINK' , count(*) from
22、按用户查看objectU类
select u.name schema, sum(decode(o.type#, 1, 1, NULL)) indexes,
sum(decode(o.type#, 2, 1, NULL)) tables, sum(decode(o.type#, 3, 1, NULL))
clusters, sum(decode(o.type#, 4, 1, NULL)) views, sum(decode(o.type#, 5, 1,
NULL)) synonyms, sum(decode(o.type#, 6, 1, NULL)) sequences,
sum(decode(o.type#, 1, NULL, 2, NULL, 3, NULL, 4, NULL, 5, NULL, 6, NULL, 1))
others from sys.obj$ o, sys.user$ u where o.type# >= 1 and u.user# =
o.owner# and u.name <> 'PUBLIC' group by u.name order by
sys.link$ union select 'CONSTRAINT' , count(*) from sys.con$
23、有关connection的相关信?
1Q查看有哪些用户q接
select s.osuser os_user_name, decode(sign(48 - command), 1, to_char(command),
'Action Code #' || to_char(command) ) action, p.program oracle_process,
status session_status, s.terminal terminal, s.program program,
s.username user_name, s.fixed_table_sequence activity_meter, '' query,
0 memory, 0 max_memory, 0 cpu_usage, s.sid, s.serial# serial_num
from v$session s, v$process p where s.paddr=p.addr and s.type = 'USER'
order by s.username, s.osuser
2Q根据v.sid查看对应q接的资源占用等情况
select n.name,
v.value,
n.class,
n.statistic#
from v$statname n,
v$sesstat v
where v.sid = 71 and
v.statistic# = n.statistic#
order by n.class, n.statistic#
3Q根据sid查看对应q接正在q行的sql
select /*+ PUSH_SUBQ */
command_type,
sql_text,
sharable_mem,
persistent_mem,
runtime_mem,
sorts,
version_count,
loaded_versions,
open_versions,
users_opening,
executions,
users_executing,
loads,
first_load_time,
invalidations,
parse_calls,
disk_reads,
buffer_gets,
rows_processed,
sysdate start_time,
sysdate finish_time,
'>' || address sql_address,
'N' status
from v$sqlarea
where address = (select sql_address from v$session where sid = 71)
24、查询表I间使用情况select a.tablespace_name "表空间名U?,
100-round((nvl(b.bytes_free,0)/a.bytes_alloc)*100,2) "占用?%)",
round(a.bytes_alloc/1024/1024,2) "定w(M)",
round(nvl(b.bytes_free,0)/1024/1024,2) "I闲(M)",
round((a.bytes_alloc-nvl(b.bytes_free,0))/1024/1024,2) "使用(M)",
Largest "最大扩展段(M)",
to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') "采样旉"
from (select f.tablespace_name,
sum(f.bytes) bytes_alloc,
sum(decode(f.autoextensible,'YES',f.maxbytes,'NO',f.bytes)) maxbytes
from dba_data_files f
group by tablespace_name) a,
(select f.tablespace_name,
sum(f.bytes) bytes_free
from dba_free_space f
group by tablespace_name) b,
(select round(max(ff.length)*16/1024,2) Largest,
ts.name tablespace_name
from sys.fet$ ff, sys.file$ tf,sys.ts$ ts
where ts.ts#=ff.ts# and ff.file#=tf.relfile# and ts.ts#=tf.ts#
group by ts.name, tf.blocks) c
where a.tablespace_name = b.tablespace_name and a.tablespace_name = c.tablespace_name
25?查询表空间的片E度
select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name
having count(tablespace_name)>10;
alter tablespace name coalesce;
alter table name deallocate unused;
create or replace view ts_blocks_v as
select tablespace_name,block_id,bytes,blocks,'free space' segment_name from dba_free_space
union all
select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents;
select * from ts_blocks_v;
select tablespace_name,sum(bytes),max(bytes),count(block_id) from dba_free_space
group by tablespace_name;
]]>
datalength(Char_expr)q回字符串包含字W数,但不包含后面的空?br>substring(expression,start,length)不多说了,取子?br>right(char_expr,int_expr)q回字符串右边int_expr个字W?/p>
字符操作c?br>upper(char_expr)转ؓ大写
lower(char_expr)转ؓ写
space(int_expr)生成int_expr个空?br>replicate(char_expr,int_expr)复制字符串int_expr?br>reverse(char_expr)反{字符?br>stuff(char_expr1,start,length,char_expr2)字W串char_expr1中的从start开始的length个字W用char_expr2代替
ltrim(char_expr)rtrim(char_expr)取掉I格
ascii(char)char(ascii)两函数对?取ascii?Ҏascii吗取字符
字符串查?br>charindex(char_expr,expression)q回char_expr的v始位|?br>patindex("pattern",expression)q回指定模式的v始位|?否则?
2.数学函数
abs(numeric_expr)求绝对?br>ceiling(numeric_expr)取大于等于指定值的最整?br>exp(float_expr)取指?br>floor(numeric_expr)于{于指定值得最大整?br>pi()3.1415926.........
power(numeric_expr,power)q回powerơ方
rand([int_expr])随机C生器
round(numeric_expr,int_expr)安int_expr规定的精度四舍五?br>sign(int_expr)Ҏ正数,0,负数,,q回 1,0,-1
sqrt(float_expr)qx?/p>
3.日期函数
getdate()q回日期
datename(datepart,date_expr)q回名称如June
datepart(datepart,date_expr)取日期一部䆾
datediff(datepart,date_expr1.dateexpr2)日期?br>dateadd(datepart,number,date_expr)q回日期加上number
上述函数中datepart?br>写法取值和意义
yy1753-9999q䆾
qq1-4?br>mm1-12?br>dy1-366?br>dd1-31?br>wk1-54?br>dw1-7周几
hh0-23时
mi0-59分钟
ss0-59U?br>ms0-999毫秒
日期转换
convert()
4.pȝ函数
suser_name()用户d?br>user_name()用户在数据库中的名字
user用户在数据库中的名字
show_role()对当前用戯v作用的规?br>db_name()数据库名
object_name(obj_id)数据库对象名
col_name(obj_id,col_id)列名
col_length(objname,colname)列长?br>valid_name(char_expr)是否是有效标识符
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