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fitzsu:
关于中文占多少字节的问题应该是跟字符集相关的,跟类型无关的对吗 ...
Oracle CHAR,VARCHAR,VARCHAR2,nvarchar类型的区别与使用 -
showzh:
...
Oracle CHAR,VARCHAR,VARCHAR2,nvarchar类型的区别与使用 -
ltian:
实话实说,让我云里雾里!不知道Hibernate缓存能力和云计 ...
OO + 分布式计算 = 软件架构的方向 -
蔡华江:
5.如果数据间引用不存在环路,还可以用递归查询来完成如果出现环 ...
一道数据库开发面试题 -
zydar:
自己不改~
springside3版本qWikiOffice
--查看表空间的名称及大小
--m
select t.tablespace_name, round(sum(bytes / (1024 * 1024)), 0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
--查看表空间物理文件的名称及大小
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
--查看回滚段名称及大小
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$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name ;
--查看控制文件
select name from v$controlfile;
--、查看日志文件
select member from v$logfile;
--查看表空间的使用情况
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$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;
--查看数据库库对象
select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
--、查看数据库的版本
Select version FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)='Oracle';
--、查看数据库的创建日期和归档方式
Select Created, Log_Mode, Log_Mode From V$Database;
--、捕捉运行很久的SQL
column username format a12
column opname format a16
column progress format a8
select username,sid,opname,
round(sofar*100 / totalwork,0) || '%' as progress,
time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining <> 0
and sql_address = address
and sql_hash_value = hash_value
/
--、查看数据表的参数信息
SELECT partition_name, high_value, high_value_length, tablespace_name,
pct_free, pct_used, ini_trans, max_trans, initial_extent,
next_extent, min_extent, max_extent, pct_increase, FREELISTS,
freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
last_analyzed
FROM dba_tab_partitions
--WHERE table_name = :tname AND table_owner = :towner
ORDER BY partition_position
--查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
--查找object为哪些进程所用
select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), 'Action Code #' || to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$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
--耗资源的进程(top session)
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$process p where st.sid = s.sid and st.statistic# = to_number('38') and ('ALL' = 'ALL' or s.status = 'ALL') and p.addr = s.paddr
order by st.value desc, p.spid asc, s.username asc, s.osuser asc;
查看锁(lock)情况
select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, ’RW’, ’Row wait enqueue lock’, ’TM’, ’DML enqueue lock’, ’TX’,
’Transaction enqueue lock’, ’UL’, ’User supplied lock’) lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, ’Row Share’, 3,
’Row Exclusive’, 4, ’Share’, 5, ’Share Row Exclusive’, 6, ’Exclusive’, null)
lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2
from sys.dba_objects o, ( select s.osuser, s.username, l.type,
l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s,
v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner
<> ’SYS’ order by o.owner, o.object_name
17、查看等待(wait)情况
SELECT v$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object种类
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的相关信息
1)查看有哪些用户连接
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
2)根据v.sid查看对应连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#
3)根据sid查看对应连接正在运行的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)
----、查询表空间使用情况
select a.tablespace_name "表空间名称",
100 - round((nvl(b.bytes_free, 0) / a.bytes_alloc) * 100, 2) "占用率(%)",
round(a.bytes_alloc / 1024 / 1024, 2) "容量(M)",
round(nvl(b.bytes_free, 0) / 1024 / 1024, 2) "空闲(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') "采样时间" 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;
--- 查询表空间的碎片程度
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;
---如何查看数据库中某用户,正在运行什么SQL语句?
SELECT SQL_TEXT FROM V$SQL_TEXT T, V$SESSION S WHERE T.ADDRESS=S.SQL_ADDRESS
AND T.HASH_VALUE=S.SQL_HASH_VALUE
AND S.MACHINE=’XXXXX’ OR USERNAME='XXXXX'
--(1) 查询oracle 的物理结构
--1.1. 查看数据文件
SQL> select name from v$datafile;
NAME
---------------------------------------------
/u05/dbf/PROD/system_01.dbf/u05/dbf/PROD/system_01.dbf (系统数据文件)
/u06/dbf/PROD/temp_01.dbf (临时数据文件)
/u04/dbf/PROD/users_01.dbf (用户数据文件)
/u09/dbf/PROD/rbs_01.dbf (回滚数据文件)
/u06/dbf/PROD/applsys_indx_01.dbf (索引数据文件)
数据文件是ORACLE中最重要的物理文件
--1.2.查询控制文件信息
SQL>select * from V$Controlfile
--1.3 查看日志组
SQL>select * from V$Log
--1.4. 查看具体的日志成员文件
SQL>select * from v$logfile
---1.5 通过以下SQL 找到 报警日至文件的路径
select value from v$parameter where name ='background_dump_dest'
--1.6 通过以下SQL找到用户跟踪文件的路径
select value from v$parameter where name ='user_dump_dest'
--(2) 查询安全信息
---2.1 显示示用户信息
SQL>selelct * from DBA_Users Where Username =’system’
--2.2 显示角色信息
SQL> Select *from Dba_Roles
--2.2 显示表空间限额的信息
SQL> select Tablespace_Name,Username,Bytes,max_bytes
SQL> from dba_ts_quotas;
--2.4 显示开工文件和相关资源限制设置的信息
SQL> Select profile,resource_name,limit
SQL> from Dba_profiles;
--2.5 显示当前用户拥有的所有的表
SQL> Select * From Tab;
--2.6 查看内部系统表的SQL
select * from v$fixed_view_definition
--3 查询oracle 的系统环境变量
--3.1.查找全局共享缓冲区(SGA)
SQL> select * from v$sga;
NAME VALUE
-------------------- ---------
Fixed Size 39816
Variable Size 259812784
Database Buffers 1.049E+09
Redo Buffers 327680
更详细的信息可以参考V$sgastat、V$buffer_pool
对于保存在共享池中的SQL语句,可以从V$Sqltext、v$Sqlarea中查询到
---3.2清空Share_pool,保留Data buffer
SQL> alter system flush SHARED_POOL;
System altered.
---3.3. .运行以下语句可以得到系统SCN号
SQL> select max(ktuxescnw * power(2, 32) + ktuxescnb) scn from x$ktuxe;
SCN
----------
31014
---3.4 查询数据块可用空间大小。
Select kvisval,kvistag,kvisdsc from sys.x$kvis;
--3.5检查当前oracle 的连接类型:
select server
from v$session
where audisid=USERENV(‘SESSIONID’);
如果 输出
SERVER
―――――――――――
DEDICATED
说明当前的oracle 连接实用的是专用服务器连接 ,而不是MTS多线程服务器(SHARED)
---3.6. 查看数据数据字典的SQL
select * from dict
---3.7检查后台线程的状态
Select name,Description
From V$BGPROCESS
Where Paddr<>’00’ (进程地址不等于’00’)
输出结果类似:
name description
-------- ---------------------------------
Pmon Process Cleanup
Dbwo db Writer Process 0
Lgwr Redo Etc
Ckpt checkpoint
。。。 。。。
---3.8 显示表结构
desc tablename(任意表名);
输出结果类似:
name null? Type
---------------------------- -------------------- ------------------
ID Not Null Number(30)
--m
select t.tablespace_name, round(sum(bytes / (1024 * 1024)), 0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
--查看表空间物理文件的名称及大小
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
--查看回滚段名称及大小
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$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name ;
--查看控制文件
select name from v$controlfile;
--、查看日志文件
select member from v$logfile;
--查看表空间的使用情况
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$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;
--查看数据库库对象
select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
--、查看数据库的版本
Select version FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)='Oracle';
--、查看数据库的创建日期和归档方式
Select Created, Log_Mode, Log_Mode From V$Database;
--、捕捉运行很久的SQL
column username format a12
column opname format a16
column progress format a8
select username,sid,opname,
round(sofar*100 / totalwork,0) || '%' as progress,
time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining <> 0
and sql_address = address
and sql_hash_value = hash_value
/
--、查看数据表的参数信息
SELECT partition_name, high_value, high_value_length, tablespace_name,
pct_free, pct_used, ini_trans, max_trans, initial_extent,
next_extent, min_extent, max_extent, pct_increase, FREELISTS,
freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
last_analyzed
FROM dba_tab_partitions
--WHERE table_name = :tname AND table_owner = :towner
ORDER BY partition_position
--查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
--查找object为哪些进程所用
select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), 'Action Code #' || to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$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
--耗资源的进程(top session)
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$process p where st.sid = s.sid and st.statistic# = to_number('38') and ('ALL' = 'ALL' or s.status = 'ALL') and p.addr = s.paddr
order by st.value desc, p.spid asc, s.username asc, s.osuser asc;
查看锁(lock)情况
select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, ’RW’, ’Row wait enqueue lock’, ’TM’, ’DML enqueue lock’, ’TX’,
’Transaction enqueue lock’, ’UL’, ’User supplied lock’) lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, ’Row Share’, 3,
’Row Exclusive’, 4, ’Share’, 5, ’Share Row Exclusive’, 6, ’Exclusive’, null)
lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2
from sys.dba_objects o, ( select s.osuser, s.username, l.type,
l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s,
v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner
<> ’SYS’ order by o.owner, o.object_name
17、查看等待(wait)情况
SELECT v$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object种类
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的相关信息
1)查看有哪些用户连接
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
2)根据v.sid查看对应连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#
3)根据sid查看对应连接正在运行的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)
----、查询表空间使用情况
select a.tablespace_name "表空间名称",
100 - round((nvl(b.bytes_free, 0) / a.bytes_alloc) * 100, 2) "占用率(%)",
round(a.bytes_alloc / 1024 / 1024, 2) "容量(M)",
round(nvl(b.bytes_free, 0) / 1024 / 1024, 2) "空闲(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') "采样时间" 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;
--- 查询表空间的碎片程度
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;
---如何查看数据库中某用户,正在运行什么SQL语句?
SELECT SQL_TEXT FROM V$SQL_TEXT T, V$SESSION S WHERE T.ADDRESS=S.SQL_ADDRESS
AND T.HASH_VALUE=S.SQL_HASH_VALUE
AND S.MACHINE=’XXXXX’ OR USERNAME='XXXXX'
--(1) 查询oracle 的物理结构
--1.1. 查看数据文件
SQL> select name from v$datafile;
NAME
---------------------------------------------
/u05/dbf/PROD/system_01.dbf/u05/dbf/PROD/system_01.dbf (系统数据文件)
/u06/dbf/PROD/temp_01.dbf (临时数据文件)
/u04/dbf/PROD/users_01.dbf (用户数据文件)
/u09/dbf/PROD/rbs_01.dbf (回滚数据文件)
/u06/dbf/PROD/applsys_indx_01.dbf (索引数据文件)
数据文件是ORACLE中最重要的物理文件
--1.2.查询控制文件信息
SQL>select * from V$Controlfile
--1.3 查看日志组
SQL>select * from V$Log
--1.4. 查看具体的日志成员文件
SQL>select * from v$logfile
---1.5 通过以下SQL 找到 报警日至文件的路径
select value from v$parameter where name ='background_dump_dest'
--1.6 通过以下SQL找到用户跟踪文件的路径
select value from v$parameter where name ='user_dump_dest'
--(2) 查询安全信息
---2.1 显示示用户信息
SQL>selelct * from DBA_Users Where Username =’system’
--2.2 显示角色信息
SQL> Select *from Dba_Roles
--2.2 显示表空间限额的信息
SQL> select Tablespace_Name,Username,Bytes,max_bytes
SQL> from dba_ts_quotas;
--2.4 显示开工文件和相关资源限制设置的信息
SQL> Select profile,resource_name,limit
SQL> from Dba_profiles;
--2.5 显示当前用户拥有的所有的表
SQL> Select * From Tab;
--2.6 查看内部系统表的SQL
select * from v$fixed_view_definition
--3 查询oracle 的系统环境变量
--3.1.查找全局共享缓冲区(SGA)
SQL> select * from v$sga;
NAME VALUE
-------------------- ---------
Fixed Size 39816
Variable Size 259812784
Database Buffers 1.049E+09
Redo Buffers 327680
更详细的信息可以参考V$sgastat、V$buffer_pool
对于保存在共享池中的SQL语句,可以从V$Sqltext、v$Sqlarea中查询到
---3.2清空Share_pool,保留Data buffer
SQL> alter system flush SHARED_POOL;
System altered.
---3.3. .运行以下语句可以得到系统SCN号
SQL> select max(ktuxescnw * power(2, 32) + ktuxescnb) scn from x$ktuxe;
SCN
----------
31014
---3.4 查询数据块可用空间大小。
Select kvisval,kvistag,kvisdsc from sys.x$kvis;
--3.5检查当前oracle 的连接类型:
select server
from v$session
where audisid=USERENV(‘SESSIONID’);
如果 输出
SERVER
―――――――――――
DEDICATED
说明当前的oracle 连接实用的是专用服务器连接 ,而不是MTS多线程服务器(SHARED)
---3.6. 查看数据数据字典的SQL
select * from dict
---3.7检查后台线程的状态
Select name,Description
From V$BGPROCESS
Where Paddr<>’00’ (进程地址不等于’00’)
输出结果类似:
name description
-------- ---------------------------------
Pmon Process Cleanup
Dbwo db Writer Process 0
Lgwr Redo Etc
Ckpt checkpoint
。。。 。。。
---3.8 显示表结构
desc tablename(任意表名);
输出结果类似:
name null? Type
---------------------------- -------------------- ------------------
ID Not Null Number(30)
发表评论
-
Merge into bug?
2014-07-02 10:54 3782在ORACLE 11.2.0.3上执行merge into ... -
AWR 报告关键部分
2014-06-09 10:38 4461、后台等待事件 2、按Gets排序的SQL 3、按读取 ... -
DBLinks 新增加字段后,提示标识符无效
2014-06-06 15:03 1118在用DBlinks同步数据中,原表和目标表增加了 ... -
PowerDesigner 之 report html
2014-04-09 12:04 692谁说的PowerDesigner 导出的Html不好看?在相对 ... -
Oracle之行转列
2014-04-04 14:53 548select regexp_substr(in_code_k ... -
用 Oracle 数据库 10g 通过回收浪费的空间、联机重组表格和评估增长的趋势,有效地在段中进行存储管理
2010-06-22 14:45 2028近来,有人要求我评估一个与 Oracle 数据库竞争的 RDB ... -
官方的linux下卸载oracle步骤
2010-05-19 16:40 17135 Removing Oracle SoftwareThis ... -
Oracle服务器如何科学组织RAID阵列
2010-05-11 13:37 1365我们在部署服务器时通 ... -
通过Oracle发送Email
2010-05-11 13:14 1363本篇是通过Oracle10g发送Email实例,该Proce ... -
bsd_sendemail
2010-05-11 13:02 957create or replace procedure bsd ... -
Oracle PL/SQL编程规范指南
2010-05-11 12:31 1335一、PL/SQL编程规范之大 ... -
全面认识Oracle数据库字符集
2010-05-01 14:16 898什么是Oracle字符集 Oracle字符集是一个字节数 ... -
Oracle 系统表大全
2010-04-21 15:04 740数据字典dict总是属于Oracle用户sys的。 1、用户 ... -
Oracle中杀不掉的锁
2010-04-21 14:29 711一些ORACLE中的进程被杀掉后,状态被置为"kil ... -
flashback table
2010-04-07 10:50 1688小心误删除了某个表中 ... -
clob_to_varchar2
2010-03-18 18:31 813CREATE OR REPLACE FUNCTION kf_c ... -
一道数据库开发面试题
2010-03-18 17:56 1691已知表route,字段和内容如下: 起始节点 终止节点 ... -
PL/SQL的递归调用
2010-03-18 17:51 1062已知表route,字段和内容如下: 起始节点 终止节点 距离 ... -
分析函数3(Top/Bottom N、First/Last、NTile)
2010-03-18 17:42 1053一、带空值的排列: 假如被排列的数据中含有空值呢? SQL& ... -
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