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常用SQL查询:

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常用SQL查询:
 
1、查看表空间的名称及大小
 
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;
 
2、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;
 
3、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;
 
4、查看控制文件
 
select name from v$controlfile;
 
5、查看日志文件
 
select member from v$logfile;
 
6、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.***$TS_***AIL A,SYS.***$TS_USED B,SYS.***$TS_FREE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
 
7、查看数据库库对象
 
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, ***g_space, chain_cnt, ***g_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
 
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
 
16。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)
 
24.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
 
25. 查询表空间的碎片程度
 
select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name
h***ing 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;
 
26。查询有哪些数据库实例在运行
select inst_name from v$active_instances;
 
===========================================================
######### 创建数据库----look $ORACLE_HOME/rdbms/admin/buildall.sql #############
 
create database db01
maxlogfiles 10
maxdatafiles 1024
maxinstances 2
logfile
GROUP 1 ('/u01/oradata/db01/log_01_db01.rdo') SIZE 15M,
GROUP 2 ('/u01/oradata/db01/log_02_db01.rdo') SIZE 15M,
GROUP 3 ('/u01/oradata/db01/log_03_db01.rdo') SIZE 15M,
datafile 'u01/oradata/db01/system_01_db01.dbf') SIZE 100M,
undo tablespace UNDO
datafile '/u01/oradata/db01/undo_01_db01.dbf' SIZE 40M
default temporary tablespace TEMP
tempfile '/u01/oradata/db01/temp_01_db01.dbf' SIZE 20M
extent management local uniform size 128k
character set AL32UTE8
national character set AL16UTF16
set time_zone='America/New_York';
 
############### 数据字典 ##########
 
set wrap off
 
select * from v$dba_users;
 
grant select on table_name to user/rule;
 
select * from user_tables;
 
select * from all_tables;
 
select * from dba_tables;
 
revoke dba from user_name;
 
shutdown immediate
 
startup nomount
 
select * from v$instance;
 
select * from v$sga;
 
select * from v$tablespace;
 
alter session set nls_language=american;
 
alter database mount;
 
select * from v$database;
 
alter database open;
 
desc dictionary
 
select * from dict;
 
desc v$fixed_table;
 
select * from v$fixed_table;
 
set oracle_sid=foxconn
 
select * from dba_objects;
 
set serveroutput on
 
execute dbms_output.put_line('sfasd');
 
############# 控制文件 ###########
 
select * from v$database;
 
select * from v$tablespace;
 
select * from v$logfile;
 
select * from v$log;
 
select * from v$backup;
 
/*备份用户表空间*/
alter tablespace users begin backup;
 
select * from v$archived_log;
 
select * from v$controlfile;
 
alter system set control_files='$ORACLE_HOME/oradata/u01/ctrl01.ctl',
'$ORACLE_HOME/oradata/u01/ctrl02.ctl' scope=spfile;
 
cp $ORACLE_HOME/oradata/u01/ctrl01.ctl $ORACLE_HOME/oradata/u01/ctrl02.ctl
 
startup pfile='../initSID.ora'
 
select * from v$parameter where name like 'control%' ;
 
show parameter control;
 
select * from v$controlfile_record_section;
 
select * from v$tempfile;
 
/*备份控制文件*/
alter database backup controlfile to '../filepath/control.bak';
 
/*备份控制文件,并将二进制控制文件变为了asc 的文本文件*/
alter database backup controlfile to trace;
 
############### redo log ##############
 
archive log list;
 
alter system archive log start;--启动自动存档
 
alter system switch logfile;--强行进行一次日志switch
 
alter system checkpoint;--强制进行一次checkpoint
 
alter tablspace users begin backup;
 
alter tablespace offline;
 
/*checkpoint 同步频率参数FAST_START_MTTR_TARGET,同步频率越高,系统恢复所需时间越短*/
show parameter fast;
 
show parameter log_checkpoint;
 
/*加入一个日志组*/
alter database add logfile group 3 ('/$ORACLE_HOME/oracle/ora_log_file6.rdo' size 10M);
 
/*加入日志组的一个成员*/
alter database add logfile member '/$ORACLE_HOME/oracle/ora_log_file6.rdo' to group 3;
 
/*删除日志组:当前日志组不能删;活动的日志组不能删;非归档的日志组不能删*/
alter database drop logfile group 3;
 
/*删除日志组中的某个成员,但每个组的最后一个成员不能被删除*/
alter databse drop logfile member '$ORACLE_HOME/oracle/ora_log_file6.rdo';
 
/*清除在线日志*/
alter database clear logfile '$ORACLE_HOME/oracle/ora_log_file6.rdo';
 
alter database clear logfile group 3;
 
/*清除非归档日志*/
alter database clear unarchived logfile group 3;
 
/*重命名日志文件*/
alter database rename file '$ORACLE_HOME/oracle/ora_log_file6.rdo' to '$ORACLE_HOME/oracle/ora_log_file6a.rdo';
 
show parameter db_create;
 
alter system set db_create_online_log_dest_1='path_name';
 
select * from v$log;
 
select * from v$logfile;
 
/*数据库归档模式到非归档模式的互换,要启动到mount状态下才能改变;startup mount;然后再打开数据库.*/
alter database noarchivelog/archivelog;
 
achive log start;---启动自动归档
 
alter system archive all;--手工归档所有日志文件
 
select * from v$archived_log;
 
show parameter log_archive;
 
###### 分析日志文件logmnr ##############
 
1) 在init.ora中set utl_file_dir 参数
2) 重新启动oracle
3) create 目录文件
desc dbms_logmnr_d;
dbms_logmnr_d.build;
4) 加入日志文件 add/remove log file
dhms_logmnr.add_logfile
dbms_logmnr.removefile
5) start logmnr
dbms_logmnr.start_logmnr
6) 分析出来的内容查询 v$logmnr_content --sqlredo/sqlundo
 
实践:
 
desc dbms_logmnr_d;
 
/*对数据表做一些操作,为恢复操作做准备*/
update 表 set qty=10 where stor_id=6380;
 
delete 表 where stor_id=7066;
/***********************************/
utl_file_dir的路径
execute dbms_logmnr_d.build('foxdict.ora','$ORACLE_HOME/oracle/admin/fox/cdump');
 
execute dbms_logmnr.add_logfile('$ORACLE_HOME/oracle/ora_log_file6.log',dbms_logmnr.newfile);
 
execute dbms_logmnr.start_logmnr(dictfilename=>'$ORACLE_HOME/oracle/admin/fox/cdump/foxdict.ora');
 
######### tablespace ##############
 
select * form v$tablespace;
 
select * from v$datafile;
 
/*表空间和数据文件的对应关系*/
select t1.name,t2.name from v$tablespace t1,v$datafile t2 where t1.ts#=t2.ts#;
 
alter tablespace users add datafile 'path' size 10M;
 
select * from dba_rollback_segs;
 
/*限制用户在某表空间的使用限额*/
alter user user_name quota 10m on tablespace_name;
 
create tablespace xxx [datafile 'path_name/datafile_name'] [size xxx] [extent management local/dictionary] [default storage(xxx)];
 
exmple: create tablespace userdata datafile '$ORACLE_HOME/oradata/userdata01.dbf' size 100M AUTOEXTEND ON NEXT 5M MAXSIZE 200M;
create tablespace userdata datafile '$ORACLE_HOME/oradata/userdata01.dbf' size 100M extent management dictionary default storage(initial 100k next 100k pctincrease 10) offline;
/*9i以后,oracle建议使用local管理,而不使用dictionary管理,因为local采用bitmap管理表空间 ,不会产生系统表空间的自愿争用;*/
create tablespace userdata datafile '$ORACLE_HOME/oradata/userdata01.dbf' size 100M extent management local uniform size 1m;
create tablespace userdata datafile '$ORACLE_HOME/oradata/userdata01.dbf' size 100M extent management local autoallocate;
/*在创建表空间时,设置表空间内的段空间管理模式,这里用的是自动管理*/
create tablespace userdata datafile '$ORACLE_HOME/oradata/userdata01.dbf' size 100M extent management local uniform size 1m segment space management auto;
 
alter tablespace userdata mininum extent 10;
 
alter tablespace userdata default storage(initial 1m next 1m pctincrease 20);
 
/*undo tablespace(不能被用在字典管理模下) */
create undo tablespace undo1 datafile '$ORACLE_HOME/oradata/undo101.dbf' size 40M extent management local;
 
show parameter undo;
 
/*temporary tablespace*/
create temporary tablespace userdata tempfile '$ORACLE_HOME/oradata/undo101.dbf' size 10m extent management local;
 
/*设置数据库缺省的临时表空间*/
alter database default temporary tablespace tablespace_name;
 
/*系统/临时/在线的undo表空间不能被offline*/
alter tablespace tablespace_name offline/online;
 
alter tablespace tablespace_name read only;
 
/*重命名用户表空间*/
alter tablespace tablespace_name rename datafile '$ORACLE_HOME/oradata/undo101.dbf' to '$ORACLE_HOME/oradata/undo102.dbf';
 
/*重命名系统表空间 ,但在重命名前必须将数据库shutdown,并重启到mount状态*/
alter database rename file '$ORACLE_HOME/oradata/system01.dbf' to '$ORACLE_HOME/oradata/system02.dbf';
 
drop tablespace userdata including contents and datafiles;---drop tablespce
 
/*resize tablespace,autoextend datafile space*/
alter database datafile '$ORACLE_HOME/oradata/undo102.dbf' autoextend on next 10m maxsize 500M;
 
/*resize datafile*/
alter database datafile '$ORACLE_HOME/oradata/undo102.dbf' resize 50m;
 
/*给表空间扩展空间*/
alter tablespace userdata add datafile '$ORACLE_HOME/oradata/undo102.dbf' size 10m;
 
/*将表空间设置成OMF状态*/
alter system set db_create_file_dest='$ORACLE_HOME/oradata';
 
create tablespace userdata;---use OMF status to create tablespace;
 
drop tablespace userdata;---user OMF status to drop tablespace;
 
select * from dba_tablespace/v$tablespace/dba_data_files;
 
/*将表的某分区移动到另一个表空间*/
alter table table_name move partition partition_name tablespace tablespace_name;
 
###### ORACLE storage structure and relationships #########
 
/*手工分配表空间段的分区(extend)大小*/
alter table kong.test12 allocate extent(size 1m datafile '$ORACLE_HOME/oradata/undo102.dbf');
 
alter table kong.test12 deallocate unused; ---释放表中没有用到的分区
 
show parameter db;
 
alter system set db_8k_cache_size=10m; ---配置8k块的内存空间块参数
 
select * from dba_extents/dba_segments/data_tablespace;
 
select * from dba_free_space/dba_data_file/data_tablespace;
 
/*数据对象所占用的字节数*/
select sum(bytes) from dba_extents where ōnwer='kong' and segment_name ='table_name';
 
############ UNDO Data ################
 
show parameter undo;
 
alter tablespace users offline normal;
 
alter tablespace users offline immediate;
 
recover datafile '$ORACLE_HOME/oradata/undo102.dbf';
 
alter tablespace users online ;
 
select * from dba_rollback_segs;
 
alter system set undo_tablespace=undotbs1;
 
/*忽略回滚段的错误提示*/
alter system set undo_suppress_errors=true;
 
/*在自动管理模式下,不会真正建立rbs1;在手工管理模式则可以建立,且是私有回滚段*/
create rollback segment rbs1 tablespace undotbs;
 
desc dbms_flashback;
 
/*在提交了修改的数据后,9i提供了旧数据的回闪操作,将修改前的数据只读给用户看,但这部分数据不会又恢复在表中,而是旧数据的一个映射*/
execute dbms_flashback.enable_at_time('26-JAN-04:12:17:00 pm');
 
execute dbms_flashback.disable;
 
/*回滚段的统计信息*/
select end_time,begin_time,undoblks from v$undostat;
 
/*undo表空间的大小计算公式: UndoSpace=[UR * (UPS * DBS)] + (DBS * 24)
UR :UNDO_RETENTION 保留的时间(秒)
UPS :每秒的回滚数据块
DBS:系统EXTENT和FILE SIZE(也就是db_block_size)*/
 
select * from dba_rollback_segs/v$rollname/v$rollstat/v$undostat/v$session/v$transaction;
 
show parameter transactions;
 
show parameter rollback;
 
/*在手工管理模式下,建立公共的回滚段*/
create public rollback segment prbs1 tablespace undotbs;
 
alter rollback segment rbs1 online;----在手工管理模式
 
/*在手工管理模式中,initSID.ora中指定 undo_management=manual 、rollback_segment=('rbs1','rbs2',...)、
transactions=100 、transactions_per_rollback_segment=10
然后 shutdown immediate ,startup pfile=....\???.ora */
 
########## Managing Tables ###########
 
/*char type maxlen=2000;varchar2 type maxlen=4000 bytes
rowid 是18位的64进制字符串 (10个bytes 80 bits)
rowid组成: object#(对象号)--32bits,6位
rfile#(相对文件号)--10bits,3位
block#(块号)--22bits,6位
row#(行号)--16bits,3位
64进制: A-Z,a-z,0-9,/,+ 共64个符号
 
dbms_rowid 包中的函数可以提供对rowid的解释*/
 
select rowid,dbms_rowid.rowid_block_number(rowid),dbms_rowid.rowid_row_number(rowid) from table_name;
 
create table test2
(
id int,
lname varchar2(20) not null,
fname varchar2(20) constraint ck_1 check(fname like 'k%'),
empdate date default sysdate)
) tablespace tablespace_name;
 
 
create global temporary table test2 on commit delete/preserve rows as select * from kong.authors;
 
create table user.table(...) tablespace tablespace_name storage(...) pctfree10 pctused 40;
 
alter table user.tablename pctfree 20 pctused 50 storage(...);---changing table storage
 
/*手工分配分区,分配的数据文件必须是表所在表空间内的数据文件*/
alter table user.table_name allocate extent(size 500k datafile '...');
 
/*释放表中没有用到的空间*/
alter table table_name deallocate unused;
 
alter table table_name deallocate unused keep 8k;
 
/*将非分区表的表空间搬到新的表空间,在移动表空间后,原表中的索引对象将会不可用,必须重建*/
alter table user.table_name move tablespace new_tablespace_name;
 
create index index_name on user.table_name(column_name) tablespace users;
 
alter index index_name rebuild;
 
drop table table_name [CASCADE CONSTRAINTS];
 
alter table user.table_name drop column col_name [CASCADE CONSTRAINTS CHECKPOINT 1000];---drop column
 
/*给表中不用的列做标记*/
alter table user.table_name set unused column comments CASCADE CONSTRAINTS;
 
/*drop表中不用的做了标记列*/
alter table user.table_name drop unused columns checkpoint 1000;
 
/*当在drop col是出现异常,使用CONTINUE,防止重删前面的column*/
ALTER TABLE USER.TABLE_NAME DROP COLUMNS CONTINUE CHECKPOINT 1000;
 
select * from dba_tables/dba_objects;
 
######## managing indexes ##########
 
/*create index*/
example:
/*创建一般索引*/
create index index_name on table_name(column_name) tablespace tablespace_name;
/*创建位图索引*/
create bitmap index index_name on table_name(column_name1,column_name2) tablespace tablespace_name;
/*索引中不能用pctused*/
create [bitmap] index index_name on table_name(column_name) tablespace tablespace_name pctfree 20 storage(inital 100k next 100k) ;
/*大数据量的索引最好不要做日志*/
create [bitmap] index index_name table_name(column_name1,column_name2) tablespace_name pctfree 20 storage(inital 100k next 100k) nologging;
/*创建反转索引*/
create index index_name on table_name(column_name) reverse;
/*创建函数索引*/
create index index_name on table_name(function_name(column_name)) tablespace tablespace_name;
/*建表时创建约束条件*/
create table user.table_name(column_name number(7) constraint constraint_name primary key deferrable using index storage(initial 100k next 100k) tablespace tablespace_name,column_name2 varchar2(25) constraint constraint_name not null,column_name3 number(7)) tablespace tablespace_name;
 
/*给创建bitmap index分配的内存空间参数,以加速建索引*/
show parameter create_bit;
 
/*改变索引的存储参数*/
alter index index_name pctfree 30 storage(initial 200k next 200k);
 
/*给索引手工分配一个分区*/
alter index index_name allocate extent (size 200k datafile '$ORACLE/oradata/..');
 
/*释放索引中没用的空间*/
alter index index_name deallocate unused;
 
/*索引重建*/
alter index index_name rebuild tablespace tablespace_name;
 
/*普通索引和反转索引的互换*/
alter index index_name rebuild tablespace tablespace_name reverse;
 
/*重建索引时,不锁表*/
alter index index_name rebuild online;
 
/*给索引整理碎片*/
alter index index_name COALESCE;
 
/*分析索引,事实上是更新统计的过程*/
analyze index index_name validate structure;
 
desc index_state;
 
drop index index_name;
 
alter index index_name monitoring usage;-----监视索引是否被用到
 
alter index index_name nomonitoring usage;----取消监视
 
/*有关索引信息的视图*/
select * from dba_indexes/dba_ind_columns/dbs_ind_expressions/v$object_usage;
 
########## 数据完整性的管理(Maintaining data integrity) ##########
 
alter table table_name drop constraint constraint_name;----drop 约束
 
alter table table_name add constraint constraint_name primary key(column_name1,column_name2);-----创建主键
 
alter table table_name add constraint constraint_name unique(column_name1,column_name2);---创建唯一约束
 
/*创建外键约束*/
alter table table_name add constraint constraint_name foreign key(column_name1) references table_name(column_name1);
 
/*不效验老数据,只约束新的数据[enable/disable:约束/不约束新数据;novalidate/validate:不对/对老数据进行验证]*/
alter table table_name add constraint constraint_name check(column_name like 'B%') enable/disable novalidate/validate;
 
/*修改约束条件,延时验证,commit时验证*/
alter table table_name modify constraint constraint_name initially deferred;
 
/*修改约束条件,立即验证*/
alter table table_name modify constraint constraint_name initially immediate;
 
alter session set constraints=deferred/immediate;
 
/*drop一个有外键的主键表,带cascade constraints参数级联删除*/
drop table table_name cascade constraints;
 
/*当truncate外键表时,先将外键设为无效,再truncate;*/
truncate table table_name;
 
/*设约束条件无效*/
alter table table_name disable constraint constraint_name;
 
alter table table_name enable novalidate constraint constraint_name;
 
/*将无效约束的数据行放入exception的表中,此表记录了违反数据约束的行的行号;在此之前,要先建exceptions表*/
alter table table_name add constraint constraint_name check(column_name >15) enable validate exceptions into exceptions;
 
/*运行创建exceptions表的脚本*/
start $ORACLE_HOME/rdbms/admin/utlexcpt.sql;
 
/*获取约束条件信息的表或视图*/
select * from user_constraints/dba_constraints/dba_cons_columns;
 
################## managing password security and resources ####################
 
alter user user_name account unlock/open;----锁定/打开用户;
 
alter user user_name password expire;---设定口令到期
 
/*建立口令配置文件,failed_login_attempts口令输多少次后锁,password_lock_times指多少天后口令被自动解锁*/
create profile profile_name limit failed_login_attempts 3 password_lock_times 1/1440;
/*创建口令配置文件*/
create profile profile_name limit failed_login_attempts 3 password_lock_time unlimited password_life_time 30 password_reuse_time 30 password_verify_function verify_function password_grace_time 5;
/*建立资源配置文件*/
create profile prfile_name limit session_per_user 2 cpu_per_session 10000 idle_time 60 connect_time 480;
 
alter user user_name profile profile_name;
 
/*设置口令解锁时间*/
alter profile profile_name limit password_lock_time 1/24;
 
/*password_life_time指口令文件多少时间到期,password_grace_time指在第一次成功登录后到口令到期有多少天时间可改变口令*/
alter profile profile_name limit password_lift_time 2 password_grace_time 3;
 
/*password_reuse_time指口令在多少天内可被重用,password_reuse_max口令可被重用的最大次数*/
alter profile profile_name limit password_reuse_time 10[password_reuse_max 3];
 
alter user user_name identified by input_password;-----修改用户口令
 
drop profile profile_name;
 
/*建立了profile后,且指定给某个用户,则必须用CASCADE才能删除*/
drop profile profile_name CASCADE;
 
alter system set resource_limit=true;---启用自愿限制,缺省是false
 
/*配置资源参数*/
alter profile profile_name limit cpu_per_session 10000 connect_time 60 idle_time 5;
/*资源参数(session级)
cpu_per_session 每个session占用cpu的时间 单位1/100秒
sessions_per_user 允许每个用户的并行session数
connect_time 允许连接的时间 单位分钟
idle_time 连接被空闲多少时间后,被自动断开 单位分钟
logical_reads_per_session 读块数
***_sga 用户能够在SGA中使用的私有的空间数 单位bytes
 
(call级)
cpu_per_call 每次(1/100秒)调用cpu的时间
logical_reads_per_call 每次调用能够读的块数
*/
 
alter profile profile_name limit cpu_per_call 1000 logical_reads_per_call 10;
 
desc dbms_resouce_manager;---资源管理器包
 
/*获取资源信息的表或视图*/
select * from dba_users/dba_profiles;
 
###### Managing users ############
 
show parameter os;
 
create user testuser1 identified by kxf_001;
 
grant connect,createtable to testuser1;
 
alter user testuser1 quota 10m on tablespace_name;
 
/*创建用户*/
create user user_name identified by password default tablespace tablespace_name temporary tablespace tablespace_name quota 15m on tablespace_name password expire;
 
/*数据库级设定缺省临时表空间*/
alter database default temporary tablespace tablespace_name;
 
/*制定数据库级的缺省表空间*/
alter database default tablespace tablespace_name;
 
/*创建os级审核的用户,需知道os_authent_prefix,表示oracle和os口令对应的前缀,'OPS$'为此参数的值,此值可以任意设置*/
create user user_name identified by externally default OPS$tablespace_name tablespace_name temporary tablespace tablespace_name quota 15m on tablespace_name password expire;
 
/*修改用户使用表空间的限额,回滚表空间和临时表空间不允许授予限额*/
alter user user_name quota 5m on tablespace_name;
 
/*删除用户或删除级联用户(用户对象下有对象的要用CASCADE,将其下一些对象一起删除)*/
drop user user_name [CASCADE];
 
/*每个用户在哪些表空间下有些什么限额*/
desc dba_ts_quotas;select * from dba_ts_quotas where username='...';
 
/*改变用户的缺省表空间*/
alter user user_name default tablespace tablespace_name;
 
######### Managing Privileges #############
 
grant create table,create session to user_name;
 
grant create any table to user_name; revoke create any table from user_name;
 
/*授予权限语法,public 标识所有用户,with admin option允许能将权限授予第三者的权限*/
grant system_privs,[......] to [user/role/public],[....] [with admin option];
 
select * from v$pwfile_users;
 
/*当 O7_dictionary_accessiblity参数为True时,标识select any table时,包括系统表也能select ,否则,不包含系统表;缺省为false*/
show parameter O7;
 
/*由于 O7_dictionary_accessiblity为静态参数,不能动态改变,故加scope=spfile,下次启动时才生效*/
alter system set O7_dictionary_accessiblity=true scope=spfile;
 
/*授予对象中的某些字段的权限,如select 某表中的某些字段的权限*/
grant [object_privs(column,....)],[...] on object_name to user/role/public,... with grant option;
 
/*oracle不允许授予select某列的权限,但可以授insert ,update某列的权限*/
grant insert(column_name1,column_name2,...) on table_name to user_name with grant option;
 
select * from dba_sys_privs/session_privs/dba_tab_privs/user_tab_privs/dba_col_privs/user_col_privs;
 
/*db/os/none 审计被记录在 数据库/操作系统/不审计 缺省是none*/
show parameter audit_trail;
 
/*启动对表的select动作*/
audit select on user.table_name by session;
 
/*by session在每个session中发出command只记录一次,by access则每个command都记录*/
audit [create table][select/update/insert on object by session/access][whenever successful/not successful];
 
desc dbms_fga;---进一步设计,则可使用dbms_fgs包
 
/*取消审计*/
noaudit select on user.table_name;
 
/*查被审计信息*/
select * from all_def_audit_opts/dba_stmt_audit_opts/dba_priv_audit_opts/dba_obj_audit_opts;
 
/*获取审计记录*/
select * from dba_audit_trail/dba_audit_exists/dba_audit_object/dba_audit_session/dba_audit_statement;
 
########### Managing Role #################
 
create role role_name; grant select on table_name to role_name; grant role_name to user_name; set role role_name;
 
create role role_name;
create role role_name identified by password;
create role role_name identified externally;
 
set role role_name ; ----激活role
set role role_name identified by password;
 
alter role role_name not identified;
alter role role_name identified by password;
alter role role_name identified externally;
 
grant priv_name to role_name [WITH ADMIN OPTION];
grant update(column_name1,col_name2,...) on table_name to role_name;
grant role_name1 to role_name2;
 
/*建立default role,用户登录时,缺省激活default role*/
alter user user_name default role role_name1,role_name2,...;
alter user user_name default role all;
alter user user_name default role all except role_name1,...;
alter user user_name default role none;
 
set role role1 [identified by password],role2,....;
set role all;
set role except role1,role2,...;
set role none;
 
revoke role_name from user_name;
revoke role_name from public;
 
drop role role_name;
 
select * from dba_roles/dba_role_privs/role_role_privs/dba_sys_privs/role_sys_privs/role_tab_privs/session_roles;
 
########### Basic SQL SELECT ################
 
select col_name as col_alias from table_name ;
 
select col_name from table_name where col1 like '_o%'; ----'_'匹配单个字符
 
/*使用字符函数(右边截取,字段中包含某个字符,左边填充某字符到固定位数,右边填充某字符到固定位数)*/
select substr(col1,-3,5),instr(col2,'g'),LPAD(col3,10,'$'),RPAD(col4,10,'%') from table_name;
 
/*使用数字函数(往右/左几位四舍五入,取整,取余)*/
select round(col1,-2),trunc(col2),mod(col3) from table_name ;
 
/*使用日期函数(计算两个日期间相差几个星期,两个日期间相隔几个月,在某个月份上加几个月,某个日期的下一个日期,
某日期所在月的最后的日期,对某个日期的月分四舍五入,对某个日期的月份进行取整)*/
select (sysdate-col1)/7 week,months_between(sysdate,col1),add_months(col1,2),next_day(sysdate,'FRIDAY'),last_day(sysdate),
round(sysdate,'MONTH'),trunc(sysdate,'MONTH') from table_name;
 
/*使用NULL函数(当expr1为空取expr2/当expr1为空取expr2,否则取expr3/当expr1=expr2返回空)*/
select nvl(expr1,expr2),nvl2(expr1,expr2,expr3),nullif(expr1,expr2) from table_name;
 
select column1,column2,column3, case column2 when '50' then column2*1.1
when '30' then column2*2.1
when '10' then column3/20
else column3
end as ttt
from table_name ; ------使用case函数
 
select table1.col1,table2.col2 from table1
[CROSS JOIN table2] | -----笛卡儿连接
[NATURAL JOIN table2] | -----用两个表中的同名列连接
[JOIN table2 USING (column_name)] | -----用两个表中的同名列中的某一列或几列连接
[JOIN table2
ON (table1.col1=table2.col2)] |
[LEFT|RIGHT|FULL OUTER JOIN table2 ------相当于(+)=,=(+)连接,全外连接
ON (table1.col1=table2.col2)]; ------SQL 1999中的JOIN语法;
 
example:
select col1,col2 from table1 t1
join table2 t2
on t1.col1=t2.col2 and t1.col3=t2.col1
join table3 t3
on t2.col1=t3.col3;
 
select * from table_name where col1 < any (select col2 from table_name2 where continue group by col3);
 
select * from table_name where col1 < all (select col2 from table_name2 where continue group by col3);
 
insert into (select col1,col2,col3 form table_name where col1> 50 with check option) values (value1,value2,value3);
 
MERGE INTO table_name table1
USING table_name2 table2
ON (table1.col1=table2.col2)
WHEN MATCHED THEN
UPDATE SET
table1.col1=table2.col2,
table1.col2=table2.col3,
...
WHEN NOT MATCHED THEN
INSERT VALUES(table2.col1,table2.col2,table2.col3,...); -----合并语句
 
##################### CREATE/ALTER TABLE #######################
 
alter table table_name drop column column_name ;---drop column
 
alter table table_name set unused (col1,col2,...);----设置列无效,这个比较快。
alter table table_name drop unused columns;---删除被设为无效的列
 
rename table_name1 to table_name2; ---重命名表
 
comment on table table_name is 'comment message';----给表放入注释信息
 
create table table_name
(col1 int not null,col2 varchar2(20),col3 varchar2(20),
constraint uk_test2_1 unique(col2,col3))); -----定义表中的约束条件
 
alter table table_name add constraint pk_test2 primary key(col1,col2,...); ----创建主键
 
/*建立外键*/
create table table_name (rid int,name varchar2(20),constraint fk_test3 foreign key(rid) references other_table_name(id));
 
alter table table_name add constraint ck_test3 check(name like 'K%');
 
alter table table_name drop constraint constraint_name;
 
alter table table_name drop primary key cascade;----级联删除主键
 
alter table table_name disable/enable constraint constraint_name;----使约束暂时无效
 
/*删除列,并级联删除此列下的约束条件*/
alter table table_name drop column column_name cascade constraint;
 
select * from user_constraints/user_cons_columns;---约束条件相关视图
 
############## Create Views #####################
 
CREATE [OR REPLACE] [FORCE|NOFORCE] VIEW view_name [(alias[,alias]...)]
AS subquery
[WITH CHECK OPTION [CONSTRAINT constraint_name]]
[WITH READ ONLY [CONSTRAINT constraint_name]]; ------创建视图的语法
 
example: Create or replace view testview as select col1,col2,col3 from table_name; ------创建视图
/*使用别名*/
Create or replace view testview as select col1,sum(col2) col2_alias from table_name;
/*创建复杂视图*/
Create view view_name (alias1,alias2,alias3,alias4) as select d.col1,min(e.col1),max(e.col1),***g(e.col1) from table_name1 e,table_name2 d where e.col2=d.col2 group by d.col1;
/*当用update修改数据时,必须满足视图的col1>10的条件,不满足则不能被改变.*/
Create or replace view view_name as select * from table_name where col1>10 with check option;
 
/*改变视图的值.对于简单视图可以用update语法修改表数据,但复杂视图则不一定能改。如使用了函数,group by ,distinct等的列*/
update view_name set col1=value1;
 
/*TOP-N分析*/
select [column_list],rownum from (select [column_list] from table_name order by Top-N_column) where rownum<=N;
 
/*找出某列三条最大值的记录*/
example: select rownum as rank ,col1 ,col2 from (select col1 ,col2 from table_name order by col2 desc) where rownum<=3;
 
############# Other database Object ###############
 
CREATE SEQUENCE sequence_name [INCREMENT BY n]
[START WITH n]
[{MAXVALUE n | NOMAXVALUE}]
[{MINVALUE n | NOMINVALUE}]
[{CYCEL | NOCYCLE}]
[{CACHE n | NOCACHE}]; -----创建SEQUENCE
 
example:
CREATE SEQUENCE sequence_name INCREMENT BY 10
START WITH 120
MAXVALUE 9999
NOCACHE
NOCYCLE;
 
select * from user_sequences ;---当前用户下记录sequence的视图
 
select sequence_name.nextval,sequence_name.currval from dual;-----sequence的引用
 
alter sequence sequence_name INCREMENT BY 20
MAXVALUE 999999
NOCACHE
NOCYCLE; -----修改sequence,不能改变起始序号
 
drop sequence sequence_name; ----删除sequence
 
CREATE [PUBLIC] SYNONYM synonym_name FOR object; ------创建同义词
 
DROP [PUBLIC] SYNONYM synonym_name;----删除同义词
 
CREATE PUBLIC DATABASE LINK link_name USEING OBJECT;----创建DBLINK
 
select * fromobject_name@link_name; ----访问远程数据库中的对象
 
/*union 操作,它将两个集合的交集部分压缩,并对数据排序*/
select col1,col2,col3 from table1_name union select col1,col2,col3 from table2_name;
 
/*union all 操作,两个集合的交集部分不压缩,且不对数据排序*/
select col1,col2,col3 from table1_name union all select col1,col2,col3 from table2_name;
 
/*intersect 操作,求两个集合的交集,它将对重复数据进行压缩,且排序*/
select col1,col2,col3 from table1_name intersect select col1,col2,col3 from table2_name;
 
/*minus 操作,集合减,它将压缩两个集合减后的重复记录, 且对数据排序*/
select col1,col2,col3 from table1_name minus select col1,col2,col3 from table2_name;
 
/*EXTRACT 抽取时间函数. 此例是抽取当前日期中的年*/
select EXTRACT(YEAR FROM SYSDATE) from dual;
/*EXTRACT 抽取时间函数. 此例是抽取当前日期中的月*/
select EXTRACT(MONTH FROM SYSDATE) from dual;
 
########################## 增强的 group by 子句 #########################
 
select [column,] group_function(column)...
from table
[WHERE condition]
[GROUP BY [ROLLUP] group_by_expression]
[H***ING h***ing_expression];
[ORDER BY column]; -------ROLLUP操作字,对group by子句的各字段从右到左进行再聚合
 
example:
/*其结果看起来象对col1做小计*/
select col1,col2,sum(col3) from table group by rollup(col1,col2);
/*复合rollup表达式*/
select col1,col2,sum(col3) from table group by rollup((col1,col2));
 
select [column,] group_function(column)...
from table
[WHERE condition]
[GROUP BY [CUBE] group_by_expression]
[H***ING h***ing_expression];
[ORDER BY column]; -------CUBE操作字,除完成ROLLUP的功能外,再对ROLLUP后的结果集从右到左再聚合
 
example:
/*其结果看起来象对col1做小计后,再对col2做小计,最后算总计*/
select col1,col2,sum(col3) from table group by cube(col1,col2);
/*复合rollup表达式*/
select col1,col2,sum(col3) from table group by cube((col1,col2));
/*混合rollup,cube表达式*/
select col1,col2,col3,sum(col4) from table group by col1,rollup(col2),cube(col3);
 
/*GROUPING(expr)函数,查看select语句种以何字段聚合,其取值为0或1*/
select [column,] group_function(column)...,GROUPING(expr)
from table
[WHERE condition]
[GROUP BY [ROLLUP] group_by_expression]
[H***ING h***ing_expression];
[ORDER BY column];
 
example:
select col1,col2,sum(col3),grouping(col1),grouping(col2) from table group by cube(col1,col2);
 
/*grouping sets操作,对group by结果集先对col1求和,再对col2求和,最后将其结果集并在一起*/
select col1,col2,sum(col3) from table group by grouping sets((col1),(col2));
 

TAG: SQL

 

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