oracle和sqlserver查询时阻塞情况
1.oracle环境
create table test
(
id number(4),
name varchar2(20)
)
在一个session中
insert into test values(1,'aa');
在另一个session中
select * from test1;
查询没被阻塞
2.sqlserver环境
在一个session中
insert into test values(1,'aa');
在另一个session中
select * from test1;
查询被阻塞(实际上前一个session在update或delete时均会阻塞本次查询,当然,如果加上with (nolock),也不会被阻塞)
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sql> alter system switch logfile;
2.forcing checkpoints
sql> alter system checkpoint;
3.adding online redo log groups
sql> alter database add logfile [group 4]
sql> ('/disk3/log4a.rdo','/disk4/lo ......
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ALTER TABLESPACE app_data
ADD DATAFILE 'u01/oradata/userdata03.dbf'
SIZE 200M;
'创建表空间
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DATAFILE 'u01/oradata/userdata03.dbf' SIZE 100M
AUTOEXTEND ON NEXT 5M MAXSIZE 200M;
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DATAFILE ' ......
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SELECT shape from schools ORDER BY name;
SELECT objectid, sde.st_astext(SDE.ST_POINTfromSHAPE(shape,0)) AS points from schools;
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1. linux下启动oracle
su - oracle
sqlplus /nolog
conn /as sysdba
startup
exit
lsnrctl start
exit
2. linux下关闭oracle
su - oracle
sqlplus /nolog
conn /as sysdba
shutdown immediate
exit
lsnrctl stop
exit
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4、停止监听器
oracle@suse92:~ ......
