我的oracle9i学习笔记

核心提示： /*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 tabl

/*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 onwer='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;