生产环境下，oracle不同用户间的数据迁移。第二部分

任务名称：生产环境下schema ELON数据迁移至schema TIAN
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测试二：测试参数remap_tablespace

导出schema ELON的全部数据：
[oracle@PROD-DB01 ~]$expdp system/xxxxxx SCHEMAS=ELON directory=EXPDP_DIR dumpfile =ELON_`date +"%Y%m%d%H%M%S"`.dmp logfile=ELON_`date +"%Y%m%d%H%M%S"`_exp.log
将dmp文件导入到LAS下：
[oracle@PROD-DB01 ~]$impdp system/xxxxxx directory=EXPDP_DIR dumpfile=ELON_`date +"%Y%m%d%H%M%S"`.dmp logfile=ELON_`date +"%Y%m%d%H%M%S"`_impdp.log remap_schema=ELON:TEST TABLE_EXISTS_ACTION=SKIP

LAS默认表空间的使用情况：
SQL> select df.tablespace_name ,totalspace total_size, (totalspace-freespace) used_size,freespace avail_size ,round((1-freespace/totalspace)*100) as used_ratio
from (select tablespace_name,round(sum(bytes)/1024/1024) totalspace
from dba_data_files group by tablespace_name) df,(select tablespace_name,round(sum(bytes)/1024/1024) freespace
from dba_free_space group by tablespace_name) fs where df.tablespace_name=fs.tablespace_name and df.tablespace_name not like 'UNDOTBS%';

TABLESPACE_NAME TOTAL_SIZE USED_SIZE AVAIL_SIZE USED_RATIO
------------------------------ ---------- ---------- ---------- ----------
ELON_IDX01 10240 88 10152 1
SYSAUX 3072 1753 1319 57
ELON_DATA01 20480 2812 17668 14
LAS_IDX01 10240 3591 6649 35
USERS 1024 2 1022 0
SYSTEM 2048 847 1201 41

结论：如果不指定remap_tablespace，导入到TEST之后，数据还是在ELON用户的默认表空间。

SQL> select df.tablespace_name ,totalspace total_size, (totalspace-freespace) used_size,freespace avail_size ,round((1-freespace/totalspace)*100) as used_ratio
from (select tablespace_name,round(sum(bytes)/1024/1024) totalspace
from dba_data_files group by tablespace_name) df,(select tablespace_name,round(sum(bytes)/1024/1024) freespace
from dba_free_space group by tablespace_name) fs where df.tablespace_name=fs.tablespace_name and df.tablespace_name not like 'UNDOTBS%';

TABLESPACE_NAME TOTAL_SIZE USED_SIZE AVAIL_SIZE USED_RATIO
------------------------------ ---------- ---------- ---------- ----------
ELON_IDX01 10240 88 10152 1
SYSAUX 3072 1753 1319 57
ELON_DATA01 20480 1979 18501 10
LAS_IDX01 10240 3591 6649 35
USERS 1024 2 1022 0
SYSTEM 2048 845 1203 41
重建TEST用户及表空间
SQL> drop user TEST cascade;
User dropped.
SQL> create tablespace TEST_DATA01 datafile '/data/app/oracle/oradata/TEST_DATA01.DBF' size 1G autoextend on;
Tablespace created.
SQL> create tablespace TEST_IDX01 datafile '/data/app/oracle/oradata/TEST_IDX01.DBF' size 1G autoextend on;
Tablespace created.
SQL> create temporary tablespace TEST_TEMP01 tempfile '/data/app/oracle/oradata/TEST_TEMP01.DBF' size 1G autoextend on;
Tablespace created.
SQL> create user TEST identified by TEST default tablespace TEST_DATA01 temporary tablespace TEST_TEMP01;
User created.
SQL> select df.tablespace_name ,totalspace total_size, (totalspace-freespace) used_size,freespace avail_size ,round((1-freespace/totalspace)*100) as used_ratio
from (select tablespace_name,round(sum(bytes)/1024/1024) totalspace
from dba_data_files group by tablespace_name) df,(select tablespace_name,round(sum(bytes)/1024/1024) freespace
from dba_free_space group by tablespace_name) fs where df.tablespace_name=fs.tablespace_name and df.tablespace_name not like 'UNDOTBS%';

TABLESPACE_NAME TOTAL_SIZE USED_SIZE AVAIL_SIZE USED_RATIO
------------------------------ ---------- ---------- ---------- ----------
ELON_IDX01 10240 88 10152 1
TEST_DATA01 1024 1 1023 0
SYSAUX 3072 1754 1318 57
ELON_DATA01 20480 1979 18501 10
LAS_IDX01 10240 3591 6649 35
USERS 1024 2 1022 0
SYSTEM 2048 845 1203 41
TEST_IDX01 1024 1 1023 0

再次导入数据：
查询用户的ELON的默认表空间
SQL> select username,default_tablespace,temporary_tablespace from dba_users where username = 'ELON';
ELON ELON_DATA01 ELON_TEMP
确定索引表空间
SQL>select owner,index_name,tablespace_name from dba_indexes where owner='ELON';
ELON IDX_INFO_REQ_DATE ELON_DATA01
ELON PK_T_SYS_EXCEPTION ELON_IDX01
ELON PK_T_MESSAGE ELON_IDX01
导入数据
[oracle@PROD-DB01 ~]$impdp system/xxxxxx directory=EXPDP_DIR dumpfile=ELON_`date +"%Y%m%d%H%M%S"`.dmp logfile=ELON_`date +"%Y%m%d%H%M%S"`_impdp.log remap_schema=ELON:TEST remap_tablespace=ELON_DATA01:TEST_DATA01,ELON_IDX01:TEST_IDX01,ELON_TEMP:TEST_TEMP01 TABLE_EXISTS_ACTION=SKIP

SQL> select df.tablespace_name ,totalspace total_size, (totalspace-freespace) used_size,freespace avail_size ,round((1-freespace/totalspace)*100) as used_ratio
2 from (select tablespace_name,round(sum(bytes)/1024/1024) totalspace
3 from dba_data_files group by tablespace_name) df,(select tablespace_name,round(sum(bytes)/1024/1024) freespace
4 from dba_free_space group by tablespace_name) fs where df.tablespace_name=fs.tablespace_name ;

TABLESPACE_NAME TOTAL_SIZE USED_SIZE AVAIL_SIZE USED_RATIO
------------------------------ ---------- ---------- ---------- ----------
ELON_IDX01 10240 88 10152 1
TEST_DATA01 2117 2029 88 96
SYSAUX 3072 1754 1318 57
ELON_DATA01 20480 1979 18501 10
UNDOTBS1 83910 8169 75741 10
LAS_IDX01 10240 3591 6649 35
USERS 1024 2 1022 0
SYSTEM 2048 845 1203 41
TEST_IDX01 1024 94 930 9

结论：通过制定remap_tablespace，新导入TEST的数据写入到TEST_DATA01，索引到TEST_IDX01