Oracle不导入dblink,（转）记一次远程不落地dblink数据迁移的全过程
那么问题来了，因冻结期无法分盘挂存储，expdp导入导出数据要落地根本行不通,怎么办呢？方案制定因数据无法落地，考虑使用目标端创建dblink指向源库，在目标库上使用impdp的network_link参数进行远程数据导入实施准备源库scheam表空间、户查询检查表空间对应的数据文件大小
select tablespace_name, file_name, bytes / 1024 /
1024 from dba_data_files
where tablespace_name in (‘FAXDBSERVER’);
检查用户所对应表空间
select username, default_tablespace from dba_users order by 1;
检查用户状态及默认表空间
select username, account_status, default_tablespace
from dba_users where username
in (‘FAXDBSERVER’) order by
2;
检查所属owner
select distinct owner, segment_type, tablespace_name
from dba_extents
where owner in
(‘FAXDBSERVER’);
检查表的行数
select table_name, num_rows from
all_tables where owner =
‘FAXDBSERVER’ group by table_name, num_rows
having num_rows > 500 order
by table_name;
TABLE_NAME NUM_ROWS
——————————
—————————————-
T_DNINFO
26878
T_FAXRECINFO 98120
T_FAXSENDINFO 219703
T_FAXSENDINFO_BK 3563
检查对象的数量
Select owner, object_type, count(*)
from
dba_objects where owner =
‘FAXDBSERVER’ group by owner,
object_type order by owner,
object_type;
OWNER OBJECT_TYPE COUNT(*)
——————————
——————- —————————–
FAXDBSERVER INDEX 5
FAXDBSERVER SEQUENCE 3
FAXDBSERVER TABLE 6
FAXDBSERVER TRIGGER 2
源库scheam对象、数据、特殊字符类型查询方案执行NO
1目标库创建所需的表空间create
tablespace B2C_DATE datafile ‘/oradata/sx11t01/B2C_DATE _u01.dbf’
size 200m autoextend on next 100m maxsize 8192m;
create
tablespace B2C_INDEX datafile
‘/oradata/sx11t01/B2C_INDEX_u01.dbf’ size 200m autoextend on next
100m maxsize 8192m;
方案执行NO 2目标端创建db_link(使用源库的DBA账号:observer
)create database link expdp_link connect to observer
identified by **********
using
‘(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = TCP)(HOST = 10.188.100.123)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = ITSHOWDB)
)
)’;
方案执行NO 3创建directory
create or
replace directory imp_itshow as ‘/oradata/dump’;
grant
read, write on directory imp_itshow to public;
方案执行NO 4源库后台进行远程数据导入
nohup
impdp \’/ as sysdba\’
directory=imp_itshow
network_link=expdp_link
schemas=ITSHOW
logfile=impdp_0120.log &
数据 验证导入完毕后对目标库数据验证思考network_link参数1、network_link不支持long字段的迁移
2、network_link通过insert，select + dblink来实现，迁移速度慢
3、创建dblink如果只针对私有用户则需要给该用户Aexp_full_database权限
4、使用network_link进行数据迁移可能会遇到Wait for shrink lock2 或wait for unread
message on broadcas等待事件造成impdp hang