前段时间入手了Nikon D90,主要是用来记录果果的成长的,由于从来没有玩过单反,真的是七窍通了六窍啊,惭愧之至。抓紧时间在他/她出生前练练手,不然我这个老爸也太逊了^-^。来张在楼下试拍的微距以资鼓励:

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Archive for May, 2010
新手拍微距
expdp的network_link参数
expdp是server端工具,但可以通过NETWORK_LINK参数实现远端导出,但是前提是远端也安装有Oracle数据库,只有CLIENT端是没有办法利用数据泵的。
这里要指出的是:network_link不支持远端导出分区表中的某一个分区,但可以导整个分区表。以下为测试过程:
创建分区表sales:
[oracle@ora10g ~]$ sqlplus ‘/as sysdba’
SQL> CREATE TABLE sales
(sale_date DATE NOT NULL)
PARTITION BY RANGE (sale_date)
(PARTITION sales2010_q1
VALUES LESS THAN (TO_DATE(’2010-04-01′,’YYYY-MM-DD’))
TABLESPACE sp1,
PARTITION sales2010_q2
VALUES LESS THAN (TO_DATE(’2010-07-01′,’YYYY-MM-DD’))
TABLESPACE sp2,
PARTITION sales2010_q3
VALUES LESS THAN (TO_DATE(’2010-10-01′,’YYYY-MM-DD’))
TABLESPACE sp3);
插入4条记录:
SQL> select count(*) from sales;
COUNT(*)
———-
4
SQL> select * from sales partition(sales2010_q1);
SALE_DATE
————
23-MAR-10
SQL> select * from sales partition(sales2010_q2);
SALE_DATE
————
23-JUN-10
22-JUN-10
SQL> select * from sales partition(sales2010_q3);
SALE_DATE
————
23-SEP-10
远端机器上创建 directory目录、赋权、创建dblink:
[oracle@node1 /]$ sqlplus ‘/as sysdba’
SQL> create directory dump_dir as ‘/backup’;
Directory created.
SQL> grant read,write on directory dump_dir to ochef;
Grant succeeded.
SQL> create database link test connect to ochef identified by oracle using ‘primary’;
Database link created.
SQL> select count(*) from ochef.sales@test;
COUNT(*)
———-
4
远程导出整个分区表:
[oracle@node1 ~]$ expdp ochef/oracle directory=dump_dir dumpfile=sales.dmp network_link=test tables=sales
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 – Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
Starting “OCHEF”.”SYS_EXPORT_TABLE_01″: ochef/******** directory=dump_dir dumpfile=sales.dmp network_link=test tables=sales
Estimate in progress using BLOCKS method…
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 384 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported “OCHEF”.”SALES” 4.960 KB 4 rows
Master table “OCHEF”.”SYS_EXPORT_TABLE_01″ successfully loaded/unloaded
******************************************************************************
Dump file set for OCHEF.SYS_EXPORT_TABLE_01 is:
/backup/sales.dmp
Job “OCHEF”.”SYS_EXPORT_TABLE_01″ successfully completed at 11:12:43
远程导出分区表的某个分区:
[oracle@node1 ~]$ expdp ochef/oracle directory=dump_dir dumpfile=sales.dmp network_link=test tables=sales:sales2010_q2
ORA-39001: invalid argument value
ORA-39203: Partition selection is not supported over a network link.
本地导出分区表的某个分区:
[oracle@ora10g ~]$ expdp ochef/oracle directory=dump_dir dumpfile=sales.dmp tables=sales:sales2010_q2
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 – Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting “OCHEF”.”SYS_EXPORT_TABLE_01″: ochef/******** directory=dump_dir dumpfile=sales.dmp tables=sales:sales2010_q2
Estimate in progress using BLOCKS method…
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 128 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported “OCHEF”.”SALES”:”SALES2010_Q2″ 4.937 KB 2 rows
Master table “OCHEF”.”SYS_EXPORT_TABLE_01″ successfully loaded/unloaded
******************************************************************************
Dump file set for OCHEF.SYS_EXPORT_TABLE_01 is:
/backup/sales.dmp
Job “OCHEF”.”SYS_EXPORT_TABLE_01″ successfully completed at 11:07:07
关于远程expdp用户权限问题,请移步这里。
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db_unique_name与service_name
为了data guard在角色切换时不用事先准备好二个init.ora参数文件,那么就需要配置valid_for参数,类似如下配置(备库):
db_unique_name=ora10gstd
log_archive_dest_1=’location=/u01/app/oracle/oradata/ora10g/archive valid_for=(all_logfiles,all_roles) db_unique_name=ora10gstd’
log_archive_dest_2=’service=standby lgwr async valid_for=(online_logfiles,primary_role) db_unique_name=ora10g’
db_unique_name在oracle的高可用dataguard的应用中会经常使用,有和db_name不一样的作用,在物理dg中,要求主、从库都有一样的db_name(虽然他们和rac不一样,并不是同一个库),但是他们的db_unique_name是不一样的,用以进行不同的标示。
注意:如果修改了db_unique_name的值,会影响到Service_names,也会影响到动态监听的service_name,因此,也应修改tnsnames.ora文件中service_name的服务名,否则,即使tnsping能通,但无法提供相应的服务。
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