我将在Hadoop集群上执行升级,但我想先备份Ambari Metastore架构以防出现任何问题。
Oracle用于存储数据,因此我查看使用expdp
在当前状态下快速备份架构。但是,我在几个不同的文档中看到,它被用来“卸载”数据。这是否意味着在转储过程中数据将从数据库中删除?我希望保留所有内容并进行快速备份,类似于Postgres命令pg_dump
。
答案 0 :(得分:2)
这是一个简单的例子:我导出了Scott的DEPT表。您会在执行EXPDP之前和之后看到数据在表格中。
SQL> select * from dept;
DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
SQL> $expdp scott/tiger@xe tables=dept directory=ext_dir
Export: Release 11.2.0.2.0 - Production on Pon O×u 5 21:21:24 2018
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
Starting "SCOTT"."SYS_EXPORT_TABLE_01": scott/********@xe tables=dept directory=ext_dir
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "SCOTT"."DEPT" 5.929 KB 4 rows
Master table "SCOTT"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SCOTT.SYS_EXPORT_TABLE_01 is:
C:\TEMP\EXPDAT.DMP
Job "SCOTT"."SYS_EXPORT_TABLE_01" successfully completed at 21:21:34
SQL> select * from dept;
DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
SQL>