今日分享，今天在銀行待了一天，明天可以休息一下了，祝大家周末愉快！

如果大家看到以下幾種寫法，大家會(huì)有什么想法？有什么區(qū)別？
告訴大家，這幾種寫法默認(rèn)都可以登錄到數(shù)據(jù)庫的。

站在用戶的角度思考問題，與客戶深入溝通，找到黃陂網(wǎng)站設(shè)計(jì)與黃陂網(wǎng)站推廣的解決方案，憑借多年的經(jīng)驗(yàn)，讓設(shè)計(jì)與互聯(lián)網(wǎng)技術(shù)結(jié)合，創(chuàng)造個(gè)性化、用戶體驗(yàn)好的作品，建站類型包括：網(wǎng)站設(shè)計(jì)、成都網(wǎng)站設(shè)計(jì)、企業(yè)官網(wǎng)、英文網(wǎng)站、手機(jī)端網(wǎng)站、網(wǎng)站推廣、域名注冊、雅安服務(wù)器托管、企業(yè)郵箱。業(yè)務(wù)覆蓋黃陂地區(qū)。

<rac01:orcl1:/home/oracle>$sqlplus xxx/xxx as sysdba
<rac01:orcl1:/home/oracle>$sqlplus roidba/roidba as sysdba
<rac01:orcl1:/home/oracle>$sqlplus / as sysdba
<rac01:orcl1:/home/oracle>$sqlplus '！@#/!!! as sysdba'

這里有幾個(gè)小知識(shí)點(diǎn)值得注意。
1、Oracle 默認(rèn)使用系統(tǒng)認(rèn)證，登錄數(shù)據(jù)庫
2、單引號(hào)在這里強(qiáng)調(diào)忽略所有特殊字符，這就是為什么有時(shí)候我們需要單引號(hào)，而有的時(shí)候不需要。

我們在做數(shù)據(jù)庫備份的時(shí)候，有的時(shí)候用sys,有的時(shí)候用system,有的時(shí)候有業(yè)務(wù)用戶來做邏輯備份，而我又不想把密碼暴露出來的話，怎么辦呢？
有不少朋友就是使用了expdp \'/ as sysdba\'
例如

<rac01:orcl1:/home/oracle>$expdp \'/ as sysdba\' 

Export: Release 12.1.0.2.0 - Production on Fri Dec 15 22:42:17 2017

Copyright (c) 1982, 2014, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_01":  "/******** AS SYSDBA" 
Estimate in progress using BLOCKS method...
Total estimation using BLOCKS method: 0 KB
Processing object type SCHEMA_EXPORT/STATISTICS/MARKER
ORA-31655: no data or metadata objects selected for job
Job "SYS"."SYS_EXPORT_SCHEMA_01" completed with 1 error(s) at Fri Dec 15 22:42:43 2017 elapsed 0 00:00:24

哪里來的xxx用戶，別被忽悠了哈

<rac01:orcl1:/home/oracle>$sqlplus xxx/xxx as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Fri Dec 15 22:44:20 2017

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options

SYS@orcl1> select user from dual;

USER
------------------------------
SYS

哪里來的！@#用戶哈，這下大家應(yīng)該理解了吧，眼見不一定為實(shí)，自己動(dòng)手測試驗(yàn)證了，才能得出最終的結(jié)論。

<rac01:orcl1:/home/oracle>$sqlplus '！@#/!!! as sysdba'

SQL*Plus: Release 12.1.0.2.0 Production on Fri Dec 15 22:45:35 2017

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options

SYS@orcl1> select user from dual;

USER
------------------------------
SYS

SYS@orcl1> 

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