原创 Q9
Your database is running in archivelog mode. Examine the parameters for you
2020-06-20 03:06:12
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原创 Q2
Q2 Which three statements are true about Flashback Data Archive?A.Flashback
2020-06-20 03:06:02
原创 NO.1-15
NO.1 Which three statements are true about useraccount administration? (Choose three.) A. A user's current session is
2020-06-09 21:13:47
原创 Q1
Which three types of backups can be performed for a database running in NOA
2020-02-22 18:35:28
原创 1Z0-063 FROM B net 1
Q1. Which three requirements must be met before a tablespace can be transpo
2020-02-22 18:35:18
原创 1Z0-063 FROM B net 2
Q2 Which three statements are true about Consolidated Database Replay? A.The workload capture and replay systems must h
2020-02-22 18:35:17
原创 Q7
You use RMAN to take regular backups for your database.Examine the RMAN com
2020-02-22 18:35:17
原创 Q3
Which statement is true about the DUPLICATE command?Examine the RMAN comman
2020-02-22 18:35:17
4
原创 Q4
Your database is running in ARCHIVELOG mode and flashback is enabled.In whi
2020-02-22 18:35:17
原创 Q5
In your database, the user SCOTT wants to retrieve the dropped HR.EMPLOYEES
2020-02-22 18:35:17
原创 12C_ORACLE_1Z0-063 PREP DEMO
1.Which two statements are true about recovering logically corrupted tables
2020-02-22 18:35:17
原创 Q6
Which two are prerequisites for performing Flashback Transaction?A.A supple
2020-02-22 18:35:17
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原创 SQL TUING
20+條MySQL性能優化的最佳經驗 By Lee - Last updated: 星期三, 八月 19, 2015 Leave a Comment 今天，數據庫的操作越來越成爲整個應用的性能瓶頸了，這點對於Web應用尤其明顯。關於數據庫
2019-04-05 01:04:55
原创 查看Oracle執行計劃的幾種常用方法
《查看Oracle執行計劃的幾種常用方法-系列1》(http://blog.csdn.net/bisal/article/details/38919181)這篇博文中曾提到一個隱藏問題： “隱藏問題2： 實驗這部分內容發現使用select
2019-04-05 01:04:34
3
原创 explain plan 執行計劃
explain plan 是sql的執行計劃 。如果一條sql平時執行的好好的，有一天突然變得很差，如果排除系統資源和阻塞的原因，基本可以斷定是執行計劃出現了問題。 執行計劃可以定位sql性能的問題。 2.使用sql語句 EXPLAI
2019-04-05 01:04:34