原创 關於戰網BLZBNTBTS0000005D的解決方法
目前正在玩爐石傳說《冠軍的試煉》，今天偶然碰到戰網問題：一直”正在啓動戰網“嘗試了官方論壇的各種方法，如下：1、請確保已開啓Secondary Logon服務；2、請嘗試刪除Battle.net文件夾；3、關閉後臺應用程序/防火牆；4、安全
2019-02-22 21:34:33
原创 STP features之一
spanning-tree features有如下一些： portfast、uplinkfast、backbonefast、BPDU Guard、BPDU filtering、Root Guard、LoopGuard 1)portfas
2019-02-22 21:34:31
原创 Oracle Flashback
1.Flashback query Depend on:content in undo tablespace 1.1Base syntax: 1: SELECT ... FROM ... AS OF TIMESTAMP
2019-02-22 21:34:31
原创 SQL explain plan and AWR
DBMS generates an explain plan for each SQL commands.What does explain plan work for? As is known,it can use ‘full table
2019-02-22 21:34:31
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原创 Database auditing
1.STANDARD AUDITING(FOCUS ON DBA)Standard auditing is enabled by default after installation.It records login,startup,sh
2018-09-11 03:28:42
原创 MSTP之我見
曾經我很天真的以爲MST，只是把多個VLAN捆綁成INSTANCE，省去了PVST每個VLAN都跑生成樹的麻煩，後來才知道，絕不僅僅是這樣。 首先說說MSTP的結構， MSTP採用二級結構。分region跑STP，在同一個region需要滿
2018-09-11 03:28:42
原创 Data Concurrent Experiment(Lock conflict)
There's a stage as below: There are 2 users ngreenberg and smavris,operating at the same time.Smavris' session seems stu
2018-09-11 03:28:42
原创 Oracle Flashback
1.Flashback query Depend on:content in undo tablespace 1.1Base syntax: 1: SELECT ... FROM ... AS OF TIMESTAMP
2018-09-11 03:28:42
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原创 STP features之二
3)backbonefast (摘自china-ccie) 說明： SW3的F0/19失效後，本身無法與外界通信，只有等待SW1的F0/19探測到對端失效後，發送BPDU通知各交換機拓撲改變，這樣SW2纔回切換F0/21
2018-09-11 03:28:42
原创 How ASM instance reads initiator parameter file on ASM disk when startup?
As is known,ASM instance need to read initiator parameter file when startup.However,the diskgroups are not mounted at th
2018-09-11 03:28:42
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原创 Oracle Import and Export
Chapter:SQL*Loader Lab1.Import text file to database assume text file is like this: 1: 60,CONSULTING,TORONTO 2
2018-09-11 03:28:42
原创 Manage Undo Tablespace
Every session has exclusive transaction which has specified undo segment.When you have performed some SQL operations,you
2018-09-11 03:28:42
原创 Why does there exist DB_UNKNOWN directory on ASM disk?
Today I found a glitch about my database instance.When I browsed my files on ASM disks,I found this file,which path was
2018-09-11 03:28:42
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原创 Using Raw Devices in Oracle ASM
Q:When will you use raw devices in ASM?A: 1.There's no approximate asmlib for kernel of your host 2.You wanna prom
2018-09-11 03:28:42
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