一份DBA試題註:以下題目,可根據自己情況挑選題目作答,不必全部作答您也可以就相關問題直接找負責面試人員面述而不筆答一:SQL tuning 類1:列舉幾種表串連方式 hash join/merge join/nest loop(cluster join)/index join 2:不藉助第三方工具,怎樣查看sql的執行計畫 set autot on explain plan set statement_id = &item_id for &sql; select *
--監控索引是否使用alter index &index_name monitoring usage;alter index &index_name nomonitoring usage;select * from v$object_usage where index_name = &index_name;--求資料檔案的I/O分布select
Love is in the air and the flowers are on their way為什麼把玫瑰花香瀰漫的那天叫Valentine's Day? February has long been a month of romance. With the sweet smell of roses in the air, romantic films hit cinemas and love stories fill newspapers and
1.PEP218:內建set對象 set對象有點類似於序列對象(str,list,tuple)也是其他對象的容器,但set對象內的元素是不重複的(這和java.util.Set) 語義一致,並且set提供了方便的集合運算功能 >>> a = set('abracadabra') # 從字串建立set對象 >>> 'z' in a # 支援 in
認識RAID磁碟陣列 近年來,硬碟無論在容量、存取速度還是可靠性方面都得到了很大提高,然而這一提高還是跟不上處理器的發展要求,使得硬碟仍然成為電腦系統中的一個瓶頸。為瞭解決應用系統對磁碟高速存取的要求,人們採取了多種措施。1988年,美國加州大學伯克利分校的D.A.Patterson教授提出的廉價冗餘磁碟陣列(Redundant Array of Inexpensive
英文寫作之經典句型(帶例句)一、~~~ the ~ est 名詞 (that) 主詞 have ever seen ( known/heard/had/read, etc) ~~~ the most 形容詞 名詞 (that) 主詞 have ever seen ( known/heard/had/read, etc) 例句:Helen is the most beautiful girl that I have ever seen. 海倫是我所看過最美麗的女孩。 Mr.
apache filter 主要作用是縮小搜尋範圍,在結果返回之前進行過濾,比較典型的場合是某些文檔有多種安全層級,最進階別的文檔不能被搜到。下面是一個例子,作個記錄,以備後用。/***只搜尋句子中單詞數不超過10個的句子*這個需求當然可以採用NumericRangeQuery來實現,這裡的Filter只是做個簡單例子*True 文檔返回;false:文檔不返回*/public class CustomFilter extends Filter{ public static final
Artist: Richard Marx Song: Now and Forever Whenever I'm weary from the battles that rage in my head You make sense of madness when my sanity hangs by a thread I lose my way but still you seam to understand Now and forever I will be
我喜歡的marilyn manson~~ Lest We Forget -- The Best Of (CD Only) Marilyn Manson unleashes a compilation of songs that made him the most controversial rock star in the world today. Track listing: 1. The Love Song 2. Personal Jesus 3. mOBSCENE 4. The