primary key index的意思
primary key index中文翻譯:
主鍵索引
primary key───主(關)鍵(字);主關鍵字,[計]主鍵標
concatenated primary key───串聯主鍵
multiple primary key defined───定義了多個主鍵
primary───adj.主要的;初級的;基本的;n.原色;最主要者
index───vi.做索引;vt.指出;編入索引中;n.指標;指數;索引;指針
Key───n.鑰匙;關鍵,密鑰;(鍵盤樂器或電腦鍵盤的)鍵;調,聲調,色調;答案;圖例;扳手;銷子,楔,栓;翼果;板條間首層灰泥;(籃球)罰球區;低島,礁;adj.關鍵的,主要的;n.(Key)(美)基(人名);vt.鍵入,用鍵盤輸入;用別針等固定;使與……符合或關聯;使……與……共處,相安無事;用鑰匙將汽車表面劃壞;將(表面)弄粗糙;給(廣告)加識別碼;成為獲得……的關鍵
primary colors───紅、黃、藍三原色;n.紅,黃,藍三原色
yucang primary───初級玉倉
evenness index───均勻性指數
To better illustrate the improvement in cardinality estimation, drop all the existing indexes on the EMPLOYEE table except the primary key index.───為了更好地解釋說明基數估計值的提高,撤銷除主鍵索引外的所有employee表上的現有索引。
Also, before setting up replication in DB2, you will want to ensure that every database table has a primary key or unique index.───此外,在DB 2中創建復制之前,您會希望保證每一個數據庫表都具有一個主鍵或惟一索引。
It queries your database, indexes each column in each row of the result, and ties each index entry to the row's primary key.───它將查詢數據庫,為結果的每行中的每列建立索引,并且將每個索引條目綁定到行的主鍵上。
If the row size is not fixed, every time it needs to do a seek, it has to consult the primary key index.───而如果字段不是定長的,那么,每一次要找下一條的話,需要程序找到主鍵。
The corresponding primary key index permits the retrieval of employee number 390 quickly .───通過對應的主鍵索引,可以快速地檢索到雇員編號390。
Although this lookup is done via the primary key index, it does take CPU cycles to do the search, and possibly I/O to read index page(s) into the buffer pool.
It also permits fast access to data when you use the primary key index in queries.
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