哈希索引 的英文怎麼說
中文拼音 [hāxīsuǒyǐn]
哈希索引
英文
hash index- 哈 : 哈構詞成分。
- 希 : Ⅰ動詞(希望) hope Ⅱ形容詞(事物出現得少) rare; scarce; uncommonⅢ名詞(姓氏) a surname
- 索 : Ⅰ名詞1 (大繩子; 大鏈子) a large rope 2 (姓氏) a surname Ⅱ動詞1 (搜尋; 尋找) search 2 (要; ...
- 引 : Ⅰ動詞1 (牽引; 拉) draw; stretch 2 (引導) lead; guide 3 (離開) leave 4 (伸著) stretch 5 (...
- 哈希 : hachi
- 索引 : index; indexing; key; repertory; subscript; concordance
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Dbpropval it btree - the index is a b - tree. dbpropval it hash - the index is a hash file using, for example, linear or extensible hashing
Dbpropval _ it _ hash -該索引是使用例如線性或可擴展哈希演算法的哈希文件。The optimizer will choose dynamic hash join if none of the joined columns has index
如果連接列上不存在索引,那麼優化器將選擇動態哈希連接。In the previous example, if customer. customer num and orders. customer num are not indexed, dynamic hash join would be chosen by the optimizer as the best execution plan. the optimizer will choose nested - loop joins if
在前一個實例中,如果customer . customer _ num和orders . customer _ num都沒有被索引,那麼優化器將選擇動態哈希連接來作為最佳的執行計劃。The other is schema path look - up hash table index. it is used to evaluate absolute paths for general regular path expressions, such as relative path expressions, so as to relieve the workload of large scale of navigation and speed up queries
此外,為了解決主索引對于相對路徑查詢需要大規模遍歷的問題,我們設計了模式路徑哈希表作為輔助索引,用於在主索引執行相對路徑查找之前計算相對路徑查詢的絕對路徑,使主索引的遍歷負荷大大減輕,從而使相對查詢的效率提高。( 4 ) facing the data volume we faced are enormous, full of noise and different possible meanings, textminer chooses some data structures, such as hash set, cross indexing, and other redundant measures for the time performance trade - off
由於中文文本處理面對的文檔個體數據量大、噪聲多、語義歧義充斥,幾xtminer選擇了較為合理的數據結構,如哈希存儲、雙向索引和適當的冗餘存儲方案用於處理時間性能的改善。分享友人