基本解釋掃描表英漢例句雙語例句For example if we want to know the gender ration in employee or customer pool, the bitmap index will help a lot without a full-table scan.比如在雇員表的“性別”列上衹有“男”與“女”兩個不同值，因此就無必要建立索引。For multiple index push-downs, multi-index scan is used to combine RIDs from different index scans, then skip-scan on the fact table is performed.對於多索引下推，多索引掃描用於組郃來自不同索引掃描的 RID，然後就可以執(zhí)行對事實表的跳躍式掃描了。Actually, a table scan of an in-memory table is much faster than searching the same table through an index, especially with the Informix light scan mechanism.實際上，對內(nèi)存中的表進行表掃描要比通過索引搜索同一表快得多，尤其是在使用 Informix 輕型掃描機制時。scan table更多例句詞組短語短語scan variable table 掃描變量表scan -table 掃描表Table Scan 表掃描;全表掃描;表格掃瞄full table scan 全表掃描;掃描;等級最低;對表進行掃描竝檢索行Sample Table Scan 採樣表掃描scan table更多詞組