optimizer system 中文意思是什麼
optimizer system
解釋
最佳噴油定時自調系統-
The query optimizer treats all internal system tables as if the auto create statistics setting is on, regardless of the actual setting
無論auto _ create _ statistics實際設置情況如何，查詢優化器在處理所有內部系統表時，都按照它被設置為on的情況來處理。 -
The basic software consists of topology analysis, on - line load flow computation, state estimator, security analysis, dispatchers training simulator, short circuit current computation, and voltage / reactive power optimize, etc. the derived softwares consist of load control, capacitor optimizer configuration, transformer and feeder load distribution, impedance computation of generator, etc. network analysis software is powerful dispatch tool, though witch the current state of the power system can be realize, then improve the security and economic potential
Dms網路分析的基本軟體有：網路結線分析、潮流計算、狀態估計、負荷預報、短路電流計算、電壓無功優化等。派生軟體有：負荷控制、電容器優化配置、變壓器與饋線負荷分配、電源阻抗計算等。網路分析軟體是有力的調度工具，通過它可以了解和掌握當前的運行狀態，從而挖掘安全和經濟方面的巨大潛力。 -
The value specified for the communications bandwidth in megabytes per second is used by the sql optimizer to estimate the cost of performing certain operations between partition servers of a partitioned database system
Sql優化器使用為通信帶寬所指定的值（每秒幾兆位元組）來評估在分區數據庫系統中的分區服務器之間執行某些操作的成本。 -
If the optimizer joins two tables first, the join results could be huge and may use a large amount of system resources such as cpu and memory
如果優化器首先連接兩個表，那麼連接結果可能十分龐大，並可能使用大量系統資源，如cpu和內存。 -
To accomplish this, the db2 optimizer applies query cost formulas that evaluate and weigh four factors for each potential access path : the cpu cost, the i o cost, statistical information in the db2 system catalog, and the actual sql statement
要實現這個目標， db2優化器會應用查詢成本公式，該公式對每條可能的存取路徑的四個因素進行評估和權衡： cpu成本、 i / o成本、 db2系統目錄中的統計信息和實際的sql語句。 -
The optimizer uses the following system catalog information as it creates a query plan
當優化器創建查詢計劃時，它將使用下列系統目錄信息：
分享友人