hint

问题 Say I have a table in a SQL 2005 database with 2,000,000+ records and a few indexes. What advantage is there to using index hints in my queries? Are there ever disadvantages to using index hints in queries? 回答1: First, try using SQL Profiler to generate a .trc file of activity in your database for a normal workload over a few hours. And then use the "Database Engine Tuning Advisor" on the SQL Server Management Studio Tools menu to see if it suggests any additional indexes, composite indexes,

问题 Say I have a table in a SQL 2005 database with 2,000,000+ records and a few indexes. What advantage is there to using index hints in my queries? Are there ever disadvantages to using index hints in queries? 回答1: First, try using SQL Profiler to generate a .trc file of activity in your database for a normal workload over a few hours. And then use the "Database Engine Tuning Advisor" on the SQL Server Management Studio Tools menu to see if it suggests any additional indexes, composite indexes,

问题 I opened this demo in Delphi Seattle and it works like it should. When I open my program, and include the demo form it doesnt work. I cannot add hints to my controls. procedure TMainForm.FormCreate(Sender: TObject); application.ShowHint:=true; application.OnHint :=OnApplicationHint; end; procedure TMainForm.OnApplicationHint(Sender: TObject); begin caption := (Application.Hint); end; My program is converted from XE7 to Seattle. So what could be the difference? Where can i find the code that

问题 I've re-posted this question to focus more tightly on the specific error, and to better enumerate what I've already tried. I'm trying to parse some Haskell code during the runtime of a Haskell program using the hint package. The outer program compiles, but when I run it the inner compilation step fails. I'm getting a description of what I assume is a syntax problem, and a location in the "interactive" code, but I have no idea how to view the code in question. Here's Main.hs module Main where

问题 I have the following code trying to show a hint: procedure TMyGrid.OnGridMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer); var aPoint: TPoint; begin inherited; //Application.Hint := 'Hint Text'; //Application.ShowHint := True; Grid.Hint := 'Hint Text'; Grid.ShowHint := True; aPoint.X := X; aPoint.Y := Y; Application.ActivateHint(aPoint); end; But there is no hint appears. What's wrong? 回答1: ActivateHint wants your point in screen coordinates, not in client coordinates. From doc:

问题 I have the following code trying to show a hint: procedure TMyGrid.OnGridMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer); var aPoint: TPoint; begin inherited; //Application.Hint := 'Hint Text'; //Application.ShowHint := True; Grid.Hint := 'Hint Text'; Grid.ShowHint := True; aPoint.X := X; aPoint.Y := Y; Application.ActivateHint(aPoint); end; But there is no hint appears. What's wrong? 回答1: ActivateHint wants your point in screen coordinates, not in client coordinates. From doc:

问题 The bounty expires in 3 days . Answers to this question are eligible for a +50 reputation bounty. ShapeOfMatter wants to draw more attention to this question: “I'm still not sure how to move forward on this.” I'm trying to compile Polysemy monad values at runtime using Hint (Language.Haskell.Interpreter). When I try to do this I reliably get an error about improper use of the : operator in "interactive" code; it seems as if the text hint is passing to GHC has a syntax error in it. {-#

问题 The bounty expires in 3 days . Answers to this question are eligible for a +50 reputation bounty. ShapeOfMatter wants to draw more attention to this question: “I'm still not sure how to move forward on this.” I'm trying to compile Polysemy monad values at runtime using Hint (Language.Haskell.Interpreter). When I try to do this I reliably get an error about improper use of the : operator in "interactive" code; it seems as if the text hint is passing to GHC has a syntax error in it. {-#

问题 Using a plugin such as watermark.js for adding the greyed out hint text in the search field of the Jquery datatable is not an option, I have to custom write it. I am almost there but facing this minor and strange issue explained below the following code snippet. function toggleHintText() { // alert("The hint text should show up"); var textSuggest = "Please input search parameter"; var searchField = $('input:text'); searchField .attr("value", textSuggest ); searchField .addClass("activeHint");

问题 If I run a mongo query from the shell with explain(), get the name of the index used and then run the same query again, but with hint() specifying the same index to be used - "millis" field from explain plan is decreased significantly for example no hint provided: >>db.event.find({ "type" : "X", "active" : true, "timestamp" : { "$gte" : NumberLong("1317498259000") }, "count" : { "$gte" : 0 } }).limit(3).sort({"timestamp" : -1 }).explain(); { "cursor" : "BtreeCursor my_super_index", "nscanned"