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  • Fast data retrieval in MySQL

    - by trojanwarrior3000
    I have a table of users - It contains around millions of rows (user-id is the primary key). I just want to retrieve user-id and their joining date. Using SELECT user-id, joining-date FROM users requires lot of time. Is there a fast way to query/retrieve the same data from this table?

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  • B-trees, databases, sequential inputs, and speed.

    - by IanC
    I know from experience that b-trees have awful performance when data is added to them sequentially (regardless of the direction). However, when data is added randomly, best performance is obtained. This is easy to demonstrate with the likes of an RB-Tree. Sequential writes cause a maximum number of tree balances to be performed. I know very few databases use binary trees, but rather used n-order balanced trees. I logically assume they suffer a similar fate to binary trees when it comes to sequential inputs. This sparked my curiosity. If this is so, then one could deduce that writing sequential IDs (such as in IDENTITY(1,1)) would cause multiple re-balances of the tree to occur. I have seen many posts argue against GUIDs as "these will cause random writes". I never use GUIDs, but it struck me that this "bad" point was in fact a good point. So I decided to test it. Here is my code: SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[T1]( [ID] [int] NOT NULL CONSTRAINT [T1_1] PRIMARY KEY CLUSTERED ([ID] ASC) ) GO CREATE TABLE [dbo].[T2]( [ID] [uniqueidentifier] NOT NULL CONSTRAINT [T2_1] PRIMARY KEY CLUSTERED ([ID] ASC) ) GO declare @i int, @t1 datetime, @t2 datetime, @t3 datetime, @c char(300) set @t1 = GETDATE() set @i = 1 while @i < 2000 begin insert into T2 values (NEWID(), @c) set @i = @i + 1 end set @t2 = GETDATE() WAITFOR delay '0:0:10' set @t3 = GETDATE() set @i = 1 while @i < 2000 begin insert into T1 values (@i, @c) set @i = @i + 1 end select DATEDIFF(ms, @t1, @t2) AS [Int], DATEDIFF(ms, @t3, getdate()) AS [GUID] drop table T1 drop table T2 Note that I am not subtracting any time for the creation of the GUID nor for the considerably extra size of the row. The results on my machine were as follows: Int: 17,340 ms GUID: 6,746 ms This means that in this test, random inserts of 16 bytes was almost 3 times faster than sequential inserts of 4 bytes. Would anyone like to comment on this? Ps. I get that this isn't a question. It's an invite to discussion, and that is relevant to learning optimum programming.

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  • Meaning of Primary Key to Microsoft SQL Server 2008

    - by usr
    What meaning does the concept of a primary key have to the database engine of SQL Server? I don't mean the clustered/nonclustered index created on the "ID" column, i mean the constraint object "primary key". Does it matter if it exists or not? Alternatives: alter table add primary key clustered alter table create clustered index Does it make a difference?

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  • setting target for disclosure button on subclassed UITableViewCell

    - by Toby Wilson
    I've created a subclass of UITableViewCell to create some custom appearance and UI functionality ('swipe to reveal delete button'). Some of the cells are disclosure/detail disclosure type, and have a UIButtonTypeDetailDisclosure etc added manually. I cannot use the table view controllers' UITableViewCellAccessory for row at index path method. The question is, how do I set the target of these manually added buttons so that they correctly send the didSelectRowAtIndexPath to their table view controller?

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  • FluentNHibernate Many-To-One References where Foreign Key is not to Primary Key and column names are

    - by Todd Langdon
    I've been sitting here for an hour trying to figure this out... I've got 2 tables (abbreviated): CREATE TABLE TRUST ( TRUSTID NUMBER NOT NULL, ACCTNBR VARCHAR(25) NOT NULL ) CONSTRAINT TRUST_PK PRIMARY KEY (TRUSTID) CREATE TABLE ACCOUNTHISTORY ( ID NUMBER NOT NULL, ACCOUNTNUMBER VARCHAR(25) NOT NULL, TRANSAMT NUMBER(38,2) NOT NULL POSTINGDATE DATE NOT NULL ) CONSTRAINT ACCOUNTHISTORY_PK PRIMARY KEY (ID) I have 2 classes that essentially mirror these: public class Trust { public virtual int Id {get; set;} public virtual string AccountNumber { get; set; } } public class AccountHistory { public virtual int Id { get; set; } public virtual Trust Trust {get; set;} public virtual DateTime PostingDate { get; set; } public virtual decimal IncomeAmount { get; set; } } How do I do the many-to-one mapping in FluentNHibernate to get the AccountHistory to have a Trust? Specifically, since it is related on a different column than the Trust primary key of TRUSTID and the column it is referencing is also named differently (ACCTNBR vs. ACCOUNTNUMBER)???? Here's what I have so far - how do I do the References on the AccountHistoryMap to Trust??? public class TrustMap : ClassMap<Trust> { public TrustMap() { Table("TRUST"); Id(x => x.Id).Column("TRUSTID"); Map(x => x.AccountNumber).Column("ACCTNBR"); } } public class AccountHistoryMap : ClassMap<AccountHistory> { public AccountHistoryMap() { Table("TRUSTACCTGHISTORY"); Id (x=>x.Id).Column("ID"); References<Trust>(x => x.Trust).Column("ACCOUNTNUMBER").ForeignKey("ACCTNBR").Fetch.Join(); Map(x => x.PostingDate).Column("POSTINGDATE"); ); I've tried a few different variations of the above line but can't get anything to work - it pulls back AccountHistory data and a proxy for the Trust; however it says no Trust row with given identifier. This has to be something simple. Anyone? Thanks in advance.

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  • sql server modify error

    - by Jaspal
    hi, i m not able to modify table in SQL server. i m new to databases. use work go alter table employee modify id varchar(20) error message is- Msg 102, Level 15, State 1, Line 1 Incorrect syntax near 'modify' here is an screenshot thanks

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  • sql 2008 metadata modified date

    - by Kumar
    Is there a way to identify the timestamp when an object(table/view/stored proc...) was modified ? there's a refdate in sysobjects but it's always the same as crdate atleast in my case and i know that alter view/alter table/alter proc commands have been run many times post creation

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  • problems with the email body, appearing special characters in emails

    - by tibin mathew
    Hi, I have some issues with my email -body when i send mails I'm using php in my site. My website is a spanish site , when ever i send a mail some special characters are comming in that mail. Always there is an ! mark in that mail, that too in the same place below is the code which i'm using and an email which i got. Code $domain=”http://international.com/”; $subject = "Iinternational :Solicitud de cotización "; $subject = mb_convert_encoding($subject, "UTF-8","AUTO"); $subject = mb_encode_mimeheader($subject); $mail_body ="<table width='719' border='0' align='center'>"; $mail_body .="<tr><td><a href='".$domain."' target='blank' ><img src='".$domain."images/international_s_01.jpg' border='0' width='719' style='border-color=#c8ceae' /></a></td></tr>"; $mail_body .="<tr><td style='padding-left:5px;'><font face='Verdana' size='1px;' color='#6699CC'>Estimado ".$frm_name.",</font></td></tr>"; $mail_body .="<tr><td height='30' align='center' style='padding-left:5px; font-family:Georgia, Times New Roman, Times, serif; color:#006699; font-weight:bold;font-size:20px;'><u>Solicitud de cotización de Información</u></td></tr>"; $mail_body .="<tr><td align='center'><table border='1' width='690' cellpadding='0' cellspacing='0' bordercolor='#800040'><tr><td><table border='0' width='690' cellpadding='0' cellspacing='0'>"; $mail_body .="<tr height='30'><td align='center' valign='middle' style='font-family:Verdana, Arial, Helvetica, sans-serif; color:#6699CC; font-weight:bold; font-size:15px;' width='230'>Nombre del producto</td><td align='center' valign='middle' style='font-family:Verdana, Arial, Helvetica, sans-serif; color:#6699CC; font-weight:bold; font-size:15px;' width='230'>Nombre de la subcategoría</td><td align='center' valign='middle' style='font-family:Verdana, Arial, Helvetica, sans-serif; color:#6699CC; font-weight:bold; font-size:15px;' width='230'>Nombre de la categoría</td></tr>"; $mail_body .="<tr><td align='left' style='font-family:Verdana, Arial, Helvetica, sans-serif;color:#666666;font-weight:normal;font-size:12px;padding-left:5px;' >".$product_name."</td><td style='font-family:Verdana, Arial, Helvetica, sans-serif;color:#666666;font-weight:normal;font-size:12px;padding-left:5px;' >".$sub_category_name."</td><td style='font-family:Verdana, Arial, Helvetica, sans-serif;color:#666666;font-weight:normal;font-size:12px;padding-left:5px;' >".$category_name."</td></tr>"; $mail_body .="</table></td></tr></table></td></tr>"; $mail_body .="<tr><td height='30' style='font-family:Verdana, Arial, Helvetica, sans-serif;color:#666666;font-weight:normal;font-size:12px;' >Gracias<br>Por visitar nuestro sitio y enviarnos su solicitud. Su información de contacto es segura y no será compartida con nadie.<br>Nos pondremos en contacto con usted dentro de 24 horas.</td></tr><tr><td height='20' style='font-family:Verdana, Arial, Helvetica, sans-serif;color:#6699CC;font-weight:bold;font-size:15px;padding-left:5px;' ><FONT face=tahoma color=#000000 size=2><a href='".$domain."'>www. international.com</a></font></td></tr>"; $mail_body .="<tr><td height='3'></td></tr></table>"; //$headers = "From: ".$mail_from."\n"; $mail_body = mb_convert_encoding($mail_body, "UTF-8","AUTO"); mb_language("es"); $headers .= "X-Mailer: PHP/" . phpversion()."\n"; // mailer $headers .= "From: " ."".mb_encode_mimeheader (mb_convert_encoding($mail_from,"UTF-8","AUTO")) ."" ."<".$mail_from."> \n"; $headers .= "Content-Type: text/html; charset=UTF-8";// Mime type////charset=UNICODE-1-1-UTF-8 //$headers .= "Reply-To: ". $email."\n"; // Return path for errors //$headers .= "Content-Transfer-Encoding: 16bit\n"; $success=mail($mail_to, $subject, $mail_body, $headers); $sucess_flag_user = 1;//sent the mail and set the sucess falg to 1 4 the time beigng mail func not called header("Location:./thank-you-quote.php?sucess_flag_admin=".encrypt($sucess_flag_admin )); Email which i received Estimado Thomas, Solicitud de cotización de Información Nombre del producto Nombre de la subcategoría Nombre de la categoría HPDFO - Lente Alta Definición Accesorios VersaLaser® Grac! ias Por visitar nuestro sitio y enviarnos s! u solici tud. Su información de contacto es segura y no será compartida con nadie. Nos pondremos en contacto con usted dentro de 24 horas. www.International.com This is a spanish mail here there are some ! coming inside that mail. I dont now why its comming. Please help me to fix this issue. Thanks in advance

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  • Postgresql: Implicit lock acquisition from foreign-key constraint evaluation

    - by fennec
    So, I'm being confused about foreign key constraint handling in Postgresql. (version 8.4.4, for what it's worth). We've got a couple of tables, mildly anonymized below: device: (id, blah, blah, blah, blah, blah x 50)… primary key on id whooooole bunch of other junk device_foo: (id, device_id, left, right) Foreign key (device_id) references device(id) on delete cascade; primary key on id btree index on 'left' and 'right' So I set out with two database windows to run some queries. db1> begin; lock table device in exclusive mode; db2> begin; update device_foo set left = left + 1; The db2 connection blocks. It seems odd to me that an update of the 'left' column on device_stuff should be affected by activity on the device table. But it is. In fact, if I go back to db1: db1> select * from device_stuff for update; *** deadlock occurs *** The pgsql log has the following: blah blah blah deadlock blah. CONTEXT: SQL statement "SELECT 1 FROM ONLY "public"."device" x WHERE "id" OPERATOR(pg_catalog.=) $1 FOR SHARE OF X: update device_foo set left = left + 1; I suppose I've got two issues: the first is that I don't understand the precise mechanism by which this sort of locking occurs. I have got a couple of useful queries to query pg_locks to see what sort of locks a statement invokes, but I haven't been able to observe this particular sort of locking when I run the update device_foo command in isolation. (Perhaps I'm doing something wrong, though.) I also can't find any documentation on the lock acquisition behavior of foreign-key constraint checks. All I have is a log message. Am I to infer from this that any change to a row will acquire an update lock on all the tables which it's foreign-keyed against? The second issue is that I'd like to find some way to make it not happen like that. I'm ending up with occasional deadlocks in the actual application. I'd like to be able to run big update statements that impact all rows on device_foo without acquiring a big lock on the device table. (There's a lot of access going on in the device table, and it's kind of an expensive lock to get.)

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  • How to use OUTPUT statement inside a SQL trigger?

    - by Jeff Meatball Yang
    From MSDN: If a statement that includes an OUTPUT clause is used inside the body of a trigger, table aliases must be used to reference the trigger inserted and deleted tables to avoid duplicating column references with the INSERTED and DELETED tables associated with OUTPUT. Can someone give me an example of this? I'm not sure if this is correct: create trigger MyInterestingTrigger on TransactionalTable123 AFTER insert, update, delete AS declare @batchId table(batchId int) insert SomeBatch (batchDate, employeeId) output SomeBatch.INSERTED.batchId into @batchId insert HistoryTable select b.batchId, i.col1, i.col2, i.col3 from TransactionalTable123.inserted i cross join @batchId b

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  • translate stored procedure - to Linq2SQL (count, max, group, orderby)

    - by Walter
    I've two tables (1:N) CREATE TABLE master (idMaster int identity (1,1) not null, TheName varchar( 100) null, constraint pk_master primary key(idMaster) clustered) and - CREATE TABLE lnk (idSlave int not null, idMaster int not null, constraint pk_lnk_master_slave(idSlave) primary key clustered) link between Master.idMaster and lnk.idMaster I've a SQL query: select max (master.idMaster) as idMaster, master.theName, count (lnk.idSlave) as freq from lnk inner join master ON lnk.idMaster = master.idMaster Group by master.theName order by freq desc, master.theName I need to translate this T-SQL query to a Linq-to-SQL statement, preferably in C#

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  • Strange problem with NSMutableArray - Possibly some memory corruption

    - by user210504
    Hi! I am trying to update data in a table view using a NSMutableArray. Quite simple :( What is happening is that I get my data from a NSURLConnection Callback, which I parse and store it in an array and call reload data on the table view. The problem is that when cellForRowAtIndexPath is called back by the framework. The array still shows the correct count of the elements but all string objects I had stored earlier are shown as invalid. Any pointers

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  • Converting a list of an Structure into datatable

    - by strakastroukas
    I saw a lot of examples regarding conversion of a list to data-table. I would like to convert a list of structure into a data-table. How can i do that? My structure is like ... Structure MainStruct Dim Ans1 As String Dim Ans2 As String Dim Ans3 As String Dim Skipped As Boolean End Structure and... Dim St As New MainStruct Dim Build As New List(Of MainStruct) I would like to convert the Build to a datatable

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  • database schema explanation of the cakedc tags plugin

    - by Gaurav Sharma
    Hello everyone, I found an awesome tags plugin on cakedc site. This plugin makes your tagging concerns very easy and is able to make anything taggable. Has anyone used it? I find it a bit difficult to understand few things listed below: difference between the name and keyname columns of the tags table. the use of columns 'identifier', 'weight' in tags table Thanks

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  • Symfony sfDoctrinePager with multiple tables

    - by Zoja
    I was wondering how to get this to run. In my application I have a Category table and Product table. I need to have a pager which combines both Categories and Products for display in one list (first categories then products). Is there a way to get this going ? I tried left joining in the pager's query, but doesn't seem to do the trick.

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  • pivots using pyExcelerator/xlrd

    - by Raj N
    How can I go about creating a sheet with a pivot table using python libs like pyExcelerator / xlrd? I need to generate a daily report that has a pivot table to summarize data on other sheets. One option would be to have a blank template that I copy and populate with the data. In this case, is there a way to refresh the pivot from code? Any other suggestions?

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  • Altering constraint delete action

    - by Hobhouse
    I did this: ALTER TABLE `db`.`my_table` ADD CONSTRAINT FOREIGN KEY (`my_second_table_id`) REFERENCES `my_second_table` (`id`); I should have done this: ALTER TABLE `db`.`my_table` ADD CONSTRAINT FOREIGN KEY (`my_second_table_id`) REFERENCES `my_second_table` (`id`) ON DELETE SET NULL; Is it possible to ALTER this, or do I have to drop the constraint and add again?

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  • How do I check for a css value using jQuery?

    - by zeckdude
    After the user clicks on a table row, I want it to check if the table row's background-color is white, and if so, it will change the color to light blue. The code I am using is not working. Here it is: $("#tracker_table tr#master").click(function(){ if($(this).css("background-color") == "#FFFFFF") { $(this).css("background-color", "#C2DAEF"); } }); I think there is something wrong with my if statement. How do I check for a css value using jQuery?

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  • Pound symbol not displaying on web page

    - by Gublooo
    Hello I have a mysql database table to store country name and currency symbol - the CHARSET has correctly set to UTF8. This is example data inserted into the table insert into country ( country_name, currency_name, currency_code, currency_symbol) values ('UK','Pounds','GBP','£'); When I look in the database - the pound symbol appears fine - but when I retrieve it from the database and display it on the website - a weird square symbol shows up with a question mark inside instead of the pound symbol. You can look at it here - http://www.didyouswipe.com/profile/view-profile/user_id/181 Please advice Thanks

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  • UITextView in UITableViewCell scrolling problems.

    - by jrtc27
    Ok. I have made a custom cell for my table, and it contains a text view. When I have multiple lines in the text view, I can scroll up and down, but in doing this the table also scrolls. How can I stop this behaviour? If anyone needs parts of my code or further details, please just ask. I am more than willing. Thank you for your help

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  • MapKit Annotations and User location

    - by teddafan
    Hi all, I followed this tutorial to make my first app: http://icodeblog.com/2009/12/21/introduction-to-mapkit-in-iphone-os-3-0/ I would really like to know how to sort the annotations in the Table in order of distance to the user (the nearest annotation is the first one on the table) How is it possible to do that? I understand that I must use the CLLocation to find the user's location but then I have no idea. Could any one help me? Cheers, Thank you in advance for your much appreciated help, teddafan

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