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  • Why does this query only select a single row?

    - by Joe
    SELECT * FROM tbl_houses WHERE (SELECT HousesList FROM tbl_lists WHERE tbl_lists.ID = '123') LIKE CONCAT('% ', tbl_houses.ID, '#') It only selects the row from tbl_houses of the last occuring tbl_houses.ID inside tbl_lists.HousesList I need it to select all the rows where any ID from tbl_houses exists within tbl_lists.HousesList

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  • Stored procedure error when use computed column for ID

    - by Hari
    I got the error: Procedure or function usp_User_Info3 has too many arguments specified When I run the program. I don't know the error in SP or in C# code. I have to display the Vendor_ID after the user clicks the submit button. Where the thing going wrong here ? Table structure : CREATE TABLE User_Info3 ( SNo int Identity (2000,1) , Vendor_ID AS 'VEN' + CAST(SNo as varchar(16)) PERSISTED PRIMARY KEY, UserName VARCHAR(16) NOT NULL, User_Password VARCHAR(12) NOT NULL, User_ConPassword VARCHAR(12) NOT NULL, User_FirstName VARCHAR(25) NOT NULL, User_LastName VARCHAR(25) SPARSE NULL, User_Title VARCHAR(35) NOT NULL, User_EMail VARCHAR(35) NOT NULL, User_PhoneNo VARCHAR(14) NOT NULL, User_MobileNo VARCHAR(14)NOT NULL, User_FaxNo VARCHAR(14)NOT NULL, UserReg_Date DATE DEFAULT GETDATE() ) Stored Procedure : ALTER PROCEDURE [dbo].[usp_User_Info3] @SNo INT OUTPUT, @Vendor_ID VARCHAR(10) OUTPUT, @UserName VARCHAR(30), @User_Password VARCHAR(12), @User_ConPassword VARCHAR(12), @User_FirstName VARCHAR(25), @User_LastName VARCHAR(25), @User_Title VARCHAR(35), @User_OtherEmail VARCHAR(30), @User_PhoneNo VARCHAR(14), @User_MobileNo VARCHAR(14), @User_FaxNo VARCHAR(14) AS BEGIN SET NOCOUNT ON; INSERT INTO User_Info3 (UserName,User_Password,User_ConPassword,User_FirstName, User_LastName,User_Title,User_OtherEmail,User_PhoneNo,User_MobileNo,User_FaxNo) VALUES (@UserName,@User_Password,@User_ConPassword,@User_FirstName,@User_LastName, @User_Title,@User_OtherEmail,@User_PhoneNo,@User_MobileNo,@User_FaxNo) SET @SNo = Scope_Identity() SELECT Vendor_ID From User_Info3 WHERE SNo = @SNo END C# Code : protected void BtnUserNext_Click(object sender, EventArgs e) { cmd.CommandType = CommandType.StoredProcedure; cmd.CommandText = "usp_User_Info3"; System.Data.SqlClient.SqlParameter SNo=cmd.Parameters.Add("@SNo",System.Data.SqlDbType.Int); System.Data.SqlClient.SqlParameter Vendor_ID=cmd.Parameters.Add("@Vendor_ID", System.Data.SqlDbType.VarChar,10); cmd.Parameters.Add("@UserName", SqlDbType.VarChar).Value = txtUserName.Text; cmd.Parameters.Add("@User_Password", SqlDbType.VarChar).Value = txtRegPassword.Text; cmd.Parameters.Add("@User_ConPassword", SqlDbType.VarChar).Value = txtRegConPassword.Text; cmd.Parameters.Add("@User_FirstName", SqlDbType.VarChar).Value = txtRegFName.Text; cmd.Parameters.Add("@User_LastName", SqlDbType.VarChar).Value = txtRegLName.Text; cmd.Parameters.Add("@User_Title", SqlDbType.VarChar).Value = txtRegTitle.Text; cmd.Parameters.Add("@User_OtherEmail", SqlDbType.VarChar).Value = txtOtherEmail.Text; cmd.Parameters.Add("@User_PhoneNo", SqlDbType.VarChar).Value =txtRegTelephone.Text; cmd.Parameters.Add("@User_MobileNo", SqlDbType.VarChar).Value =txtRegMobile.Text; cmd.Parameters.Add("@User_FaxNo", SqlDbType.VarChar).Value =txtRegFax.Text; cmd.Connection = SqlCon; try { Vendor_ID.Direction = System.Data.ParameterDirection.Output; SqlCon.Open(); cmd.ExecuteNonQuery(); string VendorID = cmd.ExecuteScalar() as string; } catch (Exception ex) { throw new Exception(ex.Message); } finally { string url = "../CompanyBasicInfo.aspx?Parameter=" + Server.UrlEncode(" + VendorID + "); SqlCon.Close(); } }

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  • Trying to Understand PLSQL Function

    - by Rachel
    I am new to PLSQL and I have this huge plsql function which am trying to understand and am having hard time understanding the flow and so I would really appreciate if anyone can run me through the big pieces so that I can understand the flow. Guidance would be highly appreciated. FUNCTION monthly_analysis( REGION_ID_P VARCHAR2, COUNTRY_ID_P VARCHAR2 , SUB_REGION_ID_P VARCHAR2 , CUSTOMER_TYPE_ID_P VARCHAR2 , RECEIVED_FROM_DATE_P VARCHAR2 , RECEIVED_TO_DATE_P VARCHAR2, CUSTOMER_ID_P VARCHAR2 , PRIORITY_ID_P VARCHAR2, WORK_GROUP_ID_P VARCHAR2, CITY_ID_P VARCHAR2, USER_ID_P VARCHAR2 ) RETURN AP_ANALYSIS_REPORT_TAB_TYPE pipelined IS with_sql LONG; e_sql LONG; where_sql LONG; group_by_sql LONG; curent_date Date; v_row AP_ANALYSIS_REPORT_ROW_TYPE := AP_ANALYSIS_REPORT_ROW_TYPE( NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL ); TYPE rectyp IS REF CURSOR; -- define weak REF CURSOR type rrc_rectyp rectyp; TYPE recordvar IS RECORD( MONTHS VARCHAR2(100), ORDERBY_MONTHS VARCHAR2(100), REQ_RECEIVED NUMBER(9,2), REQ_STILL_OPEN NUMBER(9,2), REQ_AWAIT_ACCEPTANCE NUMBER(9,2), REQ_WITH_ATT NUMBER(9,2), REQ_CLOSED NUMBER(9,2), REQ_CANCELLED NUMBER(9,2) ); res_rec recordvar; BEGIN select sysdate +substr(to_char(systimestamp, 'tzr'),3,1)/24 into curent_date from dual; where_sql := ' AND 1=1 '; IF COUNTRY_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.country_id ='|| COUNTRY_ID_P; END IF; IF SUB_REGION_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.SUB_REGION_ID ='|| SUB_REGION_ID_P; END IF; IF CUSTOMER_TYPE_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.CUSTOMER_TYPE_ID ='|| CUSTOMER_TYPE_ID_P; END IF; IF RECEIVED_FROM_DATE_P IS NOT NULL THEN where_sql := where_sql||' AND convert_time(received_date, ''GMT'', ''GMT'') >= convert_time(trunc(to_date('''||RECEIVED_FROM_DATE_P||''',''dd/mm/yyyy HH24:MI:SS'')), ''Europe/Paris'', ''GMT'')'; END IF; IF RECEIVED_TO_DATE_P IS NOT NULL THEN where_sql := where_sql||' AND convert_time(received_date, ''GMT'', ''GMT'') <= convert_time(trunc(to_date('''||RECEIVED_TO_DATE_P||''',''dd/mm/yyyy HH24:MI:SS'')), ''Europe/Paris'', ''GMT'')'; END IF; IF CUSTOMER_ID_P IS NOT NULL THEN where_sql := where_sql||' AND x.CUSTOMER_ID in(select CUSTOMER_ID from lk_customer where upper(CUSTOMER_NAME) like upper('''||CUSTOMER_ID_P||'%''))'; END IF; IF PRIORITY_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.PRIORITY_ID ='|| PRIORITY_ID_P; END IF; IF WORK_GROUP_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.WORKGROUP_ID ='|| WORK_GROUP_ID_P; END IF; IF CITY_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.CITY_ID = ' || CITY_ID_P; END IF; group_by_sql := ' group by to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''mm/YYYY''),to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''yyyy/mm'')'; with_sql := 'with b AS (select cep_work_item_no from ap_main where req_accept_date is null and ecep_ap_utils.f_business_days(received_date,'''||curent_date||''')>30), e AS (select cep_work_item_no from ap_main where status_id=1 and req_accept_date is not null and stage_ID != 10 and stage_Id !=4 and ecep_ap_utils.f_business_days(received_date,'''||curent_date||''')>30), --f AS (select cep_work_item_no from ap_main where received_date is not null), m AS (select cep_work_item_no from ap_main where received_date is not null and status_id=1), n AS (select cep_work_item_no from ap_main where status_id=2), o AS (select cep_work_item_no from ap_main where status_id=3)'; --e_sql := ' SELECT MONTHS, REQ_RECEIVED,REQ_STILL_OPEN, REQ_AWAIT_ACCEPTANCE, REQ_WITH_ATT from ('; --e_sql := with_sql; e_sql := with_sql||' select to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''mm/YYYY'') MONTHS, to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''yyyy/mm'') ORDERBY_MONTHS, count(x.cep_work_item_no) REQ_RECEIVED, count(m.cep_work_item_no) REQ_STILL_OPEN,count(b.cep_work_item_no) REQ_AWAIT_ACCEPTANCE,count(e.cep_work_item_no) REQ_WITH_ATT, count(n.cep_work_item_no) REQ_CLOSED, count(o.cep_work_item_no) REQ_CANCELLED from emea_main x,m,b,e,n,o where x.cep_work_item_no=m.cep_work_item_no(+) and x.cep_work_item_no = b.cep_work_item_no(+) and x.cep_work_item_no=e.cep_work_item_no(+) and x.cep_work_item_no=n.cep_work_item_no(+) and x.cep_work_item_no=o.cep_work_item_no(+) and x.received_date is not null'; e_sql := e_sql|| where_sql||group_by_sql; OPEN rrc_rectyp FOR e_sql; LOOP FETCH rrc_rectyp INTO res_rec; EXIT WHEN rrc_rectyp%NOTFOUND; v_row.MONTHS := res_rec.MONTHS ; v_row.ORDERBY_MONTHS := res_rec.ORDERBY_MONTHS ; v_row.REQ_RECEIVED := res_rec.REQ_RECEIVED; v_row.REQ_STILL_OPEN := res_rec.REQ_STILL_OPEN; v_row.REQ_AWAIT_ACCEPTANCE := res_rec.REQ_AWAIT_ACCEPTANCE; v_row.REQ_WITH_ATT := res_rec.REQ_WITH_ATT; v_row.REQ_CLOSED := res_rec.REQ_CLOSED; v_row.REQ_CANCELLED := res_rec.REQ_CANCELLED; pipe ROW(v_row); END LOOP; RETURN; END monthly_analysis; And would also appreciate if someone can let me know as to what are the important plsql concepts used here so that I can go ahead and understand them in a better way and some small explanation would go long way. As suggested by dcp, i am trying to use debugger, again I have not used it before and so pardon me, here is what am getting: DECLARE REGION_ID_P VARCHAR2(200); COUNTRY_ID_P VARCHAR2(200); SUB_REGION_ID_P VARCHAR2(200); CUSTOMER_TYPE_ID_P VARCHAR2(200); RECEIVED_FROM_DATE_P VARCHAR2(200); RECEIVED_TO_DATE_P VARCHAR2(200); CUSTOMER_ID_P VARCHAR2(200); PRIORITY_ID_P VARCHAR2(200); WORK_GROUP_ID_P VARCHAR2(200); CITY_ID_P VARCHAR2(200); USER_ID_P VARCHAR2(200); v_Return GECEPDEV.AP_ANALYSIS_REPORT_TAB_TYPE; BEGIN REGION_ID_P := NULL; COUNTRY_ID_P := NULL; SUB_REGION_ID_P := NULL; CUSTOMER_TYPE_ID_P := NULL; RECEIVED_FROM_DATE_P := NULL; RECEIVED_TO_DATE_P := NULL; CUSTOMER_ID_P := NULL; PRIORITY_ID_P := NULL; WORK_GROUP_ID_P := NULL; CITY_ID_P := NULL; USER_ID_P := NULL; v_Return := ECEP_AP_REPORTS.MONTHLY_ANALYSIS( REGION_ID_P => REGION_ID_P, COUNTRY_ID_P => COUNTRY_ID_P, SUB_REGION_ID_P => SUB_REGION_ID_P, CUSTOMER_TYPE_ID_P => CUSTOMER_TYPE_ID_P, RECEIVED_FROM_DATE_P => RECEIVED_FROM_DATE_P, RECEIVED_TO_DATE_P => RECEIVED_TO_DATE_P, CUSTOMER_ID_P => CUSTOMER_ID_P, PRIORITY_ID_P => PRIORITY_ID_P, WORK_GROUP_ID_P => WORK_GROUP_ID_P, CITY_ID_P => CITY_ID_P, USER_ID_P => USER_ID_P ); -- Modify the code to output the variable -- DBMS_OUTPUT.PUT_LINE('v_Return = ' || v_Return); END; Can anyone guide me through this query and its goal ?

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  • Select Statements in Jobs

    - by Andrew Vogel
    I have inherited a few jobs and I am trying to understand why select statements would be in their steps. I would think that select statements would be pointless in an automated job that displays nothing for an end user.

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  • Repository vs Data Access

    - by vdh_ant
    Hi guys In the context of the n-tier application, is there a difference between what you would consider your data access classes to be and your repositories? I tend to think yes but I just wanted to see what other thought. My thinking is that the job of the repository is just to contain and execute the raw query itself, where as the data access class would create the context, execute the repository (passing in the context), handle mapping the data model to the domain model and return the result back up... What do you guys think? Also do you see any of this changing in a Linq to XML scenario (assuming that you change the context for the relevant XDocument)? Cheers Anthony

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  • have we limitation in submit some query in c# to oracle

    - by rima
    Can I send this query from my C# connection to my oracle connection? "Select Object_name,status from object_name where object_type='function';" or "Select Object_name,status from object_name where object_type='Procedure';" or because as I remember, I have this problem when I write a program to connect to Access with java,those days I try to submit some query to get all table name. regard.

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  • T-SQL: Build Nested Set From Parent-Child Relationship

    - by Peder Rice
    I have a table that stores my Customer hierarchy with a nested set (due to the specific design of the application, I wasn't able to leverage just a Customer/Parent Customer mapping table). To simplify maintenance of this table, I've built a couple of stored procedures to handle moving nodes around and creating new nodes, but it's significantly more work than maintaining a Customer/Parent Customer table. Further, these structures are very fragile. So I'm looking for a way to have a Customer/Parent Customer table and then convert that table to a nested set on demand. Does anyone have a link to such an implementation?

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  • mysql - speedup regex

    - by Uwe
    I have a table: +--------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------+------------------+------+-----+---------+----------------+ | idurl | int(11) | NO | PRI | NULL | auto_increment | | idsite | int(10) unsigned | NO | MUL | NULL | | | url | varchar(2048) | NO | | NULL | | +--------+------------------+------+-----+---------+----------------+ the select statement is: SELECT idurl, url FROM URL WHERE idsite = 34 AND url REGEXP '^https\\://www\\.domain\\.com/checkout/step_one\\.php.*' The query needs 5 seconds on a table with 1000000 rows. Can I achieve a speedup with indexes or something else?

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  • stored procedure to find value in 2 columns out of 3

    - by user1510533
    I am putting in the samle date and i am supposed to do something similar what i am asking. I want to run a query that would pull values in any two columns out 3 if it has a 1 or if any one column has a 1 it will return just those results. However it should search all three columns and in any of the three columns where it found value as 1 it should return that result. Can anyone please help me with this. Thanks in advance. ID Patient Patient Name prio prio2 prio3 ------------------------------------------------- 1 101563 Robert Riley 1 1 1 2 101583 Cody Ayers 1 0 1 3 101825 Jason Lawler 0 0 1 4 101984 Dustin Lumis 1 0 0 5 102365 Stacy smith 1 0 0 6 102564 Frank Milon 1 0 0 7 102692 Thomas Kroning 1 0 0 8 102856 Andrew Philips 1 0 0 9 102915 Alice Davies 0 0 1 10 103785 Jon Durley 0 0 1 11 103958 Clayton Folsom 1 1 1 12 104696 Michelle Holsley 1 1 1 13 104983 Teresa Jones 1 0 1 14 105892 Betsy Prat 1 1 0 15 106859 Casey Ayers 1 1 0

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  • (N)Hibernate: deleting orphaned ternary association rows when either associated row is deleted.

    - by anthony
    I have a ternary association table created using the following mapping: <map name="Associations" table="FooToBar"> <key column="Foo_id"/> <index-many-to-many class="Bar" column="Bar_id"/> <element column="AssociationValue" /> </map> I have 3 tables, Foo, Bar, and FooToBar. When I delete a row from the Foo table, the associated row (or rows) in FooToBar is automatically deleted. This is good. When I delete a row from the Bar table, the associated row (or rows) in FooToBar remain, with a stale reference to a Bar id that no longer exists. This is bad. How can I modify my hbm.xml to remove stale FooToBar rows when deleting from the Bar table?

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  • Active Record/ORM vs Normal Forms?

    - by Arsenal
    Hello, I've been playing around with Active Record a bit, and I have noticed that A.C./ORM always uses the following database model when creating a one-to-one relationship Person id | country_id | name | ... Country id | tld | name | ... No I wondered, isn't this a violiation of the third Normal Form? This clearly states "Every non-prime attribute is non-transitively dependent on every key of the table". Well this country_id isn't dependent of personid is it? So is this wrong or am I just not getting the point?

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  • How do you compare dates in a LINQ query?

    - by Gina
    I am tring to compare a date from a asp calendar control to a date in the table.... here's what i have... it doesn't like the == ? var query = from details in db.TD_TravelCalendar_Details where details.StartDate == calStartDate.SelectedDate && details.EndDate == calEndDate.SelectedDate select details;

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  • Hmm, why finding by '2' or '2' return the same record?

    - by SXLee
    Hi everyone, forget my newbie question, but why finding by '2' or '2' in Mysql returns the same record? For example: Say I have a record with string field named 'slug', and the value is '2'. And the following SQLs returns same record. SELECT * From articles WHERE slug='2' SELECT * From articles WHERE slug='2'

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  • SYSDATE - 1 error on pl/sql function

    - by ayo
    Hi curtisk/all, I have an issue: when i issue this function below ti gives me the following error: select 'EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LOGFILENAME =>'''||name||'''||,OPTIONS=>DBMS_LOGMNR.NEW);' from v\$archived_log where name is not null; select 'EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LOGFILENAME =>'''||name||'''||,OPTIONS=>DBMS_LOGMNR.ADDFILE);' from v\$archived_log where name is not null; EXECUTE DBMS_LOGMNR.START_LOGMNR( STARTTIME => SYSDATE - 1, ENDTIME => SYSDATE, OPTIONS => DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG + DBMS_LOGMNR.CONTINUOUS_MINE + DBMS_LOGMNR.COMMITTED_DATA_ONLY + DBMS_LOGMNR.PRINT_PRETTY_SQL); Error: * ERROR at line 1: ORA-01291: missing logfile ORA-06512: at "SYS.DBMS_LOGMNR", line 58 ORA-06512: at line 1 But i have added all the archived logs for several days before and my sysdate is at today. Kindly help out on this issue. thanks. Reagrds Ayo

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  • Linq like or other construction

    - by Yauhen Kavalenka
    I have DB oracle in my solution. I want to have some results in this query. Query example: select * from doctor where doctor.name like '%IVANOV_A%'; But if i do it at LINQ i cannot get any result. from p in repository.Doctor.Where(x => x.Name.ToLower().Containsname)) select p; Where 'name' is variable of string parameter. Web layout request next string: "Ivanov a" or "A Ivanov" But i suggest for user choose you pattetn for query. How i can to get "patient by name" if name consist of "First name" and "Last name" but user doesn't know your doctor's full name?

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  • Bulk inserting and updating with Entity Framework (Probably a better alternative?)

    - by Dave
    I have a data set of devices, addresses, and companies that I need to import into our database, with the catch that our database may already include a specific device/address/company that is included in the new data set. If that is the case, I need to update that entry with the new information in the data set, excluding addresses. We check if an exact copy of that address exists, otherwise we make a new entry. My issue is that it is very slow to attempt to grab a device/company in EF and if it exist updated it, otherwise insert it. To fix this I tried to get all the companies, devices, and addresses and insert them into respective hashmaps, and check if the identifier of the new data exists in the hashmap. This hasn't led to any performance increases. I've included my code below. Typically I would do a batch insert, I'm not sure what I would do for a batch update though. Can someone advise a different route? var context = ObjectContextHelper.CurrentObjectContext; var oldDevices = context.Devices; var companies = context.Companies; var addresses = context.Addresses; Dictionary<string, Company> companyMap = new Dictionary<string, Company>(StringComparer.OrdinalIgnoreCase); Dictionary<string, Device> deviceMap = new Dictionary<string, Device>(StringComparer.OrdinalIgnoreCase); Dictionary<string, Address> addressMap = new Dictionary<string, Address>(StringComparer.OrdinalIgnoreCase); foreach (Company c in companies) { if (c.CompanyAccountID != null && !companyMap.ContainsKey(c.CompanyAccountID)) companyMap.Add(c.CompanyAccountID, c); } foreach (Device d in oldDevices) { if (d.SerialNumber != null && !deviceMap.ContainsKey(d.SerialNumber)) deviceMap.Add(d.SerialNumber, d); } foreach (Address a in addresses) { string identifier = GetAddressIdentifier(a); if (!addressMap.ContainsKey(identifier)) addressMap.Add(identifier, a); } foreach (DeviceData.TabsDevice device in devices) { // update a device Company tempCompany; Address tempAddress; Device currentDevice; if (deviceMap.ContainsKey(device.SerialNumber)) //update a device deviceMap.TryGetValue(device.SerialNumber, out currentDevice); else // insert a new device currentDevice = new Device(); currentDevice.SerialNumber = device.SerialNumber; currentDevice.SerialNumberTABS = device.SerialNumberTabs; currentDevice.Model = device.Model; if (device.CustomerAccountID != null && device.CustomerAccountID != "") { companyMap.TryGetValue(device.CustomerAccountID, out tempCompany); currentDevice.CustomerID = tempCompany.CompanyID; currentDevice.CustomerName = tempCompany.CompanyName; } if (companyMap.TryGetValue(device.ServicingDealerAccountID, out tempCompany)) currentDevice.CompanyID = tempCompany.CompanyID; currentDevice.StatusID = 1; currentDevice.Retries = 0; currentDevice.ControllerFamilyID = 1; if (currentDevice.EWBFrontPanelMsgOption == null) // set the Panel option to the default if it isn't set already currentDevice.EWBFrontPanelMsgOption = context.EWBFrontPanelMsgOptions.Where( i => i.OptionDescription.Contains("default")).Single(); // link the device to the existing address as long as it is actually an address if (addressMap.TryGetValue(GetAddressIdentifier(device.address), out tempAddress)) { if (GetAddressIdentifier(device.address) != "") currentDevice.Address = tempAddress; else currentDevice.Address = null; } else // insert a new Address and link the device to it (if not null) { if (GetAddressIdentifier(device.address) == "") currentDevice.Address = null; else { tempAddress = new Address(); tempAddress.Address1 = device.address.Address1; tempAddress.Address2 = device.address.Address2; tempAddress.Address3 = device.address.Address3; tempAddress.Address4 = device.address.Address4; tempAddress.City = device.address.City; tempAddress.Country = device.address.Country; tempAddress.PostalCode = device.address.PostalCode; tempAddress.State = device.address.State; addresses.AddObject(tempAddress); addressMap.Add(GetAddressIdentifier(tempAddress), tempAddress); currentDevice.Address = tempAddress; } } if (!deviceMap.ContainsKey(device.SerialNumber)) // if inserting, add to context { oldDevices.AddObject(currentDevice); deviceMap.Add(device.SerialNumber, currentDevice); } } context.SaveChanges();

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  • PostgreSQL, Foreign Keys, Insert speed & Django

    - by Miles
    A few days ago, I ran into an unexpected performance problem with a pretty standard Django setup. For an upcoming feature, we have to regenerate a table hourly, containing about 100k rows of data, 9M on the disk, 10M indexes according to pgAdmin. The problem is that inserting them by whatever method literally takes ages, up to 3 minutes of 100% disk busy time. That's not something you want on a production site. It doesn't matter if the inserts were in a transaction, issued via plain insert, multi-row insert, COPY FROM or even INSERT INTO t1 SELECT * FROM t2. After noticing this isn't Django's fault, I followed a trial and error route, and hey, the problem disappeared after dropping all foreign keys! Instead of 3 minutes, the INSERT INTO SELECT FROM took less than a second to execute, which isn't too surprising for a table <= 20M on the disk. What is weird is that PostgreSQL manages to slow down inserts by 180x just by using 3 foreign keys. Oh, disk activity was pure writing, as everything is cached in RAM; only writes go to the disks. It looks like PostgreSQL is working very hard to touch every row in the referred tables, as 3MB/sec * 180s is way more data than the 20MB this new table takes on disk. No WAL for the 180s case, I was testing in psql directly, in Django, add ~50% overhead for WAL logging. Tried @commit_on_success, same slowness, I had even implemented multi row insert and COPY FROM with psycopg2. That's another weird thing, how can 10M worth of inserts generate 10x 16M log segments? Table layout: id serial primary, a bunch of int32, 3 foreign keys to small table, 198 rows, 16k on disk large table, 1.2M rows, 59 data + 89 index MB on disk large table, 2.2M rows, 198 + 210MB So, am I doomed to either drop the foreign keys manually or use the table in a very un-Django way by defining saving bla_id x3 and skip using models.ForeignKey? I'd love to hear about some magical antidote / pg setting to fix this.

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  • Problem with LINQ in C#

    - by David Bonnici
    I am encountering a problem when using LINQ in C#, I am constantly getting "Specified cast is not valid". This is what I am trying to do. I create a class in which I declare all the columns of the table. [Table(Name="tbl_Aff")] public class Affiliate { [Column] public string name; [Column] public string firstname; [Column] public string surname; [Column] public string title; } I then declare a strongly typed DataContext in which I declare all Table collections as members of the context. public partial class Database : DataContext { public Table affiliate; public Database() : base(Settings.getConnectionString()) { } //This method gets the connection string by reading from an XML file. } public partial class Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Database database = new Database(); try { var q = from a in database.affiliate select a; foreach (var aff in q) // Here I get the error "Specified cast is not valid" { lblMessage.InnerHtml += aff.name + ""; } } catch (Exception ex) { System.Console.WriteLine(ex.Message); } } }

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  • MySQL - are FK's useful / viable in a web app?

    - by yoda
    Hi all, I've encountered this discussion related to FK's and web applications. Basically some people say that FK's in web applications doesn't represent a real improvement and can even make the application slower in some cases. What do you guys think, what's your experience? -- A quote from Heikki Tuuri, creator of InnoDB engine, founder and CEO of Innobase: InnoDB checks foreign keys as soon as a row is updated, no batching is performed or checks delayed till transaction commit Foreign keys are often serious performance overhead, but help maintain data consistency Foreign Keys increase amount of row level locking done and can make it spread to a lot of tables besides the ones directly updated

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  • Continuously checking database from a Windows service

    - by JonF
    I am making a Windows service which needs to continuously check for database entries that can be added at any time to tell it to execute some code. It is looking to see if it's status is set to pending, and it's execute time entry is than the current time. Is the only way to do this to just run select statements over and over? It might need to execute the code every minute which means I need to run the select statement every minute looking for entries in the database. I'm trying to avoid unneccesary cpu time because I'm probably going to end up paying for cpu cycles on the hosting provider

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  • Does the optimizer filter subqueries with outer where clauses

    - by Mongus Pong
    Take the following query: select * from ( select a, b from c UNION select a, b from d ) where a = 'mung' Will the optimizer generally work out that I am filtering a on the value 'mung' and consequently filter mung on each of the queries in the subquery. OR will it run each query within the subquery union and return the results to the outer query for filtering (as the query would perhaps suggest) In which case the following query would perform better : select * from ( select a, b from c where a = 'mung' UNION select a, b from d where a = 'mung' ) Obviously query 1 is best for maintenance, but is it sacrificing much performace for this? Which is best?

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