Deletion Query

May 29, 2008

Ok, so I have an issue, was wondering if anybody else has any suggestions.

I have a table that is pretty large, in all regards. It is a "message" table that holds text messages that users send to each other.

1. Has some data fields, integers, dates, some bit columns, a message subject field (varchar(250)), and a message body field (field type = text)
2. Table contains about 70 million records
3. Table has 6 indexes associated to it
4. Table has 2 views associated to it.
5. Table has 8 foreign keys associated to it.

I need to delete, oh, about 90,000 records out of this 70 million record table. I am able to disable the foreign keys to this table for deletion, but that does not seem to mitigate the problem. I think the issue lies with having to update the indexes as well as the views.

When I execute the select statement to retrieve the records I need to delete, it executes pretty quickly, no problems there that I can see.

The issue comes when I try to delete the records, it takes way too long, and we know it. We let it run for an hour and it didn't really get anywhere. This is in a server environment, some pretty decent hardware, 8gig memory, fast SCSI drives, 8 core processors, i don't know the exact specifics, but they're not bad.

Here's a DBCC SHOWCONTIG on our table

DBCC SHOWCONTIG scanning 'message' table...
Table: 'message' (1448040590); index ID: 1, database ID: 13
TABLE level scan performed.
- Pages Scanned................................: 51602
- Extents Scanned..............................: 6486
- Extent Switches..............................: 6948
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 92.83% [6451:6949]
- Logical Scan Fragmentation ..................: 0.54%
- Extent Scan Fragmentation ...................: 0.93%
- Avg. Bytes Free per Page.....................: 93.5
- Avg. Page Density (full).....................: 98.85%
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

This is from our dev environment which is but a portion of our production db- but I presume our production environment will have similar percentages (not necessarily the pages scanned)

Any suggestions on how to delete records efficiently?

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Query Problem: Automatically Resetting A Sequential Number List After Row Deletion

Apr 7, 2004

Hello!
Got a problem I hope some clever people can help me out with..

I have a web form that displays a set of records in a grid. The grid is "paged" according to a PageNum column, with a dropdown box to change pages and buttons allowing the items to be moved up or down a list within a page or moved between pages. So the backend table (simplified) looks something like this

PageNum ItemNum ItemDescription
----------- ----------- -------------------
1 1 aaaaaaa
1 2 bbbbbbb
1 3 cccccccc
2 1 ddddddd
2 2 eeeeeee
2 3 ffffffffffff
3 1 ggggggg
3 2 hhhhhhh
3 3 iiiiiiiiiiiiiiii

The problem is when I want to delete a page - I need the page numbers to automatically resequence themselves, so for example, If I delete "Page 2" (i.e. delete rows where PageNum = 2), all items on "Page 3" become "Page 2" (and any items on "Page 4" become "Page 3" etc).

This has proved straightforward to when deleting an item from a particular page, and can resequence ItemNum thanks to a clever bit of code found on SQLteam.com:

DECLARE @intCounter int
SET @intCounter = 0
UPDATE <Item Table>
@intCounter = ItemNum = @intCounter + 1
WHERE Pagenumber = <Currently Selected Page>

However I haven't been able to adapt this to resequence the Page number, as this involves resequencing blocks of numbers. The closest I can get is:

DECLARE @intCounter int
SET @intCounter = 1
UPDATE <Itemtable>
SET @intCounter = PageNum = CASE
WHEN @intCounter = PageNum - 1 THEN @intCounter + 1
WHEN @intCounter = PageNum - 2 THEN @intCounter + 1
ELSE @intCounter
END

But this doesn't quite work.
Anyone got any other ideas??

Thanks
Greg

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Hi all,

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The size of table is 85 GB

Immediate help would be appriciable.

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table1 has a PK_tbl1 which matches FK_tbl1 in table2 and the relationship is one to one. Like this:

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So if I need remove an item from table1 I must remove the matched one in table2 first.

delete from table2 where UnitId = xxx
delete from table1 where UnitId = xxx

Now I need create a trigger on table1 for deletion:

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[code]....

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Apr 14, 2006

hi

Basically, I create a database with sql, then I delete it manually(not via sql statment. This is a problem which I realise. In fact, you can't delete the database because the VS 2005 still is using it) I run the same code again,
then it says the database still exists, even it is physically destroied.

------Here is the errors:
System.Data.SqlClient.SqlException: Database 'riskDatabase' already exists.
at System.Data.SqlClient.SqlConnection.OnError(SqlExc eption exception, Boolea
n breakConnection)

------The evidence that the database doesn't exist physically:
Unhandled Exception: System.Data.SqlClient.SqlException: Cannot open database "riskDatabase" requested by the login. The login failed.

------The code:
/*
* C# code to programmically create
* database and table. It also inserts
* data into the table.
*/

using System;
using System.Collections.Generic;
using System.Text;

using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.IO;

namespace riskWizard
{
public class RiskWizard
{
// Sql
private string connectionString;
private SqlConnection connection;
private SqlCommand command;

// Database
private string databaseName;
private string currDatabasePath;
private string database_mdf;
private string database_ldf;

public RiskWizard(string databaseName, string currDatabasePath, string database_mdf, string database_ldf)
{
this.databaseName = databaseName;
this.currDatabasePath = currDatabasePath;
this.database_mdf = database_mdf;
this.database_ldf = database_ldf;
}

private void executeSql(string sql)
{
// Create a connection
connection = new SqlConnection(connectionString);

// Open the connection.
if (connection.State == ConnectionState.Open)
connection.Close();

connection.ConnectionString = connectionString;
connection.Open();

command = new SqlCommand(sql, connection);
try
{
command.ExecuteNonQuery();
}
catch (SqlException e)
{
Console.WriteLine(e.ToString());
}
}

public void createDatabase()
{
string database_data = databaseName + "_data";
string database_log = databaseName + "_log";

connectionString
= "Data Source=.\SQLExpress;Initial Catalog=;Integrated Security=SSPI;";

string sql = "CREATE DATABASE " + databaseName + " ON PRIMARY"
+ "(name=" + database_data + ",filename=" + database_mdf + ",size=3,"
+ "maxsize=5,filegrowth=10%)log on"
+ "(name=" + database_log + ",filename=" + database_ldf + ",size=3,"
+ "maxsize=20,filegrowth=1)";

executeSql(sql);
}

public void dropDatabase()
{
connectionString
= "Data Source=.\SQLExpress;Initial Catalog=" + databaseName + ";Integrated Security=SSPI;";

string sql = "DROP DATABASE " + databaseName;

executeSql(sql);
}

// Create table.
public void createTable(string tableName)
{
connectionString
= "Data Source=.\SQLExpress;Initial Catalog=" + databaseName + ";Integrated Security=SSPI;";

string sql = "CREATE TABLE " + tableName +
"(userId INTEGER IDENTITY(1, 1) CONSTRAINT PK_userID PRIMARY KEY," +
"name CHAR(50) NOT NULL, address CHAR(255) NOT NULL, employmentTitle TEXT NOT NULL)";

executeSql(sql);
}

// Insert data
public void insertData(string tableName)
{
string sql;

connectionString
= "Data Source=.\SQLExpress;Initial Catalog=" + databaseName + ";Integrated Security=SSPI;";

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1001, 'Puneet Nehra', 'A 449 Sect 19, DELHI', 'project manager') ";
executeSql(sql);

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1002, 'Anoop Singh', 'Lodi Road, DELHI', 'software admin') ";
executeSql(sql);

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1003, 'Rakesh M', 'Nag Chowk, Jabalpur M.P.', 'tester') ";
executeSql(sql);

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1004, 'Madan Kesh', '4th Street, Lane 3, DELHI', 'quality insurance mamager') ";
executeSql(sql);
}

public static void Main(String[] argv)
{
string databaseName = "riskDatabase";
string currDatabasePath = "E:\liveProgrammes\cSharpWorkplace\riskWizard\A pp_Data";
// Need to be more flexible.
string database_mdf = "'E:\liveProgrammes\cSharpWorkplace\riskWizard\ App_Data\riskDatabase.mdf'";
string database_ldf = "'E:\liveProgrammes\cSharpWorkplace\riskWizard\ App_Data\riskDatabase.ldf'";

RiskWizard riskWizard = new RiskWizard(databaseName, currDatabasePath, database_mdf, database_ldf);
riskWizard.createDatabase();
riskWizard.createTable("userTable");
riskWizard.insertData("userTable");
//riskWizard.dropDatabase();
}
}
}

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For Deletion..trigger Is Not Working

May 4, 2004

Hi,
I have this trigger, it is working fine when i add new data but it doesn't work when I delete data from the table?

Any idea?

Any help will be highly appreciated.


CREATE TRIGGER [PROP_AMT] ON [dbo].[cqe_item]
FOR INSERT, UPDATE, DELETE
AS
DECLARE
@var_DB_contract INTEGER,
@var_CQE INTEGER,
@var_PC INTEGER,
@var_item VARCHAR(7),
@var_AMT_PAID INTEGER,
@var_AMT_RET INTEGER,
@var_ITEM_NEW VARCHAR(1),
@var_quant DECIMAL,
@var_fiyr INTEGER,
@var_amt_result INTEGER,
@var_amt_ret_result INTEGER,
@var_amt_old INTEGER,
@var_amt_ret_old INTEGER,
@var_quant_result INTEGER,
@var_quant_new INTEGER,
@var_quant_old INTEGER,
@Item_new VARCHAR(7),
@var_chk varchar(1)

--If Exists (Select 1 From Inserted) And Exists (Select 1 From Deleted)
set @var_db_contract =(SELECT a.db_contract FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
IF @var_db_contract IS NOT NULL
BEGIN
SET @var_db_contract=(SELECT a.db_contract FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_cqe=(SELECT a.cqe_numb FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_pc=(SELECT a.pc_code FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_item=(SELECT a.item_no FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_fiyr=(SELECT a.fy_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
set @var_chk ="Y"
END
ELSE
BEGIN
SET @var_db_contract=(SELECT a.db_contract FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_cqe=(SELECT a.cqe_numb FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_pc=(SELECT a.pc_code FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_item=(SELECT a.item_no FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_fiyr=(SELECT b.fy_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
set @var_chk="N"
END
SET @var_amt_paid=(SELECT a.amt_paid_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_amt_old=(SELECT b.amt_paid_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_amt_result =ISNULL(@var_amt_paid,0) - ISNULL(@var_amt_old,0)

SET @var_amt_ret = (SELECT a.amt_ret_item from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_amt_ret_old=(SELECT b.amt_ret_item from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_amt_ret_result = isnull(@var_amt_ret,0) - isnull(@var_amt_ret_old,0)

SET @var_quant_new = (SELECT a.quantity from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_quant_old =(SELECT b.quantity from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_quant_result = isnull(@var_quant_new,0) - isnull(@var_quant_old,0)
SELECT @item_new = new_item
FROM VALID_ITEM
WHERE DB_CONTRACT = @var_db_contract
AND PC_CODE = @var_PC
AND ITEM_NO = @var_ITEM

UPDATE ae_contract
set amt_paid_contr = isnull(amt_paid_contr,0) +@var_amt_result,
amt_ret_contr = isnull(amt_ret_contr,0) + @var_amt_ret_result
where db_contract = @var_db_contract

IF @item_new = 'N'
BEGIN
update vendor
set used_amt = isnull(used_amt,0) + @var_amt_result + @var_amt_ret_result
where db_vendor = (select gen_contr from ae_contract
where ae_contract.db_contract=@var_db_contract);
END
UPDATE enc_det
set amt_paid_fy = isnull(amt_paid_fy,0) + @var_amt_result,
amt_ret_fy = isnull(amt_ret_fy,0) + @var_amt_ret_result
where db_contract = @var_db_contract
and pc_code = @var_pc
and fy = @var_fiyr

UPDATE valid_item
set tamt_ret_item = isnull(tamt_ret_item,0) + @var_amt_ret_result,
tamt_paid_item = isnull(tamt_paid_item,0) + @var_amt_result,
qtd = isnull(qtd,0) + @var_quant_result
where db_contract = @var_db_contract
and pc_code = @var_pc
and item_no = @var_item

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 Hi I am not sure if I am at right place, anyhow I hope I am :) Now the question: I am using an ASP.net Application with SQL-Server. I want to make a page so that it set the expiration time (date)  for certain record and once that time reaches, it deletes those records, or make any updates to the record (what ever applicable). I also want to control this auto deletion from my application, means that turn this On/Off whenever needed. I am not sure how to start this. I was told by a friend that I need to use triggers from SQL-server but I need some help. Can anyone help me out on this? RegardsMykhan 

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Quote: Originally Posted by achoudry ps i am using sqlserver well, whaddya know, eh

do you realize you posted in the mysql forum?

i'm gonna move this thread to the sql server forum

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Hello,

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Anil Chauhan writes "Hello experts,

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Rahul Arora
07 Batch
NCCE Israna,


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IMPOSSIBLE = I+M+POSSIBLE

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