SQL 2012 :: Queue Table Strategies
Jul 10, 2015
I'm trying to flesh out a good queue table design with our dev team.So here is a general overview of the scenario. First an application will hit a WebAPI and grab any updates to Content and store those ID's in SQL (queue table). Next is the fun part, different multi threaded apps will process ID's from the queue. One app will make updates to the data in a different SQL DB while the other will update an index (likely Elastic).
Obviously, we don't want multiple threads working on the same items. One strategy could be to use UPDLOCK & READPAST query hints. However, I'm not sure about the reliability or performance of this solution. I just started looking into setting up a service broker but that would be completely unfamiliar territory for me. Also I can see how a broker might work well within the instance but how would that work with the application making updates to Elastic?
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Oct 28, 2014
I have the requirement to implement archiving of some database old data.
The database is not used to store files, just table with text/numeric data, some data modification logs.
Which strategies do you usually use to archive old records from a database?
Do you move old/unused data to another similar database in another server?
The data needs to be accessible for read access, even when archived.
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Sep 14, 2015
Our Sql server is not responding, So we restarted the server and modified one of the sp code. After that we are getting frequently every 2 min giving the below error
The queue 855365233 in database 9 has activation enabled and contains unlocked messages but no RECEIVE has been executed for 453199 seconds
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Jan 11, 2006
Hello,
This is info that I am still not certain about and I just need to make sure, my gut feeling is correct:
A.
When a procedure is triggered upon reception of a message in a queue, what happens when the procedure fails and rolls back?
1. Message is left on the Queue.
2. is the worker procedure triggered again for the same message by the queue?
3. I am hoping the Queue keeps on triggering workers until it is empty.
My scenario is that my queue reader procedure only reads one message at a time, thus I do not loop to receive many messages.
B.
For my scenario messages are independent and ordering does not matter.
Thus I want to ensure my Queue reader procedures execute simultaneously. Is reading the Top message in one reader somehow blocking the queue for any other reader procedures? I.e. if I have BEGIN TRANSACTION when reading messages of the Queue, is that effectively going prevent many reader procedures working simultaneously. Again, I want to ensure that Service broker is effectively spawning procedures that work simultaneously.
Thank you very much for the time,
Lubomir
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Nov 22, 2002
I have a table that I want to act as a queue.
It has no indexes and no key. Just one column.
Basically I want a stored procedure that will pull / return the first record off the queue (table) and delete it. I'd rather not use MSMQ for this.
There will be about 10 users trying to do this at the same time and will be trying to pull of about 15 times every second.
How can I do this and ensure that no two requests pull off the same row?
Thanks,
Kevin
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Jul 20, 2005
I am trying to implement a very fast queue using SQL Server.The queue table will contain tens of millions of records.The problem I have is the more records completed, the the slower itgets. I don't want to remove data from the queue because I use thesame table to store results. The queue handles concurrent requests.The status field will contain the following values:0 = Waiting1 = Started2 = FinishedAny help would be greatly appreciated.Here is a simplified script to demonstrate what has been done.CREATE TABLE [dbo].[Queue] ([ID] [int] IDENTITY (1, 1) NOT NULL ,[JobID] [int] NOT NULL ,[Status] [tinyint] NOT NULL) ON [PRIMARY]GOCREATE INDEX [Status] ON [dbo].[Queue]([Status]) ON [PRIMARY]GOCREATE PROCEDURE dbo.NextItem@JobID integer,@ID integer outputASSELECT TOP 1 @ID = [ID]FROM Queue WITH (READPAST, XLOCK)WHERE (Status = 0) AND (JobID = @JobID)RETURNGO
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Jul 26, 2006
I know we are not allowed to benchmark SQL Server but..... It would be nice to have material to present which demonstrates the performance gains using a queue compared to insert/delete in a SQL table.
Logically it seems faster to use a queue due to the conversation grouping locking and the service broker itself. But there seems to be some overhead involved just to manage these queues that the service broker has to perform.
I am sure we are not unique with the choice to figure out if we will get a boost in performance using SQL a queue between services rather than a table to queue data. What is available to help understand the performance gains of using a queue?
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May 16, 2006
Dear all,I'd like to explore more about indexing strategies and would appreciatea reference to some good resources this regard including book names.Best regards
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Sep 28, 2007
hello, what are the strategies when designing tables that needspaging?in the past i used to useselect top 200 * from tablewhere id not in (select top 100 id from table)with SQL 2005, would u guys recommend using CTE and/or ROW_NUMBER?or any other advice?thanks
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Aug 23, 2007
I have been somewhat dismayed by the lack of information available relative to testing SSIS solutions. At a time when both managed code and db code are getting tooling (through VSTS) to help drive an automated testing mentality into developers everywhere - there seems to be little out there for those using SSIS. I have seen people talk about having SSIS packages that test the actual packages - there is always the manual way to write the tests in something like C# and then programmatically invoke the package and manually validate the results. Anyone out there have approaches that are working for them?
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Oct 2, 2007
Im about to start a project that will be hosted by a third party web host. What is a common way to backup your database and have the backup saved ? The data may end up being several 100 MB of user settings, text etc (blog type stuff). If the DB gets to be several 100MB, then does making a backup and ftping it offsite sound reasonable ? Does ftp bandwidth usually count against your overall bandwidth usage ?
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Jul 20, 2005
I am looking for some published paper regarding database performancetunning performance strategies. This is for academic purpose so itneeds not to be any commerical database specific. It will be evenbetter if the paper has some kind of methods to quantify/measureperformance. Has anyone come across with any interesting paper aboutthis?Thanks,ewong
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Apr 7, 2004
Hi all
We are writing a web-based multi-user call centre application application.
we are getting concurrency problems as you would expect with a multiuser application.
the application is made for callers who will bring up a different contact to call based on some predefined priority. now because the algorithm that prioritises the contacts takes a good 2 seconds to run, if 2 different caller request for the next prioritised contact, they will retrieve the same contact.
The only way that we think can resolve this problem is by building a queue. The queue would be implemented as a table, the particular implementation of this queue would be, when ever someone retrieves an entry from the queue, a background process will go on and generate a new queued item, i.e. in a FIFO manner. So that's how we think we should implement the queue.
Now come the question how to implement it. My idea is to have row level locking and a trigger to remove queue items from the queue. so that once one caller have looked at one of the item in the queue, another user can't look at the same item.
Any suggestions as to how i might be able to avoid concurrency problems?
What do you all think of my idea of implementing the FIFO queue?/
Is it possible to do row level locking in such a way that other users won't even be able to read the locked entry??
James :)
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Jun 18, 2015
Trying to create a report... Report should show * documents on hold then depending on the "on-hold type" look in the corresponding table and SELECT a few fields. Here is what I have. Where do I SET the @profile variable to return the profile from my queue table?
DECLARe
@profilevarchar(256)
SELECT
q.[profile],q.on_hold,q.on_hold_message,q.dbc_state
FROM
QueueASq
[code]...
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Feb 14, 2007
hey all you database guru's hopefully someone can lend some insight as to a little table design problem I have.
Basically I've got a system in place to authorize users to access a website typical username password stuff. The table contains a list of users and there passwords plus the auth level and a few other tid bits that aren't really important enough to into detail about them here. What I want to do is add a messaging system to this, I think I could probably figure out a way to do this half decent if I setup a seperate table for each user to add a row to the table for every message entry than in my asp.net code have it delete everything but the last 10 entries every time a user logs on. However I would much prefer a way that I didn't have to setup a whole new table for each user just for messaging purposes, maybe store something like a list in one of the database cell's kind of like .nets generic.list or better yet generic.queue, I would also like a way if it's possible without too much work to have the table automatically delete the oldest message every time a new message is received if there's already 10 messages existing for the user.
Anyways hopefully someone has some experience in setting up a system like this, I don't really require any code samples I can code it all myself (other than the database code to automatically remove entry's, I'm not a database guy) if someone could just explain a way to accomplish what I'm trying to do, or if someone has a different more convenient way of doing this I would be up for suggestions
Thanks in advance for any help offered, I do appreciate it
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Apr 26, 2007
In a situation where messages are coming in faster than they can be processed, at what point will service broker start up another queue_reader? Also, how do you prevent table locking if part of the processing of that message involves inserting or updating data in a table? We are experiencing this problem because of the high number of messages coming through, and I'm not sure what the best solution is - does service broker have some built-in support for preventing contention on a table when multiple readers are running? Or maybe a pattern that can be used to get around it?
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Mar 29, 2007
There is a great book on database refactoring that contains a comprehensive set or recipies on how to revise databases that are supposed to be always online and may have various clients that can't be upgraded at the same time. I guess this is a typical case with large databases and I would be surpised if Amazon stops their servers just to move a column from one table to another. The book describes necessary steps for such changes. Basically it's all about creating intermediate database schemas that would be used during transition period.
For example, if we need to move a column from one table to another:
Version 1.
Table A columns: Name, Price
Table B columns: Quantity, Date
Let's say we move Price to table B:
Version 2.
Table A columns: Name
Table B columns: Quantity, Date, Price
The book suggests an intermediate version:
Version 1_2.
Table A columns: Name, Price
Table B columns: Quantity, Date, Price
Additional trigger that will synchronize "Price" columns between A and B.
Version 1_2 can be used by both clients written for version 1 and 2. Software developers don't need to rush their upgrades, transition can last months and include several changes.
This technique requires accuracy in version control management, but looks very good to implement non-interruptible database schema upgrade. I wonder if this is the only option available for data schema upgrade with no downtime. I can't think about anything else - it this how large data warehouses updata their databases?
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Aug 12, 2014
I want Compare two Table data and insert changed field to the third table ...
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Feb 11, 2015
i am inserting something into the temp table even without creating it before. But this does not give any compilation error. Only when I want to execute the stored procedure I get the error message that there is an invalid temp table. Should this not result in a compilation error rather during the execution time.?
--create the procedure and insert into the temp table without creating it.
--no compilation error.
CREATE PROC testTemp
AS
BEGIN
INSERT INTO #tmp(dt)
SELECT GETDATE()
END
only on calling the proc does this give an execution error
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Jan 14, 2014
What is the best way to transfer data from the staging table into the main table.
Example:
Staging Table Name: TableA_satge (# of rows - millions)
Main Table Name: TableA_main (# of rows - billions)
Note: Staging table may have some data same as the main table.
Currently I am doing:
- Load data into staging table (TableA_stage)
- Remove any duplication of rows from the staging table (TableA_stage)
- Disable all indexes on main table (TableA_main)
- Insert into main table (TableA_main) from staging table (TableA_stage)
- Remove any duplication of rows from the main table using CTE (TableA_main)
- Rebuild indexes on main_table (TableA_main)
The problem with the above method is that, it takes a lot of time and log file size grows very big.
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Apr 29, 2014
I have table 'stores' that has 3 columns (storeid, article, doc), I have a second table 'allstores' that has 3 columns(storeid(always 'ALL'), article, doc). The stores table's storeid column will have a stores id, then will have multiple articles, and docs. The 'allstores' table will have 'all' in the store for every article and doc combination. This table is like the master lookup table for all possible article and doc combinations. The 'stores' table will have the actual article and doc per storeid.
What I am wanting to pull is all article, doc combinations that exist in the 'allstores' table, but do not exist in the 'stores' table, per storeid. So if the article/doc combination exists in the 'allstores' table and in the 'stores' table for storeid of 50 does not use that combination, but store 51 does, I want the output of storeid 50, and what combination does not exist for that storeid. I will try this example:
'allstores' 'Stores'
storeid doc article storeid doc article
ALL 0010 001 101 0010 001
ALL 0010 002 101 0010 002
ALL 0011 001 102 0011 002
ALL 0011 002
So I want the query to pull the one from 'allstores' that does not exist in 'stores' which in this case would the 3rd record "ALL 0011 001".
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Nov 19, 2014
I'm using SS 2012.
I started with an inline table returning function with a hard coded input table name. This works fine, but my boss wants me to generalize the function, to give it in input table parameter. That's where I'm running into problems.
In one forum, someone suggested that an input parameter for a table is possible in 2012, and the example I saw used "sysname" as the parameter type. It didn't like that. I tried "table" for the parameter type. It didn't like that.
The other suggestion was to use dynamic sql, which I assume means I can no longer use an inline function.
This means switching to the multi-line function, which I will if I have to, but those are more tedious.
Any syntax for using the inline function to accomplish this, or am I stuck with multi-line?
A simple example of what I'm trying to do is below:
Create FUNCTION [CSH388102].[fnTest]
(
-- Add the parameters for the function here
@Source_Tbl sysname
)
RETURNS TABLE
AS
RETURN
(
select @Source_Tbl.yr from @Source_Tbl
)
Error I get is:
Msg 1087, Level 16, State 1, Procedure fnTest, Line 12
Must declare the table variable "@Source_Tbl".
If I use "table" as the parameter type, it gives me:
Msg 156, Level 15, State 1, Procedure fnTest, Line 4
Incorrect syntax near the keyword 'table'.
Msg 137, Level 15, State 2, Procedure fnTest, Line 12
Must declare the scalar variable "@Source_Tbl".
The input table can have several thousand rows.
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Dec 23, 2013
I just created a new table with over 100 Columns and I need to populated just the first 2 columns.
The first columns to populate is an identify column that is the primary key. The second column is a foreign_key to an other column and I am trying to populate this columns with all the values from the foreign_key value. This is what I am trying to do.
column1 = ID
column2= P_CLIENT_D
SET IDENTITY_INSERT PIM1 ON
INSERT INTO PIM1 (P_CLIENT_ID)
SELECT
Client.ID
FROMP_Client
So I am trying to insert both an identity values and a value from an other table while leaving the other columns blank. How do I go about doing this.
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Mar 7, 2014
Why the Indexes on table slow down the DML operation on table, what is the exact reason?
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Oct 6, 2014
I am trying to use a stored procedure to update a column in a sql table using the value from a variable table I getting errors because my syntax is not correct. I think table aliases are not allowed in UPDATE statements.
This is my statement:
UPDATE [dbo].[sessions_teams] stc
SET stc.[Talks] = fmt.found_talks_type
FROM @Find_Missing_Talks fmt
WHERE stc.sessionid IN (SELECT sessionid FROM @Find_Missing_Talks)
AND stc.coupleid IN (SELECT coupleid FROM @Find_Missing_Talks)
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Sep 14, 2015
I have a function that returns a table from a comma-delimited string.
I want to take this a step further and create a function that will return a set of tablenames in a table based on a 'group' parameter which is a simple integer...1->9, etc.Obviously, what I am doing is not working out.
CREATE FUNCTION dbo.fnReturnTablesForGroup
(
@whichgroup int
)
RETURNS @RETTAB TABLE (
TABLENAME VARCHAR(50)
[code]....
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Aug 25, 2014
I am using the DTS wizard and having problems importing excel into an existing table.
Problem is that various column in excel are defined as double in the wizard but in my db table it is defined as an integer.
How do I get around this issue so the data types in excel can match up accordingly to my defined data type in my db table?
The wizard does a bad job of guessing the correct data type.
I have heard of using a staging table to import from excel and using that as my source to import into my existing table.
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Sep 18, 2014
I have a 2010 SSIS package where I am reading csv files with different fields and formatted data, I have created separate packages for each file and I am formatting the data to fit the final destination tables data elements, I've been instructed to create 7 separate packages to read each file and the format the data from the 7 csv files, and insert into their table tbl1, tbl2, tbl3...etc then, I'm taking a execute sql task and wanting to insert the tbl1, tbl2, tbl3...etc into destination table that will be the final table for all reports and other uses.
1- should I create a ID?
2- these files will be read once a month
3- I want to append the data, not drop and recreate each run,
4- It's 2012 SQL and 2010 SSIS
Each csv file is in a different format, some have 15 columns, other have 8 I have to parse the data, in SP to align with the fields in the destination table.
5- Can I force RowID to be the next auto gen number from tbl1,for the start of insert for tbl2, then last row of tbl2 for insert of tbl3???
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Dec 25, 2014
I need to capture changes in my table and store it in another table. Here is how my table would look like.
CREATE TABLE [dbo].[ABC](
[Hno] [nchar](10) NULL,
[Status] [smallint] NULL,
[Date] [datetime] NULL
) ON [PRIMARY]
[Code] ....
In return I need to check column Status for whenever the value has changed and need to store that in my table. If there are two records for which value in column Status is same, I need to pick only one of the records and that being the earliest of them and therefore the Date field is mentioned in my table . My output should be something like below.
100 02014-12-20 00:55:44.667
100 12014-12-22 00:55:44.723
100 02014-12-24 00:55:44.723
100 12014-12-26 00:55:44.723
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Feb 19, 2015
I need to create a table from these 2 tables and want all the data. Table 1 has 15000 records and table has around 1000 records.
I have 2 tables.
SELECT [UniqueID]
,[Company]
,[CustID]
,[CustomerName]
,[FiscYr]
[Code] ....
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Mar 6, 2015
I am using SQL SERVER 2012..I have the following table:
tbtab1
| A | B | C |
| 1 | Pluto | NULL |
| 2 | Pippo | NULL |
| 3 | Rossi | NULL |
I want to creare a new empy table with the columns name contained into the column B of the first table; the following should my results:
tbtab2
| Pluto | Pippo | Rossi |
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May 28, 2015
I have this table:
with actividades_secundarias as (
select a.*, r.Antigo, r.Novo, rn = row_number()
over (PARTITION BY a.nif_antigo, r.novo ORDER BY a.nif_antigo)
from ACT_SECUNDARIAS a inner join
((select
[Code] ....
I want to make a delete statement like this:
select * into #table1 from actvidades_secundarias where rn>1
Delete from act_secundarias where act_secundarias.nif_antigo = #table1.nif_antigo and act_secundarias.cod_cae = #table1.cod_cae
But it seems that I cant delete like this.
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Jul 29, 2015
To avoid locking/blocking, or in transaction scope, we are trying make a common practice of writing coide for update commands in our all SPs based on primary key columns in where clause. I have a following scenario...
UPDATE [dbo].[TL_CST_Locker_Issuance] SET
[isActive] = 0
WHERE
LockerIssuanceId IN (SELECT LockerIssuanceId
[Code] ...
What is the better approach and should be followed to avoid locks and gain performance or best approach.
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