Predicate Locking
Jul 23, 2005
Hi
I am having a debate with one of the Postgres developers (Tom Lane)
according to him ms-sql does not implement predicate
locking(SERIALIZABLE).
Where predicate locking is defined as (from the postgres help):
"12.2.2.1. Serializable Isolation versus True Serializability"
It states: "To guarantee true mathematical serializability, it is
necessary for a database system to enforce predicate locking, which
means that a transaction cannot insert or modify a row that would have
matched the WHERE condition of a query in another concurrent
transaction"
Now I put it to him that that is exactly what SERIALIZABLE does is
MS-SQL.
But his response was "Only for WHERE conditions that can be expressed
as a simple range constraint."
Now is he correct i.e SERIALIZABLE works "Only for WHERE conditions
that can be expressed as a simple range constraint." ?
Regards,
Daniel Roth
MCSD.NET
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Nov 20, 2006
hi ,
what is the definition and difference between predicate and residual predicate.
give me some examples..Basically the columns used in where clause are called as predicates. Am i right.
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Jan 20, 2008
I run statement down,result is "go". why goes,gone,going is not in the result?
SELECT ID, firstname, lastnameFROM [contain-1]WHERE CONTAINS(firstname, ' FORMSOF (INFLECTIONAL, go) ')
information table [contain-1]
ID firstname
1 go
2 goes
3 gone
4 going
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Jan 20, 2008
what result this query?
SELECT productname
FROM product
WHERE CONTAINS(productname,'spread NEAR boysenberry' )
explain word "NEAR".
Thanks,mohsen
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Jan 26, 2008
I run query down.result is null.
SELECT ID, firstname, lastname
FROM [contain-1]
WHERE CONTAINS(firstname, 'pooya NEAR yaser')
table [contains-1] information:
ID firstname
1 pooya
2 mehdi
3 peter
4 yaser
why result is null?
thanks,mohsen
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Jan 30, 2008
I run query down.result is null.
SELECT ID, firstname, lastname
FROM [contain-1]
WHERE CONTAINS(firstname, 'pooya NEAR yaser')
table [contains-1] information:
ID firstname
1 pooya
2 mehdi
3 peter
4 yaser
5 pooyaandyaser
why result is null?
thanks,mohsen
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Feb 1, 2008
I run query down.result is null.
Why is result null?
SELECT ID, firstnameFROM [contain-1]WHERE CONTAINS(firstname, 'yaser NEAR pooya')
table information:
ID firstname
1 ali
2 peter
3 yaser
4 yaserapooya
5 mehdi
Thanks,mohsen
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Jul 20, 2005
Hi,i want to search record in a table where a varchar column is equal toa word or this word with the letter 's' or this word with the letter'e'.Today, i've this query :select * From Table Where Column = 'Word' or Column like 'Word[es]'I want to remove the 'or' of this query to have only one condition.Does someone know a solution to my problem.Excuse my poor english language.I hope you understand my problem and thks for solution.
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Jun 27, 2006
Hi everybody,
I have a problem using the CONTAINS predicate. I use the contains
predicate in a web page that students utilize to look for dissertations
stored in a database (MS 2000) of the library. The search is one
big textbox where students can perform any type of reaserch. For
instance, they can insert the author, the title or few keywords of a
dissertation. After they have clicked on the button Submit, the words
that they have inserted are filtered and combined (with AND) in
one string:
Example: miami, education --> 'Miami AND Education'
An example of the query that I need to perfrom is the Query Number 1:
select docnumber,Title
FROM [Log].[dbo].[DocTable1]
where contains(SearchColumn,'miami AND education') order by docnumber
SearchColumn is a field (varchar) that is the concatenation of various
fields such as Location, Title, Author, etc... that are contained in
the same table (See below for the description of the Table DocTable1).
I'm currently testing the search and I have figured out that the query described above does not work.
For example, the query should produce the same resultsof the following one, but it does not:
select docnumber
FROM [Log].[dbo].[DocTable1]
where contains(Location,'miami') AND
contains(Keywords,'education') order by docnumber
I need to implement the first query, but i can not understand why it
does not produce the same results of the second one. Any Ideas?
Thanks,
Christian
--------------------------------------------------------------
CREATE TABLE [DocTable1] (
[DocNumber] [int] NOT NULL ,
[LastName] [varchar] (30) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[FirstName] [varchar] (30) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Program] [varchar] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Paper] [varchar] (30) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Location] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[ANNO] [int] NULL ,
[Title] [varchar] (350) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[TitleSort] [varchar] (350) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Keywords] [varchar] (350) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[FT] [char] (1) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[URL] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[SearchColumn] [varchar] (900) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
CONSTRAINT [PK_DocTable1] PRIMARY KEY CLUSTERED
(
[DocNumber]
) ON [PRIMARY] ,
CONSTRAINT [Title_Author_DocTable1] UNIQUE NONCLUSTERED
(
[Title],
[LastName],
[FirstName]
) ON [PRIMARY] ,
CONSTRAINT [FT-Constraint] CHECK NOT FOR REPLICATION ([FT] = 'Y' or [FT] = 'N')
) ON [PRIMARY]
GO
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Jan 4, 2007
I am having problems with the following SQL statement. It works how I want it to work if I use = @SearchQuery but when I try to switch to LIKE I run into problems. I tried it the way it is shown below and I also tried LIKE '%'@SearchQuery'%' with no luck. Does this have something to do with the pattern to match being a parameter? How would I go about doing this correctly.
"SELECT server_info.*, network_adapter.* FROM server_info LEFT JOIN network_adapter " + "ON server_info.server_id = network_adapter.server_id WHERE " + DropDownList1.SelectedValue.ToString() + " LIKE '%@SearchQuery%'"
Thanks
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Oct 3, 2007
Anybody know how to do this?
"Select something from some table where id in (@IDlist)"
where @IDlist is a comma-separated list of values (or something top that effect)
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Apr 21, 2008
am encountering the NO JOIN PREDICATE warning in a query plan for a particualr SQL statement. In poking around, I've come across psotings that mention the CU 4 for SQL Server 2005. The update applies to a KB article that addresses complex queries with an outer join.
But in my case, it's not an outer join causeing the problem - they are all left joins. Here is the piece of SQL that is running extremely slowly:
Code Snippet
UPDATE @TESTTABLE
SET [@TESTTABLE].SignInCancelledNoEMR =
(SELECT q.cnt FROM
(SELECT COUNT(*) AS cnt,cl.Clinic_id AS ClinicIDq,cl.CLINIC_REG_ID AS MarketIDq
FROM dbo.tblactivity AS t
LEFT JOIN [ERIIProduction].dbo.computer c on t.machineid = c.comp_windowsname
LEFT JOIN [ERIIProduction].dbo.clinic cl on cl.clinic_id = c.comp_clinic_id
LEFT JOIN [ERIIProduction].dbo.Region r ON cl.CLINIC_REG_ID = r.REG_ID
WHERE t.status = '1'
AND cast(checkindate as datetime) >= @startDate
AND cast(checkindate as datetime) < DATEADD(d, 1, @endDate)
AND cl.clinic_reg_id IN (SELECT Item FROM dbo.Split(@regionIDList,','))
AND NOT EXISTS (SELECT 1 FROM [ERIIProduction].dbo.VisitPatient vp WHERE (t.activityid = vp.VSPAT_GalvanonActivityID)) --AND (t.memberid = vp.VSPAT_GalvanonMemberID))
GROUP BY cl.Clinic_id,cl.CLINIC_REG_ID) AS q
WHERE q.ClinicIDq = ClinicID AND q.MarketIDq = MarketID)
Before I apply the CU and enable the trace flags, I'd like to know if there is something else I can do within the query itself to make it run faster. I've tried the OPTION(FORCE ORDER ) hint, but that doesn't have any effect on the queery run time.
And as a whole, the query cost relative to the entire batch jumped from 75% to 96%.
Granted the execution time of the entire batch dropped from 9 minutes to 1 minute, this query should not even take that long.
Thanks for any input...!
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Aug 16, 2007
Hi guys,
I need to change some characters when reading the values of a certain columns, I am trying to use something like the code below, but the following error:
"Cannot use a CONTAINS or FREETEXT predicate on table 'JURNALTRANS' because it is not full-text indexed."
Code Snippet
CASE
WHEN Contains (JurnalTrans.DESCRIPTION, 'A') THEN Replace(JurnalTrans.DESCRIPTION,'A','A1')
WHEN Contains (JurnalTrans.DESCRIPTION, 'B') THEN Replace(JurnalTrans.DESCRIPTION,'B','B2')
ELSE JurnalTrans.DESCRIPTION
END AS 'Cost Description',
I am also trying something like this
Code SnippetSELECT DESCRIPTION AS 'X' FROM JURNALTRANS WHERE CONTAINS(DESCRIPTION, 'Y')
but getting the same error
"Cannot use a CONTAINS or FREETEXT predicate on table 'JURNALTRANS' because it is not full-text indexed."
Any help will be appreciated,
Thanks in advance,
Aldo.
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Apr 14, 2004
I have a report in SQL that passes parameters at runtime entered by the user for two date ranges (beginning and ending). I'm trying to write a formula that will print a specific field *only if* the specified date range entered by the user is BETWEEN a specific value (like 200401). This is kind of reverse of a normal WHERE, BETWEEN clause.
I tried a standard BETWEEN predicate in my WHERE clause like:
IF '200401' BETWEEN ?BegPer and ?EndPer then salesanal.ptdbud01 else 0
But, it's returning an error that my Then statement is missing. I can't use a normal statement like 'IF ?BegPer >= '200401' and ?EndPer <= '200401', then.....' because users could enter a RANGE of periods, so it would be difficult to code all of the possible combinations this way. I'm actually doing this in Crystal, but if someone can give me a standard MSSQL example, I can translate that over to Crystal.
Thanks in advance,
Michelle
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Oct 8, 2015
I have two tables. Table A has 2162 rows and table B has 101 rows. There isn't any join keys that I can join on these two tables. But I need everything from table B and only one column (Col1) from table A. It will result in a cross join and retruns 218362 (2162 * 101) rows, which is correct. But this takes about 30 seconds to complete. Any workaround to accomplish this? Optimizer shows no predicate joins on the Nested Loop and to me it is correct.
Here is what I have so far.
SELECT B.*, A.col1
FROM TableB B
LEFT JOIN TABLE A A
ON 1 = 1
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Jul 20, 2005
I have been searching for an escape character or a way of escapingdouble quotes that are actually in a string that I am using in thecontains predicate.Here is an exampleselect *from tablewhere contains(field, '"he said "what is wrong", that is what hesaid"')I need the double quotes in the string because they are part of thetext. Of course, Fulltext search raises the errorServer: Msg 7631, Level 15, State 1, Line 1Syntax error occurred near 'what is wrong", that is what he said'.Expected ''''' in search condition '"he said "what is wrong", that iswhat he said"'.If I remove the double quotes, the search does not return the properresults.Thanks in advance for the helpBill
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Oct 22, 2007
Hi,
I am using Microsoft FullText search feature in my database for Searching
strings.
I want to use CASE statement in CONTAINS.
DECLARE @allowSearchALL int
SELECT [ID] ,[Source] ,[Description],name
FROM [Search]
WHERE CONTAINS( Source , '"mail"')
i know we can use CASE in WHERE clause...but dono how to use CONTAINS with
CASE.
My Requirement is
if @allowSearchALL is 1 then get all records otherwise use specified
hardcoded text "mail"
I have to use CONTAINS.
I would like use some thing like this,
SELECT [ID] ,[Source] ,[Description],name
FROM [Search]
WHERE Source = CASE WHEN @allowSearchALL = 1 THEN Source ELSE 'mail' END
This way i can map column name to same column name if @allowSearchALL = 1 .
I do not want to use multiple IF blocks like if ( )
begin
end
else if( )
begin
end
How this can be done in CONTAINS ? like WHERE CONTAINS(source, CASE ....ELSE
...END)
Please give me solution for this.
Thanks in advance
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Jul 12, 2006
Hi,
What is the dowside of not using all uppercase for predicates and key words?
I cannot find to see a problem beside adhering to a clean coding convention. After all I already have color coding so what would be the uppercase for?
Same question for the semicolon ; at the end of a sql block. Is that real necessary not to get in trouble sometime down the road or is it a non-issue. I find like I am now a C# guys if I use these ;
Just curious, I find tedious to switch from all upper case to normal case all the time. And not forget to type the ;
Thanks,
Philippe
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Apr 5, 2007
Thanks in advance....
Let me simplify what I'm trying to do....
Basically, I want to run the following query by using SqlDataSource.
SELECT data FROM table WHERE row in ('one', 'two', 'three')
Simple enough....
So, here's my code.....which obviously doesn't work properly.
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnStr %>" SelectCommand="SELECT data FROM table WHERE row in (@username)">
<SelectParameters><asp:ControlParameter ControlID="TextBox1" Name="username" PropertyName="Text" Type="String" /></SelectParameters>
</asp:SqlDataSource>
<asp:Label ID="TextBox1" runat="server" Text="'one', 'two', 'three'" Width="125px" Visible="True"></asp:Label>
Is my SelectCommand correct? Thanks.
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Oct 25, 2004
Hi, our application is failing sometimes, with some select queries. After making traces in the database, I found the following error: Missing join predicate.
I googled that, and I only found this useless tip:
Missing Join Predicate: Indicates whether or not the query in question has a join predicate. If not, this can cause the Query Optimizer to produce a less than optimized query plan. The fix to this is to add a join predicate.
So, I dont know what a join predicate is... maybe I used it, but I don't know it by that name.
Thanks!
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May 9, 2006
Hey all,
I've a querie which inserts into a table, while joining on it. Something like:
insert into table1
(columnA,
columnB
)
select (columnA,columnB)
from table2
where columnA NOT EXIST(SELECT 1 from table1,table2 where table1.columnA!=table2.columnA)
As a rule of thumb, I avoid subselects and negative logic. However, sql2k seems to pick the fastest execution plan using this query, using a left anti semi join on that subselect. My question is this; what are the repercussions of inserting into a table when sql2k has already picked a query plan based on its stats? Is deadlocking possible? I haven't been able to find any evidence one way or the other. My objects are several million rows, so I am expecting some sort of side effect.
Any help would be greatly appreciated.
Regards,
-Kilka
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Feb 7, 2008
Hi all.
I am a new SQL Profiler user trying to baseline our eCommerce site. I am receiving EventClass 80, Missing Join Predicate (hereinafter MJP), often enough to be concerned about what may happen during very high traffic. I have isolated the query, included at the bottom of this post (cleaned up). There is very little info on this event class out on the web. Version is SQL 2000, latest service pack. I know I don't have table DDL here; I'm just trying to get overall direction without causing you much work/time.
Issues:
1. Even though only the value of product_id in the HAVING clause changes, I do not always get the MJP. I would expect that a query without a JP is a query without a JP and it would be all-or-none.
2. Although it happens maybe 20-30 % of the time in production, I can’t make it happen in testing.
Questions:
Anyone have experience with MJPs? How about the issue of why it's sporadic? Can anyone shed light? Know of good links, etc?
Thanks!!
bbRichbb
SELECT
p.Product_Id,
MIN(ae.Enum_Value) AS color,
p.Product_Name,
p.Status_Code,
ps.Curr_Price,
s.Section_Id,
COUNT(ps.SWATCH_STATUS) AS total_available_colors
FROM
Attribute_Enum_Value ae
INNER JOIN Product_Attribute_Enum pae ON ae.Attribute_Value_Id = pae.Attribute_Value_Id
AND ae.Attribute_Type_Id = pae.Attribute_Type_Id
INNER JOIN Product p
INNER JOIN Section_Product sp ON p.Product_Id = sp.Product_Id
INNER JOIN Section s ON sp.Section_Id = s.Section_Id ON pae.Product_Id = p.Product_Id
INNER JOIN PRODUCT_SWATCH ps ON ae.Enum_Value = ps.Color_Attr
AND p.Product_Id = ps.PRODUCT_ID
WHERE
(pae.Attribute_Type_Id = 500001)
AND (p.Product_Class_Id = 2)
AND (p.Status_Code = 'ACTV')
AND (ps.SWATCH_STATUS = 'ACTV')
GROUP BY
p.Sequence_Number,
p.Product_Id,
p.Product_Name,
p.Status_Code,
ps.Curr_Price,
s.Section_Id
HAVING
(p.Product_Id = 1209645)
ORDER BY
p.Sequence_Number,
p.Product_Id
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May 2, 2009
I believe query optimizer can leverage the predicate used to define the filtered index. But I came to a situation that's not true:
USE tempdb;
GO
IF OBJECT_ID('Employees') IS NOT NULL
DROP TABLE Employees;
GO
CREATE TABLE Employees
[Code] ....
If we take a look at the query plan. we'll find an unnecessary Nested Loop and Key Lookup operator there with the IS NULL predicate.
Ironically, If I change the IS NULL to IS NOT NULL in both the index and Query, everything goes fine.
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May 8, 2015
I have to write one query to exclude data from partial string in the predicate.
Select * from table where col NOT in ('%abc%,%xyz%).
So the data where col value doesn't contain the ABC and xyz string value only should be selected. I am also getting xyz data in the result.
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Apr 7, 2008
Good afternoon,
I'm trying to use a parameterin a way that RS seems to think is unnatural, and I'm wondering about a work around...
Normally I can use parameters like so:
select *
from foo
where fooValue > @myParameter
What I'd like to do instead is use a constant on the right of the predicate, and a parameter to define the column to measure against, like so:
select *
from foo
where @myParameter > 10
Or
select *
from foo
where @myParameter is not null
Any assist with this is greatly appreciated...
Thanks,
Brian
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Feb 7, 2008
Hi all.
I am a new SQL Profiler user trying to baseline our eCommerce site. I am receiving EventClass
80, Missing Join Predicate (hereinafter MJP), often enough to be concerned about what may happen
during very high traffic. I have isolated the query, included at the bottom of this post
(cleaned up). There is very little info on this event class out on the web. Version is SQL
2000, latest service pack. I know I don't have table DDL here; I'm just trying to get overall
direction without causing you much work/time.
Issues:
1. Even though only the value of product_id in the HAVING clause changes, I do not always get
the MJP. I would expect that a query without a JP is a query without a JP and it would be
all-or-none.
2. Although it happens maybe 20-30 % of the time in production, I can€™t make it happen in
testing.
Questions:
Anyone have experience with MJPs? How about the issue of why it's sporadic? Can anyone shed
light? Know of good links, etc?
Thanks!!
bbRichbb
SELECT
p.Product_Id,
MIN(ae.Enum_Value) AS color,
p.Product_Name,
p.Status_Code,
ps.Curr_Price,
s.Section_Id,
COUNT(ps.SWATCH_STATUS) AS total_available_colors
FROM
Attribute_Enum_Value ae
INNER JOIN Product_Attribute_Enum pae ON ae.Attribute_Value_Id = pae.Attribute_Value_Id
AND ae.Attribute_Type_Id = pae.Attribute_Type_Id
INNER JOIN Product p
INNER JOIN Section_Product sp ON p.Product_Id = sp.Product_Id
INNER JOIN Section s ON sp.Section_Id = s.Section_Id ON pae.Product_Id = p.Product_Id
INNER JOIN PRODUCT_SWATCH ps ON ae.Enum_Value = ps.Color_Attr
AND p.Product_Id = ps.PRODUCT_ID
WHERE
(pae.Attribute_Type_Id = 500001)
AND (p.Product_Class_Id = 2)
AND (p.Status_Code = 'ACTV')
AND (ps.SWATCH_STATUS = 'ACTV')
GROUP BY
p.Sequence_Number,
p.Product_Id,
p.Product_Name,
p.Status_Code,
ps.Curr_Price,
s.Section_Id
HAVING
(p.Product_Id = 1209645)
ORDER BY
p.Sequence_Number,
p.Product_Id
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Oct 1, 2014
I am looking to filter the query using the free text predicate Contains for one of the column that have dimensions of the items. The query is something like
Select * from sampletable
where contains(filtercolumn, 'Near("*cm , *cm , *cm , *Kg.",10,True)')
Data in the filtercolumn is something like 64cm x 25cm x 35cm = 10Kg.
The query do not return any data.I also tried running the below query to see if cm* can be searcher for, but with no result again
Select * from sampletable
where contains(filtercolumn,, '"cm*"')
If I do something like below, it does return all columns that have 35cm within the text.
Select * from sampletable
where contains(filtercolumn,, '"35cm"')
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Jan 27, 2015
After monitoring using SQL profiler, i found that Missing join predicate event is happening a lot.
The problem is that profiler doesn't allow me to select the textdata to know which SQL statement is causing the issue.
I tried using the spid to check what's that process is running but the problem is that application is running many sqls so when i run
select PROGRAM_NAME,hostname,qt.text from sys.sysprocesses as sps1 CROSS APPLY sys.dm_exec_sql_text(sps1.sql_handle) AS qt
where spid=169
it gets me the SQL being run at that time not the one that causing the event.
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Nov 14, 2007
Hi, I test the following sql statement, finding that an error ocurs:
Msg 7630, Level 15, State 2, Line 3
Syntax error near '"' in the full-text search condition '"dsg SDRGDG " OR "sdfsdfsdfsdafdsafdsfds'.
DECLARE @searchTerm NVARCHAR(40)
SET @searchTerm = '"dsg SDRGDG " OR "sdfsdfsdfsdafdsafdsfdsafdsafdsafsafdfdsafdf"';
SELECT [JobTitle], [JobDes], [OpenDate], j.[URLRef], c.[CompanyName], c.[URLRef], c.[URLSource]
FROM JobWanted AS j INNER JOIN
Company AS c ON c.CompanyID = j.CompanyID
WHERE CONTAINS((JobTitle, JobDes), @searchTerm)
It seems too lengthy string will cause an error for full-text engine. I find the sdfsdfsdfsdafdsafdsfdsafdsafdsafsafdfdsafdf is truncated as shown in error message.
How to avoid this issue? Could I configre this limination?
Thanks in advance.
Ricky.
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May 28, 2008
Hi everyone,
I have a question about SQL Server 2005. I have written an ASP.Net 2.0 Web Application and it is using SQL Server 2005 as Database.
In the last few days I noticed that the app is down sometimes. To analyze the problem I looked at the activity monitor in SQL Management Studio. I can see there approximately 170 processinfos.
I want to describe the column values of the process infos:
Process-ID: Unique ID and a red down-showing-arrow-icon
User: My UserDatabase: My DatabaseStatus: sleepingCommand: AWAITING COMMANDApplication: .Net SqlClient Data Provider
When I click Locks by Object, I can see the IDs of the Processinfos. Again I will show some colums:Type: DATABASERequirementtype: LOCKRequirementstate: GRANTOwnertype: SHARED_TRANSACTION_WORKSPACEDatabase: My Database
So my question is, does this mean, that i have locked the db? How are they handled? For example I have a windows service, which is doing checks in db every 10 seconds. I can see, that each check generates a new processinfo?
Is this usual, or am I doing something wrong?
Thnaks for help,Byeee
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Jul 9, 2001
When I run a select statement : select 'X' from table1 where c1 = condition locking on indexes behaves as expected
However if I run select 1 from table1 where c1 = condition locking on indexes goes wild locking pages and rows on indexes that are not even referenced in the query. Any ideas Why?
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Dec 29, 2000
Hello All,
I'm just migrating from oracle to SQL.Can anybody tell me that how effectively I can use Row level locking in SQL? If tow users are attemping to
Moify same record how i can deal it in Back end(SQL)?
Thanks in Advance.
Suchee
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Sep 25, 2000
currently im using NT 4 (SP 6a), Intel Pentium III 600 (DUal processor) and 1GB RAM.
the problem that i facing now is DEADLOCK. the lock type in my database is 'DB type', how can i change to 'KEY' type or 'TAB' type???
pls help me and thanx in advance... :)
from comel
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