Me Contact Me !!! SQL Server FORCESEEK Hint February 22nd, 2013 Vinod Kumar Generally I am not a big fan of using hints inside SQL Server. Having said hangfire query processor could not produce a query plan because of the hints defined in this query that, have seen many customers use wrong hints and not knowing what they
Submit The Query Without Specifying Any Hints And Without Using Set Forceplan.are used for. From SQL Server 2008, there were several interesting new hints introduced that are lesser known to developers. One
With Forceseeksuch hint is around FORCESEEK. Please use this with care and after proper testing in your environment. The FORCESEEK table hint instructs the optimizer to only use an index seek (clustered or non-clustered index)
Query Processor Could Not Produce A Query Plan Because Of The Hints Defined In This Query Hash Joinas the access path for a given table. If you also specify an index hint, it will only produce a query plan with a seek on the specified index. If an index seek plan is not found, or is not found using the specified index, the query compilation will fail with error 8622: Msg 8622, Level 16, State 1, Line 1 Query processor could not produce a query msg 8622 plan because of the hints defined in this query. Resubmit the query without specifying any hints and without using SET FORCEPLAN. With only an index hint we can force the use of a particular index but we cannot force an index seek. If you forced a particular index, the query might still perform a scan instead of an index seek. Here is below is one such example: CREATE TABLE test (c1 INT NOT NULL PRIMARY KEY, c2 INT) GO CREATE INDEX i ON test (c2) GO SET SHOWPLAN_TEXT ON GO SELECT * FROM test WHERE c1 = 0 or c2 = 100 SELECT * FROM test WITH (INDEX(1)) WHERE c1 = 0 or c2 = 100 GO SET SHOWPLAN_TEXT OFF The output will show: StmtText ------------------------------------------------- |-Index Scan(OBJECT:([tempdb].[dbo].[test].[i]), WHERE:([tempdb].[dbo].[test].[c1]=(0) OR [tempdb].[dbo].[test].[c2]=(100))) (1 row(s) affected) StmtText ------------------------------------------------- |-Clustered Index Scan(OBJECT:([tempdb].[dbo].[test].[PK__test__3213663B2D517BEF]), WHERE:([tempdb].[dbo].[test].[c1]=(0) OR [tempdb].[dbo].[test].[c2]=(100))) Now if we try to use the FORCESEEK hint to the above query like: SELECT * FROM test WITH (FORCESEEK) WHERE c1 = 0 or c2 = 100 If the query doesn’t get satisfied using this hint, we will still get the error 8622. And the output is interesting to see for above query: StmtText ----------------------------
★★★★★★★★★★★★★★★ Craig FreedmanApril 28, 20099 0 0 0 In this post, I want to take a look at how two seemingly unrelated features of SQL Server can interact to cause a option hash join problem. The idea for this post came from a question submitted by a reader. query hints Let's begin. Consider the following trivial schema and query: CREATE TABLE T1 (A INT, B INT)CREATE TABLE T2 (A INT, sql server index hint B INT) SELECT *FROM T1 INNER JOIN T2 ON T1.A = T2.AWHERE T1.B = 0OPTION (HASH JOIN) Not surprisingly, this query yields the following plan: |-Hash Match(Inner Join, HASH:([T1].[A])=([T2].[A]), RESIDUAL:([T2].[A]=[T1].[A])) |-Table Scan(OBJECT:([T1]), WHERE:([T1].[B]=(0))) |-Table http://blogs.extremeexperts.com/2013/02/22/sql-server-forceseek-hint/ Scan(OBJECT:([T2])) In fact, this query yields this plan with or without the hint. Now let's make a small modification to the WHERE clause of the query see what happens: SELECT *FROM T1 INNER JOIN T2 ON T1.A = T2.AWHERE T1.A = 0OPTION (HASH JOIN) Now this query yields the following error message: Msg 8622, Level 16, State 1, Line 1 Query processor could not produce a query plan because https://blogs.msdn.microsoft.com/craigfr/2009/04/28/implied-predicates-and-query-hints/ of the hints defined in this query. Resubmit the query without specifying any hints and without using SET FORCEPLAN. What happened? Why does this seemingly innocuous change to the query cause it to fail? To find the answer, let's run the query without the HASH JOIN hint and look at the plan: SELECT *FROM T1 INNER JOIN T2 ON T1.A = T2.AWHERE T1.A = 0 |-Nested Loops(Inner Join) |-Table Scan(OBJECT:([T2]), WHERE:([T2].[A]=(0))) |-Table Scan(OBJECT:([T1]), WHERE:([T1].[A]=(0))) There are two things about this plan that are especially notable: First, the plan includes the predicate "T2.A = 0". Although we did not specify this predicate in the original query, SQL Server derives it from the predicates that we did specify. This derivation is a good thing. It allows SQL Server to filter out rows from the scan of T2 earlier than would otherwise be possible. Second, the original equijoin predicate "T1.A = T2.A" appears nowhere in this plan. This predicate is redundant with the original predicate "T1.A = 0" and the derived predicate "T2.A = 0" so SQL Server eliminates it. Normally, eliminating a redundant predicate is a good thing. By the time the rows from the scans reach the join, there is no reason to evaluate t
Msg 8622, Level 16, State 2, Line 2 Query processor could not produce a query plan because of the hints defined in this query. Resubmit the query without specifying any hints and http://www.sql-server-performance.com/2009/query-processor-could-not-produce-a-query-plan/ without using SET FORCEPLAN. Severity level: 16. Description: This error message appears when you https://github.com/elastic/elasticsearch/issues/8622 try to specify conflicting hints in a query. Consequences: The T-SQL statement can be parsed, but causes the error at runtime. Resolution: Error of the Severity level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be run this way. Consider removing the hints or changing query processor them. Versions: All versions of SQL Server. Example(s): IF OBJECT_ID (‘dbo.t') IS NOT NULL DROP TABLE dbo.t; CREATE TABLE dbo.t ( c1 int PRIMARY KEY, s1 varchar(20) ); GO SELECT * FROM dbo.t WITH (INDEX = 0 INDEX = 1); Remarks: In the above example we try to execute a query with a conflicting specification of query hints. This raises the error. ASK A QUESTION query processor could Tweet Array Errors No comments yet... Be the first to leave a reply! Leave a Reply Click here to cancel reply. Popular Latest Tags Setting up Transactional Replication in SQL Server 2008 R2. November 30, -0001 Backing Up a SQL Server Database Directly Onto a Remote Server November 30, -0001 Recovering a SQL Server Database from Suspect Mode November 30, -0001 SQL Server T-SQL Tuning - NOT IN and NOT Exists November 30, -0001 SQL Server T-SQL Tuning - Temp Tables, Table Variables and Union November 30, -0001 SQL Server Logical Reads – What do they really tell us? October 4, 2016 Physical Join Operators in SQL Server - Hash Operator September 21, 2016 Physical Join Operators in SQL Server - Merge Operator August 25, 2016 Techniques to Monitor SQL Server memory usage August 12, 2016 Recovering a SQL Server Database from Suspect Mode August 7, 2016 Forum posts... 2008 R2 2012 Agent AlwaysOn Analysis Services Backup Clustering Data Mining deadlock Denormalization Disaster Recovery Email Entity Framework Excel Geo high availability Identity Identity Column index Jobs Log Shipping mail Monitoring Oracle Query Query Plan range Replication Reporting Services Report Manager Restore Security Spatial Data SSIS SSMS SSRS Stored Procedures T-SQL task Temp Table Transactional Replication transactions TSQL Tu
Sign in Pricing Blog Support Search GitHub This repository Watch 1,768 Star 18,749 Fork 6,384 elastic/elasticsearch Code Issues 1,019 Pull requests 86 Projects 0 Pulse Graphs New issue wrong error message in DateFieldMapper.parseStringValue(String value) #8622 Closed proofy opened this Issue Nov 24, 2014 · 1 comment Projects None yet Labels None yet Milestone No milestone Assignees No one assigned 1 participant proofy commented Nov 24, 2014 no use of a String pattern converter, but the error message give you a hint to use a format and not only long numbers. proofy commented Nov 24, 2014 I can't reproduce it. proofy closed this Nov 24, 2014 Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc. Terms Privacy Security Status Help You can't perform that action at this time. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session.