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Since in some cases it makes more sense using a different execution plan. What happens is probably that for different queries, the optimization stage takes into account the queries' parameter values. What worked for us was to ignore the cached execution plan for the slow queries. SQL Server caches execution plans, you can see it using: select * from sys.dm_exec_cached_plans We consulted a very good read about query plans. We had a similar problem that turned out to be due to caching. If they are different, then the execution plan is probably different, which points me back to the first thing I mentioned: the SET options. Compare the CPU, reads, writes and duration. You could use SQL Server Profiler to compare the executions as they come in via JDBC and as you run it via SSMS.
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If it is still slow, then the problem must be in the driver or database. If it flies, that suggests the bottleneck is in your former processing of the result set. See Set a default row prefetch in SQL Server using JDBC driver for details.Īlso, what are you doing in your while (rs.next()) loop? Try doing nothing other than reading a column, like rs.getInt(1). However, there is an internal method in the driver for it. Apparently, the SQL Server driver does not support that method. On Oracle, I have seen huge impacts by playing with the setFetchSize method on the Statement / PreparedStatement object.
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ARITHABORT comes to mind as one that I have seen cause a difference in performance between SSMS and JDBC driver. Compare a SPID from a JDBC connection and a SSMS connection. When you start a trace, make sure ExistingConnections is selected. I would also recommend checking the connections' SET options via SQL Server Profiler. Inner join PROPERTIES as PROPERTY on PROPERTY.OBJECT = CHILD.IDENTIFIERĬase when PARENT.IDENTIFIER is null then 1 else 0 end, Left outer join OBJECTS as PARENT on RELATIONS.PARENT = PARENT.IDENTIFIER Left outer join RELATIONS on RELATIONS.CHILD = CHILD.IDENTIFIER PROPERTY.TARGET as PROPERTY_TARGET - a date PROPERTY.DESCRIPTION as PROPERTY_DESCRIPTION, PROPERTY.IDENTIFIER as PROPERTY_IDENTIFIER,
Microsoft sql server jdbc driver 4.0 update#
UPDATE I've checked and found that switching from PreparedStatement to Statementdoes not improve things in my case (it apparently can help in other cases). "responseBuffering=adaptive" should be the normal default by now.When the client stalls it still shows only relatively light CPU load, unlike what I would expect from heavy garbage collection.Two further observations that seem somewhat strange and that perhaps point to a different root cause entirely: What could be going wrong here and how can I instruct the a Microsoft SQL Server (not just suggest to it - programmatically in Java) that it must return rows in smaller chunks rather than all at once or improve JDBC query times by some other measures. After the connection is established, I see this property (among several others) in the result from connection.getMetaData().getURL(), but[ connection.getClientInfo(responseBuffering) returns null, and what is more the client is still stalling. I tried to tackle this by appending responseBuffering=adaptive" to the URL passed to DriverManager.getConnection(). The same test has worked fine also on the client with an earlier version of the database where only approx. When I issue the same query from the client, it stalls. When I run the corresponding query on the remote server's Microsoft SQL Server Management Studio, it returns approx. I am dealing with what is apparently a performance issue while retrieving a relatively large ResultSet from a remote Microsoft SQL Server 2012 to a Java client that uses Microsoft JDBC Driver 4.0.