sql Server 2008 Linked Server和ad-hoc INSERT引起快速内存泄漏,最终导致服务器变得无响应,并以下列错误结束：
Msg 701,Level 17,State 123,Server BRECK-PC\sqlEXPRESS,Line 2 There is insufficient system memory in resource pool 'internal' to run this query. Location: qxcntxt.cpp:1052 Expression: cref == 0 SPID: 51 Process ID: 1880
服务器保持不响应,直到重新启动sql Server.
正在使用的软件：
> Windows Vista Ultimate 64位版本6001 SP1
> Microsoft sql Server 2008(SP1) – 10.0.2734.0(X64)2009年9月11日14:30:58版权所有(c)1988-2008 Windows NT 6.0上的高级服务(64位)的Microsoft Corporation Express Edition(Build 6001： Service Pack 1)
> sql Anywhere 11.0.1.2276中的SAOLEDB.11驱动程序
将最大服务器内存(MB)设置为2048没有帮助.
将各种-g值(例如-g256;)添加到服务器启动参数没有帮助.
使用DBCC FREESYstemCACHE(‘ALL’),DBCC FREESESSIONCACHE和DBCC FREEPROCCACHE没有帮助.
即使它包含对涉及链接服务器使用的内存泄漏症状的修复,将Cumnulative更新包4安装到sql Server 2008 Service Pack 1也没有帮助.
从INSERT分离SELECT … ROW_NUMBER()OVER …查询没有帮助.实验表明,复杂的SELECT没有引起内存泄漏,INSERT没有.
更改代码以使用ad-hoc“INSERT INTO OPENROWSET”语法而不是链接的服务器没有帮助;下面的代码显示了链接的服务器使用情况.
sysinternals.com Process Explore实用程序显示内存使用情况与sqlserver.exe相关联,而不是sql Anywhere OLEDB驱动程序SAOLEDB.11使用的DLL.
请注意,链接服务器(代理表)的sql Anywhere版本可以正常工作,以便在单个事务中将“sql”2008表中的190万行“拉”为sql Anywhere 11数据库.这里所示的逻辑是尝试使用链接的服务器功能来“推”行;方向相同,语法不同.
代码如下执行EXECUTE copy_mss_t2三或四次之后,4G的RAM已耗尽：
EXEC sys.sp_configure N'show advanced options',N'1' GO RECONfigURE WITH OVERRIDE GO EXEC sys.sp_configure N'max server memory (MB)',N'2048' GO RECONfigURE WITH OVERRIDE GO EXEC sys.sp_configure N'show advanced options',N'0' GO RECONfigURE WITH OVERRIDE GO EXEC master.dbo.sp_MSset_oledb_prop N'SAOLEDB.11',N'AllowInProcess',1 GO sp_addlinkedserver @server = 'mem',@srvproduct = 'sql Anywhere OLE DB Provider',@provider = 'SAOLEDB.11',@datasrc = 'mem_PAVILION2' GO EXEC master.dbo.sp_serveroption @server=N'mem',@optname=N'rpc',@optvalue=N'true' GO EXEC master.dbo.sp_serveroption @server=N'mem',@optname=N'rpc out',@optvalue=N'true' GO sp_addlinkedsrvlogin @rmtsrvname = 'mem',@useself = 'false',@locallogin = NULL,@rmtuser = 'dba',@rmtpassword = 'sql' GO CREATE PROCEDURE copy_mss_t2 @from_row BIGINT,@to_row BIGINT,@rows_copied_count BIGINT OUTPUT AS SELECT * INTO #t FROM ( SELECT *,ROW_NUMBER() OVER ( ORDER BY sample_set_number,connection_number ) AS t2_row_number FROM mss_t2 ) AS ordered_mss_t2 WHERE ordered_mss_t2.t2_row_number BETWEEN @from_row AND @to_row; SELECT @rows_copied_count = COUNT(*) FROM #t; INSERT INTO mem..dba.sa_t2 SELECT sampling_id,sample_set_number,connection_number,blocker_owner_table_name,blocker_lock_type,blocker_owner_name,blocker_table_name,blocker_reason,blocker_row_identifier,current_engine_version,page_size,ApproximatecpuTime,BlockedOn,BytesReceived,BytesSent,CacheHits,CacheRead,"Commit",diskRead,diskWrite,FullCompare,IndAdd,IndLookup,Isolation_level,LastReqTime,LastStatement,LockCount,LockName,LockTableOID,LoginTime,LogWrite,Name,NodeAddress,Prepares,PrepStmt,QueryLowMemoryStrategy,QueryOptimized,QueryReused,ReqCountActive,ReqCountBlockContention,ReqCountBlockIO,ReqCountBlockLock,ReqCountUnscheduled,ReqStatus,ReqTimeActive,ReqTimeBlockContention,ReqTimeBlockIO,ReqTimeBlockLock,ReqTimeUnscheduled,ReqType,RequestsReceived,Rlbk,RollbackLogPages,TempFilePages,TransactionStartTime,UncommitOp,Userid,prevIoUs_ApproximatecpuTime,interval_ApproximatecpuTime,prevIoUs_Commit,interval_Commit,prevIoUs_Rlbk,interval_Rlbk FROM #t; GO DECLARE @rows_copied_count BIGINT EXECUTE copy_mss_t2 1110001,1120000,@rows_copied_count OUTPUT SELECT @rows_copied_count GO EXECUTE create_linked_server GO DECLARE @rows_copied_count BIGINT EXECUTE copy_mss_t2 1120001,1130000,@rows_copied_count OUTPUT SELECT @rows_copied_count GO EXECUTE create_linked_server GO
这里是sql Server源表,包含大约1G的数据在190万行中：
CREATE TABLE mss_t2 ( sampling_id BIGINT NOT NULL,sample_set_number BIGINT NOT NULL,connection_number BIGINT NOT NULL,blocker_owner_table_name VARCHAR ( 257 ) NULL,blocker_lock_type VARCHAR ( 32 ) NULL,blocker_owner_name VARCHAR ( 128 ) NULL,blocker_table_name VARCHAR ( 128 ) NULL,blocker_reason TEXT NULL,blocker_row_identifier VARCHAR ( 32 ) NULL,current_engine_version TEXT NOT NULL,page_size INTEGER NOT NULL,ApproximatecpuTime DECIMAL ( 30,6 ) NULL,BlockedOn BIGINT NULL,BytesReceived BIGINT NULL,BytesSent BIGINT NULL,CacheHits BIGINT NULL,CacheRead BIGINT NULL,"Commit" BIGINT NULL,diskRead BIGINT NULL,diskWrite BIGINT NULL,FullCompare BIGINT NULL,IndAdd BIGINT NULL,IndLookup BIGINT NULL,Isolation_level BIGINT NULL,LastReqTime TEXT NOT NULL DEFAULT '1900-01-01',LastStatement TEXT NULL,LockCount BIGINT NULL,LockName BIGINT NULL,LockTableOID BIGINT NULL,LoginTime TEXT NOT NULL DEFAULT '1900-01-01',LogWrite BIGINT NULL,Name VARCHAR ( 128 ) NULL,NodeAddress TEXT NULL,Prepares BIGINT NULL,PrepStmt BIGINT NULL,QueryLowMemoryStrategy BIGINT NULL,QueryOptimized BIGINT NULL,QueryReused BIGINT NULL,ReqCountActive BIGINT NULL,ReqCountBlockContention BIGINT NULL,ReqCountBlockIO BIGINT NULL,ReqCountBlockLock BIGINT NULL,ReqCountUnscheduled BIGINT NULL,ReqStatus TEXT NULL,ReqTimeActive DECIMAL ( 30,ReqTimeBlockContention DECIMAL ( 30,ReqTimeBlockIO DECIMAL ( 30,ReqTimeBlockLock DECIMAL ( 30,ReqTimeUnscheduled DECIMAL ( 30,ReqType TEXT NULL,RequestsReceived BIGINT NULL,Rlbk BIGINT NULL,RollbackLogPages BIGINT NULL,TempFilePages BIGINT NULL,TransactionStartTime TEXT NOT NULL DEFAULT '1900-01-01',UncommitOp BIGINT NULL,Userid VARCHAR ( 128 ) NULL,prevIoUs_ApproximatecpuTime DECIMAL ( 30,6 ) NOT NULL DEFAULT 0.0,interval_ApproximatecpuTime AS ( COALESCE ( "ApproximatecpuTime",0 ) - prevIoUs_ApproximatecpuTime ),prevIoUs_Commit BIGINT NOT NULL DEFAULT 0,interval_Commit AS ( COALESCE ( "Commit",0 ) - prevIoUs_Commit ),prevIoUs_Rlbk BIGINT NOT NULL DEFAULT 0,interval_Rlbk AS ( COALESCE ( Rlbk,0 ) - prevIoUs_Rlbk ) )
以下是sql Anywhere 11中的目标表：
CREATE TABLE sa_t2 ( sampling_id BIGINT NOT NULL,interval_ApproximatecpuTime DECIMAL ( 30,6 ) NOT NULL COmpuTE ( COALESCE ( "ApproximatecpuTime",interval_Commit BIGINT NOT NULL COmpuTE ( COALESCE ( "Commit",interval_Rlbk BIGINT NOT NULL COmpuTE ( COALESCE ( Rlbk,0 ) - prevIoUs_Rlbk ),PRIMARY KEY ( sample_set_number,connection_number ) );
