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SQL Server 2000 SP4 Build 2187. When runing simple SELECT query with INNER joins causing LATCH_EX waittype with huge number of CXPACKET causing consistent high CPU with performance degradation. Indexes are in place with stats updated. Moving data files to different disk didn't make any difference. Execution plans are changing with and without 'TOP' clause. With 'TOP' clause plans are generating with 'INDEX SEEK, Nested Loop' while without 'TOP' clause changing to 'INDEX SCAN, Table Spool, Hash Match, Merge Join'. WHY? Can anyone give some action plan?
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SQL Server 2000 SP4 Build 2187. When runing simple SELECT query with INNER joins causing LATCH_EX waittype with huge number of CXPACKET causing consistent high CPU with performance degradation. Indexes are in place with stats updated. Moving data files to different disk didn't make any difference. Execution plans are changing with and without 'TOP' clause. With 'TOP' clause plans are generating with 'INDEX SEEK, Nested Loop' while without 'TOP' clause changing to 'INDEX SCAN, Table Spool, Hash Match, Merge Join'. WHY? Can anyone give some action plan?

LATCH_EX with CXPACKET causing query performance degradation

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.