Tuesday, February 24, 2015

Performance Killers in MSSQL

  • Frequent recompilation of execution plans
  • Inaccurate statistics
  • Excessive use or improper configuration of tempdb
  • Excessive blocking and deadlocks
  • Excessive fragmentation
  • Improper use of cursors
  • Improper configuration of the database log
  • Non-reusable execution plans
  • Non-set-based operations, usually T-SQL cursors
  • Poor database design
  • Poor query design
  • Poor indexing
  • Poor execution plans, usually caused by parameter sniffing

Monday, February 2, 2015

Sp_rename fails : Either the parameter @objname is ambiguous or the claimed @objtype (object) is wrong

You can get below error if you have ‘DOT’ in between your constraint name. SP_rename fails because object_id(ContraintnamewithDOT) returns NULL for constraint objects with DOT (.) in their name.

Sp_rename fails with Msg 15248, Level 11, State 1, Procedure sp_rename, Line 357
Either the parameter @objname is ambiguous or the claimed @objtype (object) is wrong.

The solution to above problem is to drop and recreate the constraint without DOT