Question: What is Source_Database_ID in Sys.Databases and why it is mostly NULL? Very interesting question, I received indeed.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
sysxmitqueue in msdb: Why It Grows and How to Clear It
Sysxmitqueue in msdb fills up when Service Broker messages cannot leave the server. A tested demo in its own database shows the pile, the reason, a one conversation cleanup and the NEW_BROKER reset. The msdb steps follow the same order.
SQL SERVER – DBCC CLONEDATABASE Error – Msg 2601: Cannot Insert Duplicate Key Row in Object ‘sys.sysowners’ With Unique Index ‘nc1’.
Another DBCC CLONEDATABASE error, Msg 2601: cannot insert duplicate key row in object ‘sys.sysowners’. Here is why it happens and the workaround.
SQL SERVER – DBCC CLONEDATABASE Error: Cannot Insert Duplicate Key Row In Object ‘sys.sysschobjs’ With Unique Index ‘clst’.
Learn how to fix: Cannot insert a duplicate key row in object ‘sys.sysschobjs’ with unique index ‘clst’ while using DBCC CLONEDATABASE.
CHECKPOINT Impact on Memory: Watch Dirty Pages Go to Zero
CHECKPOINT impact on memory is easy to measure. This post counts the dirty and clean pages of one database before and after a checkpoint. Dirty pages drop to zero, the clean pages grow by the same amount, and nothing leaves memory.
Profiling a Table’s Data: Nulls, Distinct Values and Lengths
Start profiling a table’s data with null counts, distinct values, lengths, and generated checks that expose misleading column definitions.
Trivial Plan: Why Some Queries Skip Full Optimization
Identify a trivial plan in SSMS and cached XML, understand skipped optimizer work, and compare a more complex query without forcing it.
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