Scripts

Technical Article

Check Full Recovery DBs Have Tran Log Backups

A quick procedure to check which full recovery databases have not had a tran log backup in the given period (default is 7 days). This could mean that the recovery mode might need changing or the transaction log backup jobs need investigating.

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2011-09-22 (first published: )

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Technical Article

Locate primary key - foreign key relations

Recently one of my friend was doing some investigation in a new/unknown database and had really hard time locating the primary key – foreign key relations. Like it’s really tough to locate these relations when not enforced at database level in terms of primary key and foreign key constraints. But generally all database developers keep […]

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2011-09-14 (first published: )

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return:

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

See possible answers