The above profiler snapshot shows that the SQL Server runs an update statement to set the column values as specified by the default constraint. An update is a fully logged statement and thus takes 19 seconds to update 100000 rows. This gets worst with increase in data. The easiest way to ...
You can apply the default value in batches so the table is not locked for any significant period of time (assuming the table has a clustered index). SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also...
Reports attempts to create NOT NULL columns without DEFAULT values. Example (Microsoft SQL Server): CREATE TABLE foo (a INT, b INT) ALTER TABLE foo ADD c INT NOT NULL; By default, a column holds NULL values. In the example, we use the NOT NULL constraint that enforces a column not t...
Transact-SQL USE AdventureWorks2008R2; GO IF OBJECT_ID ('dbo.T1', 'U') IS NOT NULL DROP TABLE dbo.T1; GO CREATE TABLE dbo.T1 ( column_1 AS 'Computed column ' + column_2, column_2 varchar(30) CONSTRAINT default_name DEFAULT ('my column default'), column_3 rowversion, column_4 ...
Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot Table query Adding a partition scheme to an existing table. Adding a ...
Add a Constraint to restrict a generic to numeric types Add a html content to word document in C# (row.Cells[1].Range.Text) Add a trailing back slash if one doesn't exist. Add a user to local admin group from c# Add and listen to event from static class add characters to String ad...
On larger tables, adding a NOT NULL column with a default value can lock the table for a long time. It may make sense to first add the column as NULL, populate the values in chunks, and then add a NOT NULL constraint after the fact. ...
The referential integrity checks from the foreign key constraint prevented the incorrect row from being deleted, even though it had the "correct" primary key value from the primary. This behaviour is documented in MySQL: 4.1.1 Replication and AUTO_INCREMENT: Adding an AUTO_INCREMENT column to a...
children, only children loaded in memory will be deleted when you delete the parent. This means, unless you have a corresponding cascade delete rule specified in the database, orphan records might be left in the database, or the delete might fail because of potential foreign key constraint ...
(SQL Exception while executing the following:INSERT INTO public.customfieldvalue (ID, ISSUE, CUSTOMFIELD, UPDATED, PARENTKEY, STRINGVALUE, NUMBERVALUE, TEXTVALUE, DATEVALUE, VALUETYPE) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) (ERROR: duplicate key value violates uni...