SQL Server VARBINARY INSERT锁定表超过30分钟

Question

I have a simple table I create and populate:

USE MyDB
GO

CREATE TABLE dbo.mytable (
    my_id INTEGER IDENTITY(1,1) NOT NULL,
    description VARCHAR(MAX) NOT NULL,
    image VARBINARY(MAX) NOT NULL
);

INSERT INTO dbo.mytable (
    description, image
)
SELECT
    'foo',
    CAST('bar' AS VARBINARY(MAX));

The query finishes successfully. Then I try:

SELECT * -- Or SELECT COUNT(*)
FROM MyDB.dbo.mytable;

And wait forever...

Running the query found here I see 5 exclusive locks (3 X, 2 IX) that aren't released for ~30 minutes. Once the locks are released SELECT queries finish almost instantly.

Why are these locks kept for so long? What can I do to reduce the time between INSERT and SELECT?

*Note that the INSERT in the above example was used as a manual test after attempting to insert an image from one of my applications exhibited the same behavior. The image used is ~14.2kB in size.

Answer 1

It looks like you have open transaction (probably implicit). I suggest to add COMMIT after INSERT :

INSERT INTO dbo.mytable (description, image)
SELECT 'foo',
        CAST('bar' AS VARBINARY(MAX));

COMMIT;