我更喜欢使用CREATE-ALTER
方法(而不是语法),有两个原因:
- 权限问题(使用
DROP-CREATE
需要重新创建权限)
- 对象ID问题(修改对象不会改变其ID)
DROP-CREATE
示例:
CREATE PROCEDURE dbo.my_proc
AS
SELECT *
FROM dbo.a
WHERE i < 10;
GO
SELECT OBJECT_ID('dbo.my_proc');
GO
DROP PROCEDURE IF EXISTS dbo.my_proc;
GO
CREATE PROCEDURE dbo.my_proc
AS
SELECT *
FROM dbo.a
WHERE i < 10;
GO
SELECT OBJECT_ID('dbo.my_proc');
GO
DB Fiddle
我们可以看到object_id
已经改变。
示例2:CREATE-ALTER
CREATE PROCEDURE dbo.my_proc2
AS
SELECT *
FROM dbo.a
WHERE i < 10;
GO
SELECT OBJECT_ID('dbo.my_proc2');
GO
CREATE OR ALTER PROCEDURE dbo.my_proc2
AS
SELECT *
FROM dbo.a
WHERE i < 10;
GO
SELECT OBJECT_ID('dbo.my_proc2');
GO
DB Fiddle
在这种情况下,object_id
保持不变。
当出现以下示例场景时,可能会导致一些问题。假设我们使用SQL Server 2016查询存储过程,并强制使用特定的查询计划。
DROP-CREATE
USE T1;
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[a]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[a](
[i] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY,
[g] [uniqueidentifier] NULL,
[z] VARCHAR(10)
);
END
GO
INSERT INTO dbo.a(g, z)
SELECT NEWID(), number
FROM (SELECT CAST([key] AS INT) AS number
FROM OPENJSON( '[1' + REPLICATE(',1',3000-1)+']')
) AS num
GO 5
CREATE PROCEDURE dbo.my_proc
AS
SELECT *
FROM dbo.a
WHERE z LIKE '12%'
AND 1 = (SELECT 1);
GO
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
GO
CREATE NONCLUSTERED INDEX IX_dbo_a_z
ON dbo.a([z] ASC) INCLUDE ([i], [g]);
GO
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
DROP PROCEDURE IF EXISTS dbo.my_proc;
GO
CREATE PROCEDURE dbo.my_proc
AS
SELECT *
FROM dbo.a
WHERE z LIKE '12%'
AND 1 = (SELECT 1);
GO
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
第一次执行:
![DC1](https://istack.dev59.com/SI2Rc.webp)
添加索引并执行:
![enter image description here](https://istack.dev59.com/Q4B4P.webp)
强制计划:
![enter image description here](https://istack.dev59.com/fkVU0.webp)
另一个执行:
![enter image description here](https://istack.dev59.com/aRQio.webp)
DROP-CREATE
之后:
![enter image description here](https://istack.dev59.com/4V3tz.webp)
创建-更改
USE T2;
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[a]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[a](
[i] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY,
[g] [uniqueidentifier] NULL,
[z] VARCHAR(10)
);
END
GO
INSERT INTO dbo.a(g, z)
SELECT NEWID(), number
FROM (SELECT CAST([key] AS INT) AS number
FROM OPENJSON( '[1' + REPLICATE(',1',3000-1)+']')
) AS num
GO 5
CREATE PROCEDURE dbo.my_proc
AS
SELECT *
FROM dbo.a
WHERE z LIKE '12%'
AND 1 = (SELECT 1);
GO
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
GO
CREATE NONCLUSTERED INDEX IX_dbo_a_z
ON dbo.a([z] ASC) INCLUDE ([i], [g]);
GO
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
GO
CREATE OR ALTER PROCEDURE dbo.my_proc
AS
SELECT *
FROM dbo.a
WHERE z LIKE '12%'
AND 1 = (SELECT 1);
GO
EXEC dbo.my_proc;
EXEC sp_query_store_flush_db;
SELECT qsq.query_id,
qsq.query_text_id,
qsq.context_settings_id,
qsq.[object_id],
OBJECT_NAME(qsq.[object_id]) AS [object_name],
qsp.is_forced_plan,
qsqt.query_sql_text,
qsrs.count_executions,
CAST(qsp.query_plan AS XbML) AS sql_query_plan
FROM sys.query_store_query qsq
JOIN sys.query_store_query_text qsqt
ON qsq.query_text_id = qsqt.query_text_id
JOIN sys.query_store_plan qsp
ON qsq.query_id= qsp.query_id
JOIN sys.query_store_runtime_stats qsrs
ON qsrs.plan_id = qsp.plan_id
WHERE query_sql_text LIKE '%dbo.a%'
AND qsq.[object_id] <> 0
ORDER BY qsq.query_id;
首次执行:
![enter image description here](https://istack.dev59.com/RDal4.webp)
添加索引并执行:
![enter image description here](https://istack.dev59.com/WcOit.webp)
强制执行计划:
![enter image description here](https://istack.dev59.com/ed7t2.webp)
另一次执行:
![enter image description here](https://istack.dev59.com/sKQC5.webp)
在 CREATE-ALTER
后:
![enter image description here](https://istack.dev59.com/xXkqr.webp)
结果
使用 Drop-Create 我们失去了强制执行计划。
CREATE OR ALTER
语句。喔耶! - ruffin