调用存储过程时何时锁定表以进行插入
我有一个用于报告目的的表，每次用户从网络运行报告时都会插入数据。根据报告的参数，插入内容可以从单行到几千行不等。用于插入的 select 语句最多可以运行 60 秒。它已经过优化，但由于数据库的复杂性，我无法进一步调整它。我的问题是 - 表何时被锁定以进行插入？是调用存储过程的时候、执行select语句的时候、还是select语句执行完毕的时候？我想限制表的锁定时间，以便在运行最多 50,000 行的大型报表时其他用户不会受到影响。
前任。
INSERT INTO reportTable
SELECT
Column a,
Column b
FROM
Table a
INNER JOIN
Table b
on b.ident = a.Bident
谢谢
I have a table that is used for reporting purposes and data is inserted each time a user runs a report from the web. The insert can vary from a single row to several thousand depending on the parameters of the report. The select statement used for the insert can run for up to 60 seconds for the insert. It has been optimized but due to the complexity of the database i can not tune it further. My question is - when is the table locked for insert? Is it when the stored procedure is called, when the select statement is executed, or when the select statement is finished executing? I would like to limit the time the table is locked so other users are not affected when a large report, up to 50,000 rows, is run.
ex.
INSERT INTO reportTable
SELECT
Column a,
Column b
FROM
Table a
INNER JOIN
Table b
on b.ident = a.Bident
Thank you
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只需运行此命令即可：
不再担心插入锁阻塞报告。请参阅选择基于行版本控制的隔离级别。
Just run this:
And stop worrying about insert locks blocking reports. See Choosing Row Versioning-based Isolation Levels.