SQL Server??????????
???????????? ???????[ 2016/9/13 10:19:44 ] ????????????? SQL Server
????SNAPSHOT?????????????????????????????3????????????汾????????3?????????????????????д??????????????????????????????????????????
????????????1??????ж??????
????BEGIN TRAN;
????SELECT productid?? unitprice FROM Production.Products WHERE productid = 2;
??????????2?и????????
????BEGIN TRAN;
????UPDATE Production.Products SET unitprice += 1.00 WHERE productid = 2;
????COMMIT TRAN;
?????????????1??????????????????????
????UPDATE Production.Products SET unitprice = 21.00 WHERE productid = 2;
????COMMIT TRAN;
???????????????????????????????3??????????????£?
??????? 3960?????? 16???? 2???? 1 ??
?????????????????????3?????????????????????'AdventureWorks2012'??????????????????????? 'Production.Products'???????????????????????????????????????С???????????????? update/delete ?????????
????READ COMMITED SNAPSHOT
????READ COMMITED SNAPSHOT???????а汾??????????????SANPSHOT??????????????????“???”???????????????а汾???????????????????????????а汾?????????????????3???????????????????????????????????????????????????????????????
???????????????????????READ COMMITED SNAPSHOT?????????
????ALTER DATABASE dbname SET READ_COMMITED_SNAPSHOT ON;
?????????????????????????READ COMMITED SNAPSHOT
??????????1????????????
????BEGIN TRAN;
????UPDATE Production.Products SET unitprice += 1.00 WHERE productid = 2;
????SELECT productid?? unitprice FROM Production.Products WHERE productid = 2;
???????к??????
????productid unitprice
????---------- ----------
????2 20.00
??????????2?У???????????????????2????????????????
????BEGIN TRAN;
????SELECT productid?? unitprice FROM Production.Products WHERE productid = 2;
???????к?????????汾??
????productid unitprice
????---------- ----------
????2 19.00
??????????????1????????
????COMMIT TRAN;
?????????????????а汾??????仯??20.00????????????????2????ζ?????2???????????????
????SELECT productid?? unitprice FROM Production.Products WHERE productid = 2;
????COMMIT TRAN;
?????????????£?
????productid unitprice
????---------- ----------
????2 20.00
???????????????????????漰???????????????????SPASVOС??(021-61079698-8054)?????????????????????????
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???????sql server 2000??????????????SQL Server???????????????????λ?????SQL Server??????????????????????????????SQL Server??Azure SQL??SQL SERVER ?????????????汾??????SQL Server??WITH (NOLOCK)SQL Server??????????????DML??????????SQL Server????????????????????SQL Server??????SQL Server???????????Ч?????????SQL Server?????????????????SQL Server?????????????????SQL Server????????SQL SERVER????????SQL Server????δ???????SQL SERVER??????????
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?????????App Bug???????????????????????Jmeter?????????QC??????APP????????????????app?????е????????jenkins+testng+ant+webdriver??????????????JMeter????HTTP???????Selenium 2.0 WebDriver ??????