It is the logical collection of statements or steps which can be succeeded or failed. The transaction isolation level determines the duration that locks are held.
This is often referred to as “dirty read” becoz we can read modified data that hasn’t been committed and it could get roll back after you read.
It acquires share locks and waits on any data modified by a transaction in process. This is a SQL “server default”.
Same as read committed but in addition share locks are retained on rows, read for the duration of the transaction.
In other words any row that is read cannot be modified by any other connection until the transaction commits or Roll back.
Same as reputable read but in addition no other connection can insert the rows, if new rows would appear in select statement already issued.
In other words if we issue a select statement in transaction using the serializable isolation level we will get the same exact result set if we issue the select statement again within the same transaction.
a. Required → if transaction exists join it, else start a new one.
b. Supported → if transaction exists join it (this is the default).
c. Not supported → don’t join in existing transaction.
It is a process of running a particular task [is, as or set of SQL queries]. At a stipulated time. (Schedule time).
Eg: running a file system package on every Monday at morning 9:00 am.
Step name: SSIS-step
Type: SSIS package
Package source: file system
Package: specify the package location
Schedule → new
Name: repeatable run.
Schedule type: recurring
Recurs every: 1 week(s) on Monday
Click ok → ok
|SSAS||SQL Server DBA|
|Team Foundation Server||BizTalk Server Administrator|
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