dotnet/Documentation/compatibility/log-file-name-created-by-th...

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## Log file name created by the ObjectContext.CreateDatabase method has changed to match SQL Server specifications
### Scope
Edge
### Version Introduced
4.5
### Source Analyzer Status
Available
### Change Description
When the CreateDatabase method is called either directly or by using Code First with the SqlClient provider and an AttachDBFilename value in the connection string, it creates a log file named filename_log.ldf instead of filename.ldf (where filename is the name of the file specified by the AttachDBFilename value). This change improves debugging by providing a log file named according to SQL Server specifications.
- [ ] Quirked
- [ ] Build-time break
### Recommended Action
If the log file name is important for an app, the app should be updated to expect the standard _log.ldf file name format.
### Affected APIs
* `M:System.Data.Objects.ObjectContext.CreateDatabase`
### Category
Entity Framework
[More information](https://msdn.microsoft.com/en-us/library/hh367887(v=vs.110).aspx#sql)
<!-- breaking change id: 59 -->