What is SRUJet?

Question

I see in Event log many error entries :

svchost (1500) SRUJet: An attempt to open the file "C:\Windows\system32\SRU\SRUDB.dat" for read / write access failed with system error 5 (0x00000005): "Access is denied. ". The open file operation will fail with error -1032 (0xfffffbf8).

The key in the event log is ESENT : ESENT 490 error

I already made that error to disappear by setting Everyone - full control to the C:\Windows\system32\SRU\ folder....

But :

Question

1) What is SRUJet ?
2) What's the purpose of the C:\Windows\system32\SRU\ folder ?
3) What is ESENT?

Answer 1

SRUJet is a database engine working with database file srudb.dat.

This thread shows that:

• You should be safely able to delete srudb.dat and Windows should re-create it.
• The functionality is part of Diagnostic Policy Service.

You can post permissions of the file for further details.

Answer 2

Stop the Diagnostic Policy Service and delete srudb.dat. Worked for me.

To stop the Diagnostic Policy Service: + R -> Type in services.msc -> press Enter -> Scroll down and double-click on Diagnostic Policy Service -> Click the Stop button.

Answer 3

3) What is ESENT?

ESENT is the Windows "Extensible Storage Engine" runtime, and is essentially a data store creator for applications such as Desktop Search. In the context of your question, ESENT is used by the Diagnostic Policy Service to build the srudb.dat data file.