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Dec 11, 2018 at 12:56 AM

Startup hang on "enq: OW - initialization"

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Hello,

Occasionally our system startup hangs. The database opens okay, but all database accesses hang with "enq: OW - initialization"

This has started to happen only after we used Oracle TDE to encrypt tablespaces. TDE is setup to automatically open the Oracle Wallet.

Restarting the database resolves the issue.

I noticed that the hanging sessions seem to wait for the SMON process, which is accessing datablocks in UNDO segments. The database was shutdown normally with SHUTDOWN IMMEDIATE.

What can cause hangs on "enq: OW - initialization"??

Kind regards,

Peter