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1918661 - Mixed data and log database takes long to recover - SAP ASE

Symptom

  • Database recovery always takes (much) longer than other ASEs within same server
  • The errorlog shows only 1 log record for the REDO pass, but still takes considerable time to recover
    • Times observed can be 10s of minutes or even hours depending on database size
  • In the errorlog, there is a time gap between the REDO pass and the timestamp messages
  • Online database (very) slow
  • Recovery of a very large database with mix data and log takes hours
  • Here is an example from the error log:

00:01:00000:00001:2013/08/09 14:55:12.46 server Started REDO pass for database 'database_name'. The total number of log records to process is 1.
00:01:00000:00001:2013/08/09 14:55:12.47 server Completed REDO pass for database 'database_name'.
00:00:00000:00001:2013/08/09 15:06:10.06 server Timestamp for database 'database_name' is (0xc17b, 0x31f7b353). ---> 10 mins gap
00:00:00000:00001:2013/08/09 15:06:10.06 server Recovery of database 'database_name' will undo incomplete nested top actions.


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Environment

  • SAP Adaptive Server Enterprise (ASE) 15.5 and above

Product

SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0 ; Sybase Adaptive Server Enterprise 15.5

Keywords

MDL (Mixed data and Log), slow recovery, sp_logdevice, CR#657529, CR657529, 657529 , KBA , sap adaptive server enterprise , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Product Enhancement

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