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2558404 - The buffer synchronization has not been called for N seconds

Symptom

You find on System Log (transaction SM21) following entry:
   01:23:45 DIA  <wp_nr> 000 SAPSYS                    BS  5 The buffer synchronization has not been called for N seconds

Checking involved work process trace file (dev_w<wp_nr>), it shows:
   B  dbsync[db_syexe]: { wait=0, call_no=106851, current_ts=20171019100930, last_counter=6426772
   B  *** ERROR => dbsync[check_sync_interval]: N seconds passed since last synchronisation
     last sync: 20171019100716(1508400436), now: 20171019100930(1508400570)  [dbsync.c     4483]
   B  {root-id=005056992F441EE7AD949A930B1D2691}_{conn-id=00000000000000000000000000000000}_0
   B  ***LOG BS5=> Buffer synchronisation has not been called for N seconds [dbsync       4485]

Buffer synchronization is normally called in intervals of 'rdisp/bufreftime' seconds, which is 120 seconds by default.
If time period since last synchronization is greater than this value, then the System Log warning will be entered:
    BS  5 The buffer synchronization has not been called for N seconds


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Environment

SAP NetWeaver system

Product

SAP NetWeaver all versions

Keywords

dbsync, BS 5, BS5, buffer synchronisation, buffer synchronization, buffer synchronisation has not been called,
rdisp/bufreftime, seconds passed since last synchronisation, synchronization,
DpTimeCheck, buffer refresh, buffer refresh requests, SM5B, AL12 , KBA , BC-CST-DP , Dispatcher, Task Handler , BC-CST , Client/Server Technology , Problem

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