2020479 - Buffer Sync Failiure because of sequence DDLOG_SEQ wrongly created

Symptom

SAP Netweaver system got buffer sync errors in work process traces. In transaction RZ11 parameter "rdisp/bufrefmode =sendon,exeauto" is configured for all application instances, but still buffer sync errors appear in some scenario.

In the developer trace file below error can be found:

B n[collect_new_with_gaps]: sequence gap [-2147202087, -2147202055] found at 20140422145147

B dbsync[collect_new_with_gaps]: sequence -2147202087 is missing since 20140422144947 (for 120 seconds)

B dbsync[collect_new_with_gaps]: max. wait time (60) exceeded,sequence -2147202087 discarded or

B dbsync[collect_new_with_gaps]: Sequence gap -2147200282 (found at 20140422151347) has now (20140422151547) vanished.

Environment

Database ORACLE, Operating System-AIX, R/3 Release-700

Product

SAP ERP 6.0

Keywords

buffer synchronization, DDLOG_SEQ sequence, sequence gaps , KBA , BC-DB-ORA-SYS , Database Interface / DBMS , Problem

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