'minact-scn: useg scan erroring out with error e:1555' (Doc ID 1297450.1)

Last updated on MAY 09, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Information in this document applies to any platform.

Symptoms


The database alert log file show frequent errors:

minact-scn: got error during useg scan e:1555 usn:10
minact-scn: useg scan erroring out with error e:1555a


The MMON process generates trace files which shows:

minact-scn master-status: grec-scn:0x0000.1ae6dd78 gmin-scn:0x0000.00000000 gcalc-scn:0x0000.00000000
minact-scn master-status: grec-scn:0x0000.1ae6fb65 gmin-scn:0x0000.00000000 gcalc-scn:0x0000.00000000


The argument e:1555 means ora-1555, but the query from gv$undostat

select inst_id, to_char(begin_time,'MM/DD/YYYY HH24:MI') begin_time, UNXPSTEALCNT, EXPSTEALCNT , SSOLDERRCNT, NOSPACEERRCNT, MAXQUERYLEN
from gv$undostat
where begin_time between to_date('<MM/DD/YYY>','MM/DD/YYYY') and to_date('<MM/DD/YYY>
','MM/DD/YYYY') order by inst_id, begin_time;


does not show errors.

Cause

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