DataPump Import Slow when Constraints Are Enabled (Doc ID 1522567.1)

Last updated on JANUARY 24, 2013

Applies to:

OracleDatabase - Enterprise Edition - Version 11.1.0.7 to 11.2.0.3 [Release 11.1 to 11.2]
Information in this document applies to any platform.

Symptoms

 A DataPump import operation is slow and the tkprof output of the DW process shows the most of the time is in the following query:

 

SQL ID: gkg8anaz384qs
Plan Hash: 1142289748
SELECT C.OBJ#
FROM
SYS.CCOL$ C, SYS.CDEF$ D WHERE C.CON# = :CONID
                  AND C.CON# = D.CON#
         AND D.ENABLED = 1
 AND C.INTCOL# = :COLNUM


call     count       cpu    elapsed       disk      query    current        rows
------- ------  -------- ---------- ---------- ---------- ----------  ----------
Parse       41      0.00       0.02          0          0          0           0
Execute  13043      1.69       3.72          0          0          0           0
Fetch    13043  13509.12   27028.91         13  380840790          0         529
------- ------  -------- ---------- ---------- ---------- ----------  ----------
total    26127  13510.81   27032.67         13  380840790          0         529

Cause

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