Home » RDBMS Server » Server Utilities » SELECT on external is very slow
SELECT on external is very slow [message #592662] |
Sat, 10 August 2013 13:53 |
scottwmackey
Messages: 515 Registered: March 2005
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Senior Member |
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Hi all,
I understand that nobody can debug this from where you are, but I was wondering if anybody has seen anything like this or if they have any insights into what could be going on. I just did a 112G file migration of production data using oracle_datapump so I know this works in principle. When I tried it on my test instance I am seeing stuff like this
[oracle@aggs00.test for_test]$ ls -l aggs_day_conversion_agg_2419
-rw-r----- 1 oracle oracle 15917056 Aug 10 09:06 aggs_day_conversion_agg_2419
CREATE TABLE IMP_3251198_2419(
PARTITION_DATE DATE,
USER_ID NUMBER,
SID NUMBER,
ACCOUNT_ID NUMBER,
EX_CAMPAIGN_ID NUMBER,
EX_ADGROUP_ID NUMBER,
EX_TERM_ID NUMBER,
EX_CREATIVE_ID NUMBER,
EF_HASH_ID NUMBER,
CONVERSION_TYPE VARCHAR2(4000),
CONVERSIONS NUMBER,
LAST_UPDATE DATE)
ORGANIZATION EXTERNAL
( TYPE ORACLE_DATAPUMP
DEFAULT DIRECTORY "FOR_TEST"
ACCESS PARAMETERS (NOLOGFILE)
LOCATION("FOR_TEST":'aggs_day_conversion_agg_2419')
);
SQL> select * from IMP_3251198_2419 where rownum < 2;
PARTITION_DATE USER_ID SID ACCOUNT_ID EX_CAMPAIGN_ID EX_ADGROUP_ID EX_TERM_ID EX_CREATIVE_ID EF_HASH_ID CONVERSION_TYPE CONVERSIONS LAST_UPDATE
-------------- ---------- ---------- ---------- -------------- ------------- ---------- -------------- ---------- -------------------------------------------------------------------------------- ----------- -----------
2012-06-01 2419 3 100000762 13413968 539952308 2293111868 13153197728 2897334409 Lead 1 2012-06-06
Executed in 1800.642 seconds
Does anybody have any idea why it could be taking 1800 seconds to select one record from a not very big table? File corruption? Disc fragmentation? Oracle instance configuration? I'll take all guesses and conjectures. Could it be something that I've done wrong?
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