OracleBulkCopy WritetoServer does Select * from TableName , fix it please
In Odp.Net latest version , whenever OracleBulkCopy.WritetoServer is called. It internally calls "Select * from TableName " to validate the table schema.
I did some debugging and found that this is called in function GetMetaData() in OracleBulkCopy class .
Please fix this issue by appending where 1=0 in the select clause so that it does not do a full table scan for every bulk copy insert.
The whole advantage of OracleBulkcopy performance improvement is lost because of this line.
When the Destination Table has < 1 lakh records this is not a big issue, but it degrades very badly when the destination table name has million records .
Please release a patch as soon as possible.
yes 100% sure, we even captured the trace logs from the Oracle Db end and we saw that "Select * from Tablename" was executed. See the trace below.
To elaborate on it, I am a .Net Consultant, i even went into the Odp.Net dll code and verified that GetMetaData function is called when WritetoServer is called on a new OracleBulkCopyInstance.
trace below
SQL ID: 46dym63c8qhxd
Plan Hash: 0
select *
from
TABLEX
call count cpu elapsed disk query current rows
Parse 1 0.01 0.01 0 60 0 0
Execute 0 0.00 0.00 0 0 0 0
Fetch 0 0.00 0.00 0 0 0 0
total 1 0.01 0.01 0 60 0 0
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 94
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 1 0.00 0.00
SQL*Net message from client 1 0.00 0.00
SQL ID: 5s2vzq2q78n3w
Plan Hash: 0
LOCK TABLE "SCHEMAX"."TABLEX" IN ROW EXCLUSIVE MODE NOWAIT
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.00 0.00 0 0 0 0
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 94 (recursive depth: 1)
SQL ID: dbxwyh9wxp32b
Plan Hash: 0
LOCK TABLE "SCHEMAX"."TABLEX" PARTITION ("P3") IN EXCLUSIVE MODE
NOWAIT
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.00 0.00 0 0 0 0
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 94 (recursive depth: 1)
SQL ID: 9y27jut66ajz5
Plan Hash: 0
INSERT /*+ SYS_DL_CURSOR */ INTO "SCHEMAX"."TABLEX" PARTITION ("P3")
("PARTITION_ID","GID","SEGMENT_ID","RID","STATUS",
"VERIFIC","FILE_ID","RECORD_ID","SUB_REC_ID",
"S_ID2","FILLER1","FILLER2","FILLER3","FILLER4","FILLER5",
"FILLER6","FILLER7","FILLER8","FILLER9","FILLER10","FILLER11","FILLER12",
"FILLER13","FILLER14","FILLER15","FILLER16","FILLER17","FILLER18",
"FILLER19","FILLER20","FILLER21","FILLER22","FILLER23","FILLER24",
"FILLER25","FILLER26","FILLER27","FILLER28","FILLER29","FILLER30",
"ID_BODY","CODE","EXP_DATE","SUB_RECORD_3","OCCUR",
"PARENT","SEGMENT","ID_VALUE","IS_ID")
VALUES
(NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
NULL,NULL,NULL,NULL)
Edited by: Y2KPRABU on Jul 16, 2012 11:38 PM
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