Insert select statement or insert in cursor

hi all,
i need a performance compare for: insert operation in cursor one by one and select statement insert,
for example:
1. insert into TableA (ColumA,ColumnB) select A, B from TableB;
2. cursor my_cur is select A, B from TableB
for my_rec in my_cur loop
insert into TableA (ColumA,ColumnB) values (my_rec.A, my_rec.B);
end loop;
also "bulk collect into" can be used.
Which one has a better performance?
Thanks for your help,
kadriye

What's stopping you from making 100,000 rows of test data and trying it for yourself?
Edit: I was bored enough to do it myself.
Starting insert as select 22-JUL-08 11.43.19.544000000 +01:00
finished insert as select. 22-JUL-08 11.43.19.825000000 +01:00
starting cursor loop 22-JUL-08 11.43.21.497000000 +01:00
finished cursor loop 22-JUL-08 11.43.35.185000000 +01:00
The two second gap between the two is for the delete.
Message was edited by:
Dave Hemming

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Sybase version: Adaptive Server Enterprise/12.5.4/EBF 15432 ESD#8/P/Sun_svr4/OS 5.8/ase1254/2105/64-bit/FBO/Sat Mar 22 14:38:37 2008
Hi guyz,
I have a question about the performance of a statement that is very slow and I'd like to have you input.
I have the SQL statement below that is taking ages to execute and I can't find out how to imporve it
insert SST_TMP_M_TYPE select M_TYPE from MKT_OP_DBF M join TRN_HDR_DBF T on M.M_ORIGIN_NB=T.M_NB where T.M_LTI_NB=@Nson_lti
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M.M_ORIGIN_NB=T.M_NB have the same datatype
TRN_HDR_DBF has 1424951 rows and indexes on M_LTI_NB and M_NB
table MKT_OP_DBF has 870305 rows
table MKT_OP_DBF has an index on M_ORIGIN_NB column
Statistics for index:                   "MKT_OP_ND7" (nonclustered)
Index column list:                      "M_ORIGIN_NB"
     Leaf count:                        3087
     Empty leaf page count:             0
     Data page CR count:                410256.0000000000000000
     Index page CR count:               566.0000000000000000
     Data row CR count:                 467979.0000000000000000
     First extent leaf pages:           0
     Leaf row size:                     12.1161512343373872
     Index height:                      2
The representaion of M_ORIGIN_NB is
Statistics for column:                  "M_ORIGIN_NB"
Last update of column statistics:       Mar 9 2015 10:48:57:420AM
     Range cell density:                0.0000034460903826
     Total density:                     0.0053334921767125
     Range selectivity:                 default used (0.33)
     In between selectivity:            default used (0.25)
Histogram for column:                   "M_ORIGIN_NB"
Column datatype:                        numeric(10,0)
Requested step count:                   20
Actual step count:                      20
     Step     Weight                    Value
        1     0.00000000        <       0
        2     0.07300889        =       0
        3     0.05263098       <=       5025190
        4     0.05263098       <=       9202496
        5     0.05263098       <=       12664456
        6     0.05263098       <=       13129478
        7     0.05263098       <=       13698564
        8     0.05263098       <=       14735554
        9     0.05263098       <=       15168461
       10     0.05263098       <=       15562067
       11     0.05263098       <=       16452862
       12     0.05263098       <=       16909265
       13     0.05263212       <=       17251573
       14     0.05263098       <=       18009609
       15     0.05263098       <=       18207523
       16     0.05263098       <=       18404113
       17     0.05263098       <=       18588398
       18     0.05263098       <=       18793585
       19     0.05263098       <=       18998992
       20     0.03226340       <=       19574408
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QUERY PLAN FOR STATEMENT 16 (at line 35).
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        The type of query is INSERT.
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        With LRU Buffer Replacement Strategy for data pages.
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            TRN_HDR_DBF
            T
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        Index : TRN_HDR_NDX_NB
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        Positioning by key.
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        Using I/O Size 4 Kbytes for index leaf pages.
        With LRU Buffer Replacement Strategy for index leaf pages.
        Using I/O Size 4 Kbytes for data pages.
        With LRU Buffer Replacement Strategy for data pages.
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I was expecting the query to use the index also on MKT_OP_DBF
Thanks for your advices
Simon

The total density number for the MKT_OP_DBF.M_ORIGIN_NB column don't look very good:
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     Total density:                0.0053334921767125
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=====================
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from   MKT_OP_DBF
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=====================
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From your description it sounds like you've got the necessary indexes to support a TRN_HDR_DBF --> MKT_OP_DBF join order. (Though it wouldn't hurt to see the complete output from sp_helpindex for both tables just to make sure we're on the same sheet of music.)
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=====================
exec sp_modifystats MKT_OP_DBF, M_ORIGIN_NB, REMOVE_SKEW_FROM_DENSITY
go
exec sp_recompile MKT_OP_DBF
go
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=====================
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Hi,
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Select
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>
By default, Oracle Database permits concurrently running transactions to modify, add, or delete rows in the same table, and in the same data block. Changes made by one transaction are not seen by another concurrent transaction until the transaction that made the changes commits.
>
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