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The sqlplus feedback gives us the breakdown of the previous merge rowcount.UPDATE ( SELECT src.object_name AS src_name 2 , src.object_type AS src_type 3 , tgt.object_name AS tgt_name 4 , tgt.object_type AS tgt_type 5 FROM source_table src 6 , target_table tgt 7 WHERE src.object_id = tgt.object_id ) 8 SET tgt_name = src_name 9 , tgt_type = src_type; Run1 ran in 1239 hsecs Run2 ran in 522 hsecs Run1 ran in 237.36% of the time Name Run1 Run2 Diff STAT.buffers moved to hea 2 1,024 1,022 LATCH.simulator hash latch 5,423 7,820 2,397 LATCH.checkpoint queue latch 12,435 8,966 -3,469 STAT..session pga memory max 7,904 0 -7,904 STAT.entries 87,326 44,564 -42,762 allocation 87,793 44,871 -42,922 LATCH.cache buffers chains 580,501 499,486 -81,015 STAT.block changes 175,708 89,825 -85,883 STAT.block gets 132,934 46,622 -86,312 STAT..index fetch by key 0 86,889 86,889 STAT..table scan rows gotten 130,374 217,263 86,889 STAT..consistent gets - examin 230 87,120 86,890 STAT..buffer is not pinned cou 978 88,317 87,339 STAT.work - consistent rea 969 88,312 87,343 STAT..session logical reads 134,389 222,507 88,118 STAT..consistent gets 1,455 175,885 174,430 STAT.size 23,369,732 15,606,560 -7,763,172 Run1 latches total versus run2 -- difference and pct Run1 Run2 Diff Pct 693,976 568,252 -125,724 122.12% PL/SQL procedure successfully completed.It has been raised because Oracle found more than one target row that matched a single source row.

We will replace the two-part SQL solution with a PL/SQL loop that will attempt an update first and insert only if the update affects no rows.

We can demonstrate what happens if we cannot ensure key-preservation by modifying our MERGE to join on a column other than that of the primary key.

MERGE 2 INTO target_table tgt 3 USING source_table src 4 ON ( src.object_name = tgt.object_name ) 5 WHEN MATCHED 6 THEN 7 UPDATE 8 SET tgt.object_type = src.object_type 9 WHEN NOT MATCHED 10 THEN 11 INSERT ( tgt.object_id 12 , tgt.object_name 13 , tgt.object_type ) 14 VALUES ( src.object_id 15 , src.object_name 16 , src.object_type ); This error message is slightly confusing.

We could speed up the latter by using bulk processing, but we wouldn't be able to achieve a reduction of two-thirds required to match the MERGE. This means that for each source row, Oracle needs to be able to identify a single target record for update.

The simplest method of ensuring that the MERGE is key-preserved is to join source and target according to the primary key of the target.

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