Cursor Versus Global Temp Table

Jan 16, 2013

We had an issue with a PL/SQL package taking hours to run as a concurrent program. Database version is 10.2.0.4.0, running on Linux x86 64-bit. A tkprof'd trace file revealed the problem SQL statement to be a cursor. This one SQL statement would run for 3+ hours. I copied the SQL statement and ran it in TOAD and it completed in seconds, returning the exact same result set. To resolve the issue in the PL/SQL package I created a global temp table and ran the exact same SQL statement as an INSERT into the global temp table.

Again, instead of hours, the SQL statement completes in seconds. If I revert the change, it goes back to taking hours. I've attached the relevant sections of the tkprof showing the two SQL statements (identical other than the insert in front of one) and the resulting explain plans and performance data. I've always been under the impression that a cursor was a better option than a temp table and I've never run into a situation where the same SQL statement runs so much longer when executed as a cursor.

Attached File(s)

SQL_As_Cursor.jpg ( 274.02K )
Number of downloads: 7

Explain_for_SQL_As_Cursor.jpg ( 189.43K )
Number of downloads: 4

SQL_as_Insert.jpg ( 277.38K )
Number of downloads: 4

Explain_for_SQL_As_Insert.jpg ( 180.66K )
Number of downloads: 2

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