RE: different plan with insert/select
Date: Wed, 24 Jun 2020 11:18:27 +0000
Message-ID: <28932_1592997526_5EF33696_28932_5751_1_b2480c2b33744c72b8acd3a22d3bef5a_at_vontobel.com>
- The source of VW_LAT are outer joins. It is an ANSI query, but without any explicit lateral references.
- Bypassed unnestings and/or lateral view decorrelations might explain less join permutations. I’ll examine the optimizer trace.
- Select plan runs in 10s, insert/select is running for hours.
- In a couple of hours I’ll be able to compare the result sets.
- You mean this: Plan Regression with VW_DCL (Lateral View Decorrelation) in Explain Plan New Transformation in 12c Optimizer (Doc ID 2361393.1) ? The optimizer indeed comes up with the poor plan for the select with "_optimizer_ansi_rearchitecture" = false; I'd say, DCL is done for select, but apparently has some limitations with CTAS/INS. Rewriting the query to the Oracle syntax might be a workaround.
Best regards,
Nenad
http://nenadnoveljic.com/blog/
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-- http://www.freelists.org/webpage/oracle-lReceived on Wed Jun 24 2020 - 13:18:27 CEST