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Status Not under consideration
Workspace Db2
Components Serviceability
Created by Guest
Created on Apr 26, 2019

Add table function to "pretty print" explained statement

Db2 allows to install the EXPLAIN TABLES using a procedure (https://www.ibm.com/support/knowledgecenter/SSEPGG_11.1.0/com.ibm.db2.luw.admin.explain.doc/doc/t0059594.html)

 

There are different ways to generate an access plan, i.e., to explain a statement using SQL. One simple way is to use EXPLAIN PLAN FOR. However, it is not possible to print the generated access plan using SQL. Thus, add a table function to pretty print an access plan.

Some considerations:

  • if not specified, return the access plan for the last explained session user
  • else use the query tag or query number to identifiy the statements (see EXPLAIN PLAN FOR)
  • by default or if specified, print a compact representation of the query plan
  • if requested, print the plan with all details

The output should be in a table format (hence table function).

For some background information see this tweet:

https://twitter.com/data_henrik/status/1121318954407014400

 

The new functionality closes Db2 tooling gaps. It would allow to quickly obtain AND print access plan information in Jupyter notebooks and (IBM) Data Science tools. It would also enhance the SQL consoles in our aaS offerings.

Needed by Date May 1, 2019
  • Guest
    Jun 2, 2019

    Just for public clarity, the original response to this idea was based on a misunderstanding and is not relevant This idea is still active and open (waiting for review).

  • Guest
    May 8, 2019

    How does this already exist? The request is for a stored procedure that displays explain information

  • Guest
    May 8, 2019

    Table functions are named in EXPLAIN access plans since 11.1 fix pack 2