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Status Functionality already exists
Workspace Db2
Components Tables/Index (Range MQ MDC etc.)
Created by Guest
Created on Jun 28, 2024

RELATED IDEAS

Add a field in MON_GET_TABLE function to check whether Restrict on drop is enabled or not for a table

Missing Restrict on Drop clause while creating table can be costly! (DB2LUW)

DB2 LUW provides a clause called "Restrict on drop". This clause should be used while creating a table. With Alter statement it can be disabled too.

Why missing this clause while creating table can be costly?
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Two scenarios let we discuss with this :

Scenario1 : Using with clause while creating table
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If we use this clause while creation of the table , then it gets protected while dropping. We cannot drop this table until or unless this clause is disabled!.

Scenario 2: Missing this clause while creating table
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If we miss this clause while creating a table, then the table gets dropped. This can be very costly because

- Table gets dropped
- All the dependencies become inoperative
-The referential constraints get dropped
-Also at last dropped table must be recovered.

Needed By Not sure -- Just thought it was cool
  • Admin
    Bryan Tang
    Reply
    |     Jul 11, 2024

    MON_GET_TABLE is designed for monitoring, and thus dumps very few properties of the actual table.

    The system catalogs contain this information, as documented here: https://www.ibm.com/docs/en/db2/11.5?topic=views-syscattables

    The following query will interrogate the system catalogs to determine if RESTRICT_ON_DROP is set for tables in the DB2INST1 schema:

    db2> SELECT SUBSTR(TABNAME,1,16) AS TABNAME, DROPRULE FROM SYSCAT.TABLES WHERE TABSCHEMA='DB2INST1'

    TABNAME DROPRULE

    ---------------- --------

    T1 N

    T2 R

    2 record(s) selected.

  • Guest
    Reply
    |     Jul 3, 2024

    That would be good to protect business-critical tables. It wouldn't be the first time one such tables be dropped by mistake.

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