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Support Article

SQLGeneratorOracle puts excessive load on DB on Oracle 12.1.0.2

SA-75353

Summary



When an SQL is generated in the SQLGeneratorOracle.getQueryForForeignKeyDependencies method, the system performance degrades.

Below is the generated SQL:


WITH given_table AS (SELECT ? AS schema_name, ? AS table_name FROM dual)
SELECT c.r_owner, c_pk.table_name
FROM given_table, all_cons_columns a
JOIN all_constraints c ON a.owner = c.owner AND a.constraint_name = c.constraint_name
JOIN all_constraints c_pk ON c.r_owner = c_pk.owner AND c.r_constraint_name = c_pk.constraint_name
WHERE c.constraint_type = 'R'
AND a.owner = given_table.schema_name
AND a.table_name = given_table.table_name
UNION
SELECT a.owner, a.table_name
FROM given_table, all_cons_columns a
JOIN all_constraints c ON a.owner = c.owner AND a.constraint_name = c.constraint_name
JOIN all_constraints c_pk ON c.r_owner = c_pk.owner AND c.r_constraint_name = c_pk.constraint_name
WHERE c.constraint_type = 'R'
AND c.r_owner = given_table.schema_name
AND c_pk.table_name = given_table.table_name



Error Messages



Not Applicable


Steps to Reproduce



Perform any action that fetches the structure of the database table.


Root Cause



This issue was related to a change in behavior in Oracle 12.1.0.2, which queried for ALL_CONSTRAINTS (Oracle DOC_ID 2266016.1).


Resolution



Apply HFix-51179..

 

Published August 15, 2019 - Updated December 2, 2021

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