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3728542 - SAP IQ - long running "delete" statement caused high temp dbspace usage

Symptom

  • A DELETE query executed in the Sybase IQ database runs for an extended duration and consumes a very high amount of TEMP DBSPACE.
  • TEMP DBSPACE utilization increases significantly, impacting other queries and scheduled reporting jobs.
  • The DELETE query involves two tables, with the following query structure:

```

DELETE FROM "owner"."tab_A" AS A

FROM "owner"."tab_B" AS B

WHERE A.COL1= B.COL1

AND A.COL2 = B.COL2;

```


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Environment

SAP IQ 16.1

Product

SAP IQ 16.0 ; SAP IQ 16.1 ; SAP IQ 16.2

Keywords

sybase iq, delete query, temp dbspace, long-running query, query optimization, many-to-many join, cartesian product, database performance, query plan, indexing , KBA , BC-SYB-IQ , Sybase IQ , How To

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