Recognises an index the target engine cannot create or run
https://knobit.org/id/knobit/K-813
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| Context functions | Result evaluation |
|---|---|
| Knobit creation methods | AI generated, human edited |
| Knobit types | Skill |
| LCG purposes | Assessing the learner's knowledge or skill state |
| LCG purposes | Selecting an assessment task or learning activity |
| action verb | Recognises en |
| applies knowledge | Explains SQL dialect differences |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: Snowflake; `ix_dim_account_number_current` commented out, no `cluster_by` set, and every point lookup on `dim_account` scans it. MySQL; `relationship_manager_notes` (`TEXT`) left in an index after the generator warned Acceptable: `physical_options.snowflake: {cluster_by: [account_number]}` and the Databricks equivalent — as the sample model has them — and the notes column bounded to a `VARCHAR` in the model, or removed from the index en |
| assessment method | skill-tests task: Generated DDL review, Postgres and Snowflake (DDL review skills) en |
| conforms to profile | https://oppekava.edu.ee/a/Knobitite_kirjeldamise_ja_seostamise_reeglid#LCG-KNOBIT-0.1 |
| dcterms:identifier | K-813 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 05-ddl, row 13; this skill (08-ddl.md) en |
| expected result | The index and the engine-specific lever to use en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/08-ddl/13 |
| rdfs:label | Recognises an index the target engine cannot create or run en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Index that cannot exist, or will not run (generated DDL) en |
| skos:definition | Snowflake has no `CREATE INDEX` at all, so index definitions come out commented out and the real lever is a clustering key. MySQL cannot index a `TEXT`/`BLOB` column without a prefix length, and the script will fail at that statement. en |
| skos:prefLabel | Recognises an index the target engine cannot create or run en |
| target object | index definition en |
Used by
| includes knobit | Generates DDL per target dialect and reviews it against model, engine, data and deployment |
|---|---|
| requires knobit | Generate and review DDL |