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Home/Questions/SQL/Describe how metadata is stored and accessed for internal tables in a relational database.

Describe how metadata is stored and accessed for internal tables in a relational database.

SQLhard0.4 min read

Reviewed by Aditya Kumar · Last reviewed 2026-03-24

**Architectural Logic**: Metadata drives optimization and discovery; system catalogs are the source of truth. **Storage**: pg_catalog (PostgreSQL), information_schema (standard). Tables: pg_class (tables, indexes), pg_attribute (columns), pg_index. **Access**: `SELECT * FROM...

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Asked at 1 company
Category
487
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Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Part of the SQL Query Optimization & Indexing Interview Preparation Hub
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Key Concepts Tested
bigqueryoptimizationsnowflakesql
Expert Answer
71 words

Architectural Logic: Metadata drives optimization and discovery; system catalogs are the source of truth. Storage: pg_catalog (PostgreSQL), information_schema (standard). Tables: pg_class (tables, indexes), pg_attribute (columns), pg_index. Access: SELECT * FROM information_schema.tables WHERE table_schema='public'. Why It Matters: Optimizer uses statistics for plans; tools use for discovery and lineage. Scalability: Maintain statistics (ANALYZE); extended properties for custom metadata. Warehouses: Snowflake (information_schema, account_usage); BigQuery (information_schema). Best practice: Use INFORMATION_SCHEMA for portability; document custom metadata.

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Pro Tip

Red Flag: Ignoring statistics—query plans degrade. Pro-Move: Mention ANALYZE strategy; using system tables for data catalog or lineage; governance integration.

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