Implement V$SQL_PLAN/DBA_HIST_SQL_PLAN analysis for missing index detection

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The checkForMissingIndexes method was disabled due to fundamentally incorrect SQL logic (wrong joins, no time filters, improper aggregation). Reimplemented using proper Oracle execution plan analysis.

Changes

Core Implementation

• Query V$SQL_PLAN for current full table scans with filter predicates
• Fallback to DBA_HIST_SQL_PLAN for historical AWR data (7-day window)
• Join with USER_IND_COLUMNS to exclude already-indexed columns
• Filter by MIN_ACCESS_COUNT threshold and aggregate by sql_id/object_name

New Helper Methods

• extractColumnsFromFilterPredicates() - Parses Oracle's quoted column format from predicates
• isColumnIndexed() - Validates column index status before recommending
• calculateMissingIndexUtility() - Log-scaled utility score based on execution count × elapsed time

Metrics

• oracle.index.missing_index_candidate (table, columns tags)
• oracle.index.full_table_scan_executions (table tag)

Example Output

When a missing index candidate is detected:

Missing index candidate: ORDERS on columns STATUS, CREATED_DATE (executions: 1000, utility: 65.2%)

Persisted to audit_index_analysis with action ADD and suggested index DDL in rationale.

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• www.example.com
  • Triggering command: /opt/oracle/product/23ai/dbhomeFree/bin/oracle oracleFREE (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq))) (dns block)

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Original prompt

Work on TODO: Reimplement with proper SQL using V$SQL_PLAN/DBA_HIST_SQL_PLAN analysis (from src/main/java/com/rcs/ssf/metrics/IndexEffectivenessAnalyzer.java)

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Project	Deployment	Preview	Comments	Updated (UTC)
spring-graphql	Ready	Preview	Comment	Nov 27, 2025 4:35pm