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BachStudio Teradata MCP Server

sql_Execute_Full_Pipeline

Executes a complete SQL query clustering workflow to identify and analyze high CPU usage queries, enabling targeted optimization of database performance.

Instructions

COMPLETE SQL QUERY CLUSTERING PIPELINE FOR HIGH-USAGE QUERY OPTIMIZATION

This tool executes the entire SQL query clustering workflow to identify and analyze high CPU usage queries for optimization opportunities. It's designed for database performance analysts and DBAs who need to systematically identify query optimization candidates.

FULL PIPELINE WORKFLOW:

  1. Query Log Extraction: Extracts SQL queries from DBC.DBQLSqlTbl with comprehensive performance metrics

  2. Performance Metrics Calculation: Computes CPU skew, I/O skew, PJI (Physical to Logical I/O ratio), UII (Unit I/O Intensity)

  3. Query Tokenization: Tokenizes SQL text using {sql_clustering_config.get('model', {}).get('model_id', 'bge-small-en-v1.5')} tokenizer via ivsm.tokenizer_encode

  4. Embedding Generation: Creates semantic embeddings using ivsm.IVSM_score with ONNX models

  5. Vector Store Creation: Converts embeddings to vector columns via ivsm.vector_to_columns

  6. K-Means Clustering: Groups similar queries using TD_KMeans with optimal K from configuration

  7. Silhouette Analysis: Calculates clustering quality scores using TD_Silhouette

  8. Statistics Generation: Creates comprehensive cluster statistics with performance aggregations

PERFORMANCE METRICS EXPLAINED:

  • AMPCPUTIME: Total CPU seconds across all AMPs (primary optimization target)

  • CPUSKW/IOSKW: CPU/I/O skew ratios (>2.0 indicates distribution problems)

  • PJI: Physical-to-Logical I/O ratio (higher = more CPU-intensive)

  • UII: Unit I/O Intensity (higher = more I/O-intensive relative to CPU)

  • LogicalIO: Total logical I/O operations (indicates scan intensity)

  • NumSteps: Query plan complexity (higher = more complex plans)

CONFIGURATION (from sql_opt_config.yml):

  • Uses top {default_max_queries} queries by CPU time (configurable)

  • Creates {default_optimal_k} clusters by default (configurable via optimal_k parameter)

  • Embedding model: {sql_clustering_config.get('model', {}).get('model_id', 'bge-small-en-v1.5')}

  • Vector dimensions: {sql_clustering_config.get('embedding', {}).get('vector_length', 384)}

  • All database and table names are configurable

OPTIMIZATION WORKFLOW: After running this tool, use:

  1. sql_Analyze_Cluster_Stats to identify problematic clusters

  2. sql_Retrieve_Cluster_Queries to get actual SQL from target clusters

  3. LLM analysis to identify patterns and propose specific optimizations

USE CASES:

  • Identify query families consuming the most system resources

  • Find queries with similar patterns but different performance

  • Discover optimization opportunities through clustering analysis

  • Prioritize DBA effort on highest-impact query improvements

  • Understand workload composition and resource distribution

PREREQUISITES:

  • DBC.DBQLSqlTbl and DBC.DBQLOgTbl must be accessible

  • Embedding models and tokenizers must be installed in feature_ext_db

  • Sufficient space in feature_ext_db for intermediate and final tables

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
optimal_kNo
max_queriesNo
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden. It comprehensively details the pipeline steps, performance metrics, and configuration, including the fact that it creates intermediate and final tables. It does not explicitly state side effects like table modification, but the workflow implies database writes.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with sections and bullet points, and it is front-loaded with a bold summary. However, it is verbose; some details could be streamlined without losing value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity of the pipeline and the absence of output schema and annotations, the description covers workflow steps, metrics, configuration, use cases, and prerequisites. However, it does not explicitly describe the return value or output format, which is a notable gap for a pipeline tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It mentions default values for max_queries and optimal_k from configuration, but does not provide a detailed explanation of each parameter's effect or allowed values. The description adds some context but is not comprehensive.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description explicitly states it executes the entire SQL query clustering pipeline for optimizing high CPU usage queries. It provides a step-by-step workflow and distinguishes itself from sibling tools like sql_Analyze_Cluster_Stats and sql_Retrieve_Cluster_Queries, which are post-pipeline steps.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Clear use cases and optimization workflow are provided, along with prerequisites. However, there is no explicit contrast with alternatives like direct SQL queries or other tools. The description implies when to use it, but lacks explicit 'when not to use' guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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