PostgreSQL_get_cache_hit_ratio
Get cache hit ratios for tables and indexes.
This record as markdown: /tools/mukul975-postgres-mcp-server/postgresql-get-cache-hit-ratio.md
What PostgreSQL_get_cache_hit_ratio does on Postgres
AI agents call PostgreSQL_get_cache_hit_ratio to retrieve information from Postgres without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why PostgreSQL_get_cache_hit_ratio is rated Low
This tool queries PostgreSQL cache statistics to return cache hit ratio metrics. It is a read-only diagnostic operation that retrieves existing performance data without creating, modifying, deleting, or executing any changes to the database. The blast radius of misuse is minimal as it cannot alter data or trigger unintended operations.
From the tool's definition Tool name includes 'get' and description states 'Get cache hit ratios' — purely retrieves performance metrics with no modification or side effects.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_get_cache_hit_ratio safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Postgres, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For PostgreSQL_get_cache_hit_ratio, this is the rule to start with:
PostgreSQL_get_cache_hit_ratio is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Postgres, apply this rule, and every PostgreSQL_get_cache_hit_ratio call is checked against it from then on.
Questions about PostgreSQL_get_cache_hit_ratio
Get cache hit ratios for tables and indexes. It is categorised as a Read tool in the Postgres MCP Server, which means it retrieves data without modifying state.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_get_cache_hit_ratio: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Postgres. Nothing to install.
PostgreSQL_get_cache_hit_ratio is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the PostgreSQL_get_cache_hit_ratio rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for PostgreSQL_get_cache_hit_ratio. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
PostgreSQL_get_cache_hit_ratio is provided by the Postgres MCP server (mukul975/postgres-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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