# DB Performance

> Производительность БД и запросов 1С. Используй когда нужно диагностировать slow query, SQL/DBMS trace, индексы, блокировки, deadlock, TEMPDB/WAL, размеры таблиц или СКД на больших данных.

- Skill: `ingvarconsulting/db-performance` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ingvarconsulting/db-performance`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ingvarconsulting/db-performance/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- Author: IngvarConsulting (https://skillmd.com/u/ingvarconsulting)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/ingvarconsulting/db-performance

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# DB Performance

## MCP routing

- Preferred path: use MCP `unica` tools `unica.view {}`, `unica.search`, `unica.view` on the object node, `unica.view` on the schema node, `unica.check`, `unica.docs`, and `unica.run`.
- Runtime идёт через `unica.run`: вызов без `op` отдаёт словарь операций и
контракт каждой — `argsSchema`, `execution`, `previewRequired`,
`ifRevRequiredOnApply`. Контракт вызова бери оттуда, а не из этого текста;
выбирай только операцию с `implemented: true` и не выдумывай аргументов
записи с `argsSchema: null`; превью исполнением не является. Не обходи
контракт прямым runner-ом.
- Use `unica.view` on the role node when performance behavior depends on rights filters, RLS, or tenant boundaries.
- Do not call internal analyzer, runtime, standards, or package adapters directly. They are hidden behind MCP `unica`.

## References

- Read `../../references/platform/db-performance.md` for DB-aware workflow, indexes, virtual tables, locks, and DBMS evidence.
- Read `../../references/platform/runtime-diagnostics.md` when performance evidence comes from ЖР/ТЖ, process ids, sessions, or runtime timeline.
- Read `../../references/platform/transactions-locks.md` once evidence points at contention; this skill keeps the evidence side, that document owns the lock and transaction rules.

## Workflow

1. Name the slow scenario first: user action, API call, report, background job, exchange step, or posting.
2. Extract exact query/DCS text with `unica.search` or `unica.view` on the schema node; inspect large candidate modules with `unica.view` on the module node (its `Method` branch lists the methods) before reading full bodies.
3. Find callers with `unica.search` by the method name when the performance issue depends on execution path, query-in-loop risk, or impact of moving logic; a call graph is not on the v0.13 surface.
4. Inspect `unica.view` on the object node for both the local object structure and related modules, roles, subscriptions, functional options, or predefined items that can change the performance path.
5. Gather evidence: row counts, generated SQL, query plan, managed locks, lock order, lock/deadlock participants, long transaction boundaries, temp storage, TEMPDB or WAL pressure, and table/index names.
6. Separate causes: inefficient platform query, missing or harmful index, broad virtual table read, query-in-loop, lock contention, DBMS maintenance, or data growth.
7. Propose one measurable change at a time; check syntax with `unica.check` (test runs are outside the v0.13 surface), and require separate runtime plus timing/DBMS evidence before calling the change verified.

## Stop rules

- Do not recommend indexes without a concrete predicate, join, sort, grouping, and write-cost tradeoff.
- Do not remove rights filters, tenant filters, or `РАЗРЕШЕННЫЕ` for performance without a named security decision.
- Do not claim a DBMS root cause without DBMS evidence. State missing evidence or Unica MCP contract gap.

## Output

- Scenario and evidence summary.
- Root cause ranked by likelihood.
- Minimal query/metadata/code change.
- Verification command or measurement.
- Residual risk for data volume, locks, or DBMS-specific behavior.