docs: support logging session connect attrs to slow query log #21468
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ti-chi-bot[bot] merged 12 commits intopingcap:masterfrom Mar 30, 2026
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docs: support logging session connect attrs to slow query log #21468ti-chi-bot[bot] merged 12 commits intopingcap:masterfrom
ti-chi-bot[bot] merged 12 commits intopingcap:masterfrom
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Synced from: pingcap/docs#22547 Target PR: pingcap#21468 AI Provider: gemini Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
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…com/hfxsd/docs-cn into codex/docs-sync-tidb-pr-66617-22547
Add documentation about the maximum size and truncation behavior for session connection attributes. Introduces a “大小限制与截断” section in performance-schema session connect attrs doc describing the global variable performance_schema_session_connect_attrs_size (default 4096, range [-1,65536], -1 treated as 65536, 0 disables recording), how excess bytes are truncated with a `_truncated` marker, and that accepted attributes are written to slow logs and queryable via INFORMATION_SCHEMA. Also update system-variables.md with a Chinese-localized entry for performance_schema_session_connect_attrs_size and translate the note about the 1 MiB hard handshake limit that rejects oversized connections.
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First-time contributors' checklist
What is changed, added or deleted? (Required)
This PR updates docs according to pingcap/tidb#66617:
Session_connect_attrs(json) to the schema examples ofINFORMATION_SCHEMA.SLOW_QUERYandINFORMATION_SCHEMA.CLUSTER_SLOW_QUERY.performance_schema_session_connect_attrs_size(default/range/-1behavior/truncation/1 MiB hard limit note).Performance_schema_session_connect_attrs_longest_seenPerformance_schema_session_connect_attrs_lostSESSION_CONNECT_ATTRSdoc with size limit and truncation behavior.Which TiDB version(s) do your changes apply to? (Required)
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