docs: add tidb_enable_amend_pessimistic_txn depreciation (#11585)

pingcap · Dec 13, 2022 · b5d9b2d · b5d9b2d
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diff --git a/TOC-tidb-cloud.md b/TOC-tidb-cloud.md
@@ -416,6 +416,7 @@
         - [`TIKV_STORE_STATUS`](/information-schema/information-schema-tikv-store-status.md)
         - [`USER_PRIVILEGES`](/information-schema/information-schema-user-privileges.md)
         - [`VIEWS`](/information-schema/information-schema-views.md)
+    - [Metadata Lock](/metadata-lock.md)
   - [System Variables](/system-variables.md)
   - Storage Engines
     - TiKV

diff --git a/system-variables.md b/system-variables.md
@@ -1243,6 +1243,10 @@ MPP is a distributed computing framework provided by the TiFlash engine, which a
 
 ### tidb_enable_amend_pessimistic_txn <span class="version-mark">New in v4.0.7</span>
 
+> **Warning:**
+>
+> Starting from v6.6.0, this variable will be deprecated, and TiDB will use the [Metadata Lock](/metadata-lock.md) feature by default to avoid the `Information schema is changed` error.
+
 - Scope: SESSION | GLOBAL
 - Persists to cluster: Yes
 - Type: Boolean