diff --git a/src/applications/config/check/PhabricatorDatabaseSetupCheck.php b/src/applications/config/check/PhabricatorDatabaseSetupCheck.php
--- a/src/applications/config/check/PhabricatorDatabaseSetupCheck.php
+++ b/src/applications/config/check/PhabricatorDatabaseSetupCheck.php
@@ -173,7 +173,7 @@
     }
 
     // NOTE: It's possible that replication is broken but we have not been
-    // granted permission to "SHOW SLAVE STATUS" so we can't figure it out.
+    // granted permission to "SHOW REPLICA STATUS" so we can't figure it out.
     // We allow this kind of configuration and survive these checks, trusting
     // that operations knows what they're doing. This issue is shown on the
     // "Database Servers" console.
diff --git a/src/docs/user/cluster/cluster_databases.diviner b/src/docs/user/cluster/cluster_databases.diviner
--- a/src/docs/user/cluster/cluster_databases.diviner
+++ b/src/docs/user/cluster/cluster_databases.diviner
@@ -143,7 +143,7 @@
 
 To report this status, the user Phorge is connecting as must have the
 `REPLICATION CLIENT` privilege (or the `SUPER` privilege) so it can run the
-`SHOW SLAVE STATUS` command. The `REPLICATION CLIENT` privilege only enables
+`SHOW REPLICA STATUS` command. The `REPLICATION CLIENT` privilege only enables
 the user to run diagnostic commands so it should be reasonable to grant it in
 most cases, but it is not required. If you choose not to grant it, this page
 can not show any useful diagnostic information about replication status but
diff --git a/src/docs/user/installation_guide.diviner b/src/docs/user/installation_guide.diviner
--- a/src/docs/user/installation_guide.diviner
+++ b/src/docs/user/installation_guide.diviner
@@ -77,7 +77,7 @@
 
 You will also need:
 
-  - **MySQL**: You need MySQL. We strongly recommend MySQL 5.5 or newer.
+  - **MySQL**: You need MySQL. The required version is MySQL 8.0 or newer.
     You will need a server with multiple databases.
   - **PHP**: You need a PHP engine:
     - PHP 7 - 7.2.25 or newer.
diff --git a/src/infrastructure/cluster/PhabricatorDatabaseRef.php b/src/infrastructure/cluster/PhabricatorDatabaseRef.php
--- a/src/infrastructure/cluster/PhabricatorDatabaseRef.php
+++ b/src/infrastructure/cluster/PhabricatorDatabaseRef.php
@@ -346,13 +346,13 @@
       $t_start = microtime(true);
       $replica_status = false;
       try {
-        $replica_status = queryfx_one($conn, 'SHOW SLAVE STATUS');
+        $replica_status = queryfx_one($conn, 'SHOW REPLICA STATUS');
         $ref->setConnectionStatus(self::STATUS_OKAY);
       } catch (AphrontAccessDeniedQueryException $ex) {
         $ref->setConnectionStatus(self::STATUS_REPLICATION_CLIENT);
         $ref->setConnectionMessage(
           pht(
-            'No permission to run "SHOW SLAVE STATUS". Grant this user '.
+            'No permission to run "SHOW REPLICA STATUS". Grant this user '.
             '"REPLICATION CLIENT" permission to allow this server to '.
             'monitor replica health.'));
       } catch (AphrontInvalidCredentialsQueryException $ex) {
@@ -386,7 +386,7 @@
           $ref->setReplicaMessage(
             pht(
               'This host has a "replica" role, but is not replicating data '.
-              'from a master (no output from "SHOW SLAVE STATUS").'));
+              'from a master (no output from "SHOW REPLICA STATUS").'));
         } else {
           $ref->setReplicaStatus(self::REPLICATION_OKAY);
         }
diff --git a/src/infrastructure/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php b/src/infrastructure/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php
--- a/src/infrastructure/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php
+++ b/src/infrastructure/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php
@@ -347,7 +347,7 @@
       case 1044: // Access denied to database
       case 1142: // Access denied to table
       case 1143: // Access denied to column
-      case 1227: // Access denied (e.g., no SUPER for SHOW SLAVE STATUS).
+      case 1227: // Access denied (e.g., no SUPER for SHOW REPLICA STATUS).
 
         // See T13622. Try to help users figure out that this is a GRANT
         // problem.