diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1349,6 +1349,7 @@
     'PhabricatorConfigIssueViewController' => 'applications/config/controller/PhabricatorConfigIssueViewController.php',
     'PhabricatorConfigJSON' => 'applications/config/json/PhabricatorConfigJSON.php',
     'PhabricatorConfigJSONOptionType' => 'applications/config/custom/PhabricatorConfigJSONOptionType.php',
+    'PhabricatorConfigKeySchema' => 'applications/config/schema/PhabricatorConfigKeySchema.php',
     'PhabricatorConfigListController' => 'applications/config/controller/PhabricatorConfigListController.php',
     'PhabricatorConfigLocalSource' => 'infrastructure/env/PhabricatorConfigLocalSource.php',
     'PhabricatorConfigManagementDeleteWorkflow' => 'applications/config/management/PhabricatorConfigManagementDeleteWorkflow.php',
@@ -4242,6 +4243,7 @@
     'PhabricatorConfigIssueListController' => 'PhabricatorConfigController',
     'PhabricatorConfigIssueViewController' => 'PhabricatorConfigController',
     'PhabricatorConfigJSONOptionType' => 'PhabricatorConfigOptionType',
+    'PhabricatorConfigKeySchema' => 'PhabricatorConfigStorageSchema',
     'PhabricatorConfigListController' => 'PhabricatorConfigController',
     'PhabricatorConfigLocalSource' => 'PhabricatorConfigProxySource',
     'PhabricatorConfigManagementDeleteWorkflow' => 'PhabricatorConfigManagementWorkflow',
diff --git a/src/applications/config/application/PhabricatorConfigApplication.php b/src/applications/config/application/PhabricatorConfigApplication.php
--- a/src/applications/config/application/PhabricatorConfigApplication.php
+++ b/src/applications/config/application/PhabricatorConfigApplication.php
@@ -45,7 +45,7 @@
         'database/'.
           '(?:(?P<database>[^/]+)/'.
           '(?:(?P<table>[^/]+)/'.
-          '(?:(?P<column>[^/]+)/)?)?)?'
+          '(?:(?:col/(?P<column>[^/]+)|key/(?P<key>[^/]+))/)?)?)?'
           => 'PhabricatorConfigDatabaseController',
         '(?P<verb>ignore|unignore)/(?P<key>[^/]+)/'
           => 'PhabricatorConfigIgnoreController',
diff --git a/src/applications/config/controller/PhabricatorConfigDatabaseController.php b/src/applications/config/controller/PhabricatorConfigDatabaseController.php
--- a/src/applications/config/controller/PhabricatorConfigDatabaseController.php
+++ b/src/applications/config/controller/PhabricatorConfigDatabaseController.php
@@ -3,14 +3,18 @@
 final class PhabricatorConfigDatabaseController
   extends PhabricatorConfigController {
 
+  const MAX_INNODB_KEY_LENGTH = 767;
+
   private $database;
   private $table;
   private $column;
+  private $key;
 
   public function willProcessRequest(array $data) {
     $this->database = idx($data, 'database');
     $this->table = idx($data, 'table');
     $this->column = idx($data, 'column');
+    $this->key = idx($data, 'key');
   }
 
   public function processRequest() {
@@ -43,6 +47,14 @@
         $this->database,
         $this->table,
         $this->column);
+    } else if ($this->key) {
+      return $this->renderKey(
+        $comp,
+        $expect,
+        $actual,
+        $this->database,
+        $this->table,
+        $this->key);
     } else if ($this->table) {
       return $this->renderTable(
         $comp,
@@ -77,12 +89,16 @@
         $crumbs->addTextCrumb(
           $this->database,
           $this->getApplicationURI('database/'.$this->database.'/'));
-        if ($this->column) {
+        if ($this->column || $this->key) {
           $crumbs->addTextCrumb(
             $this->table,
             $this->getApplicationURI(
               'database/'.$this->database.'/'.$this->table.'/'));
-          $crumbs->addTextCrumb($this->column);
+          if ($this->column) {
+            $crumbs->addTextCrumb($this->column);
+          } else {
+            $crumbs->addTextCrumb($this->key);
+          }
         } else {
           $crumbs->addTextCrumb($this->table);
         }
@@ -276,6 +292,7 @@
     $type_issue = PhabricatorConfigStorageSchema::ISSUE_COLUMNTYPE;
     $charset_issue = PhabricatorConfigStorageSchema::ISSUE_CHARSET;
     $collation_issue = PhabricatorConfigStorageSchema::ISSUE_COLLATION;
+    $nullable_issue = PhabricatorConfigStorageSchema::ISSUE_NULLABLE;
 
     $database = $comp->getDatabase($database_name);
     if (!$database) {
@@ -322,6 +339,7 @@
               'database/'.
               $database_name.'/'.
               $table_name.'/'.
+              'col/'.
               $column_name.'/'),
           ),
           $column_name),
@@ -330,6 +348,11 @@
           $column->getColumnType(),
           $column->hasIssue($type_issue)),
         $this->renderAttr(
+          $column->getNullable()
+            ? pht('Yes')
+            : pht('No'),
+          $column->hasIssue($nullable_issue)),
+        $this->renderAttr(
           $column->getCharacterSet(),
           $column->hasIssue($charset_issue)),
         $this->renderAttr(
@@ -342,9 +365,10 @@
       ->setHeaders(
         array(
           null,
-          pht('Table'),
+          pht('Column'),
           pht('Data Type'),
           pht('Column Type'),
+          pht('Nullable'),
           pht('Character Set'),
           pht('Collation'),
         ))
@@ -358,6 +382,66 @@
           null
         ));
 
+    $key_rows = array();
+    foreach ($table->getKeys() as $key_name => $key) {
+      $expect_key = null;
+      if ($expect_table) {
+        $expect_key = $expect_table->getKey($key_name);
+      }
+
+      $status = $key->getStatus();
+
+      $size = 0;
+      foreach ($key->getColumnNames() as $column_name) {
+        $column = $table->getColumn($column_name);
+        if (!$column) {
+          $size = 0;
+          break;
+        }
+        $size += $column->getKeyByteLength();
+      }
+
+      $size_formatted = null;
+      if ($size) {
+        $size_formatted = $this->renderAttr(
+          $size,
+          ($size > self::MAX_INNODB_KEY_LENGTH));
+      }
+
+      $key_rows[] = array(
+        $this->renderIcon($status),
+        phutil_tag(
+          'a',
+          array(
+            'href' => $this->getApplicationURI(
+              'database/'.
+              $database_name.'/'.
+              $table_name.'/'.
+              'key/'.
+              $key_name.'/'),
+          ),
+          $key_name),
+        implode(', ', $key->getColumnNames()),
+        $size_formatted,
+      );
+    }
+
+    $keys_view = id(new AphrontTableView($key_rows))
+      ->setHeaders(
+        array(
+          null,
+          pht('Key'),
+          pht('Columns'),
+          pht('Size'),
+        ))
+      ->setColumnClasses(
+        array(
+          null,
+          'wide pri',
+          null,
+          null,
+        ));
+
     $title = pht('Database Status: %s.%s', $database_name, $table_name);
 
     if ($actual_table) {
@@ -388,7 +472,8 @@
     $box = id(new PHUIObjectBoxView())
       ->setHeaderText($title)
       ->addPropertyList($properties)
-      ->appendChild($table_view);
+      ->appendChild($table_view)
+      ->appendChild($keys_view);
 
     return $this->buildResponse($title, $box);
   }
@@ -412,7 +497,7 @@
     }
 
     $column = $table->getColumn($column_name);
-    if (!$table) {
+    if (!$column) {
       return new Aphront404Response();
     }
 
@@ -504,6 +589,88 @@
 
     return $this->buildResponse($title, $box);
   }
+
+  private function renderKey(
+    PhabricatorConfigServerSchema $comp,
+    PhabricatorConfigServerSchema $expect,
+    PhabricatorConfigServerSchema $actual,
+    $database_name,
+    $table_name,
+    $key_name) {
+
+    $database = $comp->getDatabase($database_name);
+    if (!$database) {
+      return new Aphront404Response();
+    }
+
+    $table = $database->getTable($table_name);
+    if (!$table) {
+      return new Aphront404Response();
+    }
+
+    $key = $table->getKey($key_name);
+    if (!$key) {
+      return new Aphront404Response();
+    }
+
+    $actual_database = $actual->getDatabase($database_name);
+    $actual_table = null;
+    $actual_key = null;
+    if ($actual_database) {
+      $actual_table = $actual_database->getTable($table_name);
+      if ($actual_table) {
+        $actual_key = $actual_table->getKey($key_name);
+      }
+    }
+
+    $expect_database = $expect->getDatabase($database_name);
+    $expect_table = null;
+    $expect_key = null;
+    if ($expect_database) {
+      $expect_table = $expect_database->getTable($table_name);
+      if ($expect_table) {
+        $expect_key = $expect_table->getKey($key_name);
+      }
+    }
+
+    if ($actual_key) {
+      $actual_columns = $actual_key->getColumnNames();
+    } else {
+      $actual_columns = array();
+    }
+
+    if ($expect_key) {
+      $expect_columns = $expect_key->getColumnNames();
+    } else {
+      $expect_columns = array();
+    }
+
+    $title = pht(
+      'Database Status: %s.%s (%s)',
+      $database_name,
+      $table_name,
+      $key_name);
+
+    $properties = $this->buildProperties(
+      array(
+        array(
+          pht('Columns'),
+          implode(', ', $actual_columns),
+        ),
+        array(
+          pht('Expected Columns'),
+          implode(', ', $expect_columns),
+        ),
+      ),
+      $key->getIssues());
+
+    $box = id(new PHUIObjectBoxView())
+      ->setHeaderText($title)
+      ->addPropertyList($properties);
+
+    return $this->buildResponse($title, $box);
+  }
+
   private function renderIcon($status) {
     switch ($status) {
       case PhabricatorConfigStorageSchema::STATUS_OKAY:
diff --git a/src/applications/config/schema/PhabricatorConfigColumnSchema.php b/src/applications/config/schema/PhabricatorConfigColumnSchema.php
--- a/src/applications/config/schema/PhabricatorConfigColumnSchema.php
+++ b/src/applications/config/schema/PhabricatorConfigColumnSchema.php
@@ -7,6 +7,16 @@
   private $collation;
   private $columnType;
   private $dataType;
+  private $nullable;
+
+  public function setNullable($nullable) {
+    $this->nullable = $nullable;
+    return $this;
+  }
+
+  public function getNullable() {
+    return $this->nullable;
+  }
 
   public function setColumnType($column_type) {
     $this->columnType = $column_type;
@@ -48,6 +58,20 @@
     return $this->characterSet;
   }
 
+  public function getKeyByteLength() {
+    $type = $this->getColumnType();
+
+    $matches = null;
+    if (preg_match('/^varchar\((\d+)\)$/', $type, $matches)) {
+      // For utf8mb4, each character requires 4 bytes.
+      return ((int)$matches[1]) * 4;
+    }
+
+    // TODO: Build this out to catch overlong indexes.
+
+    return 0;
+  }
+
   public function compareToSimilarSchema(
     PhabricatorConfigStorageSchema $expect) {
 
diff --git a/src/applications/config/schema/PhabricatorConfigKeySchema.php b/src/applications/config/schema/PhabricatorConfigKeySchema.php
new file mode 100644
--- /dev/null
+++ b/src/applications/config/schema/PhabricatorConfigKeySchema.php
@@ -0,0 +1,37 @@
+<?php
+
+final class PhabricatorConfigKeySchema
+  extends PhabricatorConfigStorageSchema {
+
+  private $columnNames;
+
+  public function setColumnNames(array $column_names) {
+    $this->columnNames = $column_names;
+    return $this;
+  }
+
+  public function getColumnNames() {
+    return $this->columnNames;
+  }
+
+  protected function getSubschemata() {
+    return array();
+  }
+
+  public function compareToSimilarSchema(
+    PhabricatorConfigStorageSchema $expect) {
+
+    $issues = array();
+    if ($this->getColumnNames() !== $expect->getColumnNames()) {
+      $issues[] = self::ISSUE_KEYCOLUMNS;
+    }
+
+    return $issues;
+  }
+
+  public function newEmptyClone() {
+    $clone = clone $this;
+    return $clone;
+  }
+
+}
diff --git a/src/applications/config/schema/PhabricatorConfigSchemaQuery.php b/src/applications/config/schema/PhabricatorConfigSchemaQuery.php
--- a/src/applications/config/schema/PhabricatorConfigSchemaQuery.php
+++ b/src/applications/config/schema/PhabricatorConfigSchemaQuery.php
@@ -47,6 +47,41 @@
       $databases);
     $database_info = ipull($database_info, null, 'SCHEMA_NAME');
 
+    $sql = array();
+    foreach ($tables as $table) {
+      $sql[] = qsprintf(
+        $conn,
+        '(TABLE_SCHEMA = %s AND TABLE_NAME = %s)',
+        $table['TABLE_SCHEMA'],
+        $table['TABLE_NAME']);
+    }
+
+    if ($sql) {
+      $column_info = queryfx_all(
+        $conn,
+        'SELECT TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, CHARACTER_SET_NAME,
+            COLLATION_NAME, COLUMN_TYPE, IS_NULLABLE
+          FROM INFORMATION_SCHEMA.COLUMNS
+          WHERE (%Q)',
+        '('.implode(') OR (', $sql).')');
+      $column_info = igroup($column_info, 'TABLE_SCHEMA');
+    } else {
+      $column_info = array();
+    }
+
+    if ($sql) {
+      $key_info = queryfx_all(
+        $conn,
+        'SELECT CONSTRAINT_NAME, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME,
+            ORDINAL_POSITION, POSITION_IN_UNIQUE_CONSTRAINT
+          FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
+          WHERE (%Q)',
+        '('.implode(') OR (', $sql).')');
+      $key_info = igroup($key_info, 'TABLE_SCHEMA');
+    } else {
+      $key_info = array();
+    }
+
     $server_schema = new PhabricatorConfigServerSchema();
 
     $tables = igroup($tables, 'TABLE_SCHEMA');
@@ -58,6 +93,11 @@
         ->setCharacterSet($info['DEFAULT_CHARACTER_SET_NAME'])
         ->setCollation($info['DEFAULT_COLLATION_NAME']);
 
+      $database_column_info = idx($column_info, $database_name, array());
+      $database_column_info = igroup($database_column_info, 'TABLE_NAME');
+      $database_key_info = idx($key_info, $database_name, array());
+      $database_key_info = igroup($database_key_info, 'TABLE_NAME');
+
       foreach ($database_tables as $table) {
         $table_name = $table['TABLE_NAME'];
 
@@ -65,24 +105,29 @@
           ->setName($table_name)
           ->setCollation($table['TABLE_COLLATION']);
 
-        $columns = queryfx_all(
-          $conn,
-          'SELECT COLUMN_NAME, CHARACTER_SET_NAME, COLLATION_NAME, COLUMN_TYPE
-            FROM INFORMATION_SCHEMA.COLUMNS
-            WHERE TABLE_SCHEMA = %s AND TABLE_NAME = %s',
-          $database_name,
-          $table_name);
-
+        $columns = idx($database_column_info, $table_name, array());
         foreach ($columns as $column) {
           $column_schema = id(new PhabricatorConfigColumnSchema())
             ->setName($column['COLUMN_NAME'])
             ->setCharacterSet($column['CHARACTER_SET_NAME'])
             ->setCollation($column['COLLATION_NAME'])
-            ->setColumnType($column['COLUMN_TYPE']);
+            ->setColumnType($column['COLUMN_TYPE'])
+            ->setNullable($column['IS_NULLABLE'] == 'YES');
 
           $table_schema->addColumn($column_schema);
         }
 
+        $key_parts = idx($database_key_info, $table_name, array());
+        $keys = igroup($key_parts, 'CONSTRAINT_NAME');
+        foreach ($keys as $key_name => $key_pieces) {
+          $key_pieces = isort($key_pieces, 'ORDINAL_POSITION');
+          $key_schema = id(new PhabricatorConfigKeySchema())
+            ->setName($key_name)
+            ->setColumnNames(ipull($key_pieces, 'COLUMN_NAME'));
+
+          $table_schema->addKey($key_schema);
+        }
+
         $database_schema->addTable($table_schema);
       }
 
@@ -190,6 +235,22 @@
 
           $comp_table->addColumn($comp_column);
         }
+
+        $all_keys =
+          $actual_table->getKeys() +
+          $expect_table->getKeys();
+        foreach ($all_keys as $key_name => $key_template) {
+          $actual_key = $actual_table->getKey($key_name);
+          $expect_key = $expect_table->getKey($key_name);
+
+          $issues = $this->compareSchemata($expect_key, $actual_key);
+
+          $comp_key = $key_template->newEmptyClone()
+            ->setIssues($issues);
+
+          $comp_table->addKey($comp_key);
+        }
+
         $comp_database->addTable($comp_table);
       }
       $comp_server->addDatabase($comp_database);
diff --git a/src/applications/config/schema/PhabricatorConfigStorageSchema.php b/src/applications/config/schema/PhabricatorConfigStorageSchema.php
--- a/src/applications/config/schema/PhabricatorConfigStorageSchema.php
+++ b/src/applications/config/schema/PhabricatorConfigStorageSchema.php
@@ -7,6 +7,8 @@
   const ISSUE_CHARSET = 'charset';
   const ISSUE_COLLATION = 'collation';
   const ISSUE_COLUMNTYPE = 'columntype';
+  const ISSUE_NULLABLE = 'nullable';
+  const ISSUE_KEYCOLUMNS = 'keycolumns';
   const ISSUE_SUBWARN = 'subwarn';
   const ISSUE_SUBFAIL = 'subfail';
 
@@ -98,6 +100,10 @@
         return pht('Wrong Collation');
       case self::ISSUE_COLUMNTYPE:
         return pht('Wrong Column Type');
+      case self::ISSUE_NULLABLE:
+        return pht('Wrong Nullable Setting');
+      case self::ISSUE_KEYCOLUMNS:
+        return pht('Key on Wrong Columns');
       case self::ISSUE_SUBWARN:
         return pht('Subschemata Have Warnings');
       case self::ISSUE_SUBFAIL:
@@ -119,6 +125,10 @@
         return pht('This schema can use a better collation.');
       case self::ISSUE_COLUMNTYPE:
         return pht('This schema can use a better column type.');
+      case self::ISSUE_NULLABLE:
+        return pht('This schema has the wrong nullable setting.');
+      case self::ISSUE_KEYCOLUMNS:
+        return pht('This schema is on the wrong columns.');
       case self::ISSUE_SUBWARN:
         return pht('Subschemata have setup warnings.');
       case self::ISSUE_SUBFAIL:
@@ -138,6 +148,7 @@
       case self::ISSUE_COLLATION:
       case self::ISSUE_COLUMNTYPE:
       case self::ISSUE_SUBWARN:
+      case self::ISSUE_KEYCOLUMNS:
         return self::STATUS_WARN;
       default:
         throw new Exception(pht('Unknown schema issue "%s"!', $issue));
diff --git a/src/applications/config/schema/PhabricatorConfigTableSchema.php b/src/applications/config/schema/PhabricatorConfigTableSchema.php
--- a/src/applications/config/schema/PhabricatorConfigTableSchema.php
+++ b/src/applications/config/schema/PhabricatorConfigTableSchema.php
@@ -5,6 +5,7 @@
 
   private $collation;
   private $columns = array();
+  private $keys = array();
 
   public function addColumn(PhabricatorConfigColumnSchema $column) {
     $key = $column->getName();
@@ -16,6 +17,16 @@
     return $this;
   }
 
+  public function addKey(PhabricatorConfigKeySchema $key) {
+    $name = $key->getName();
+    if (isset($this->keys[$name])) {
+      throw new Exception(
+        pht('Trying to add duplicate key "%s"!', $name));
+    }
+    $this->keys[$name] = $key;
+    return $this;
+  }
+
   public function getColumns() {
     return $this->columns;
   }
@@ -24,8 +35,16 @@
     return idx($this->getColumns(), $key);
   }
 
+  public function getKeys() {
+    return $this->keys;
+  }
+
+  public function getKey($key) {
+    return idx($this->getKeys(), $key);
+  }
+
   protected function getSubschemata() {
-    return $this->getColumns();
+    return array_merge($this->getColumns(), $this->getKeys());
   }
 
   public function setCollation($collation) {
@@ -51,6 +70,7 @@
   public function newEmptyClone() {
     $clone = clone $this;
     $clone->columns = array();
+    $clone->keys = array();
     return $clone;
   }