diff -u b/core/modules/system/system.install b/core/modules/system/system.install
--- b/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -12,6 +12,7 @@
 use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Database\Database;
+use Drupal\Core\Database\DatabaseExceptionWrapper;
 use Drupal\Core\DrupalKernel;
 use Drupal\Core\Entity\ContentEntityTypeInterface;
 use Drupal\Core\Entity\EntityTypeInterface;
@@ -2522,10 +2523,10 @@
   }
 }
 
-/**
+/*
  * Fix any orphan sequences created from column changes in PostgreSQL.
  */
-function system_update_8802(&$sandbox) {
+function system_update_8806(&$sandbox) {
   $connection = \Drupal::database();
   if ($connection->databaseType() !== 'pgsql') {
     // This database update is a no-op for all other core database drivers.
@@ -2616,7 +2617,7 @@
 
               $sandbox['fixed']++;
             }
-            catch (\Drupal\Core\Database\DatabaseExceptionWrapper $e) {
+            catch (DatabaseExceptionWrapper $e) {
               $transaction->rollBack();
             }
           }
@@ -2642 +2642,0 @@
-
reverted:
--- b/core/tests/Drupal/FunctionalTests/Core/Database/PostgreSqlSequenceUpdateTest.php
+++ /dev/null
@@ -1,47 +0,0 @@
-<?php
-
-namespace Drupal\FunctionalTests\Core\Database;
-
-use Drupal\FunctionalTests\Update\UpdatePathTestBase;
-
-/**
- * Tests that any unowned sequences created previously have a table owner.
- *
- * The update path only applies to Drupal sites using the pgsql driver.
- *
- * @group database
- */
-class PostgreSqlSequenceUpdateTest extends UpdatePathTestBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setDatabaseDumpFiles() {
-    $this->databaseDumpFiles = [
-      __DIR__ . '/../../../../../modules/system/tests/fixtures/update/drupal-8.6.0.bare.testing.php.gz',
-      __DIR__ . '/../../../../../modules/system/tests/fixtures/update/drupal-8.pgsql-orphan-sequence.php',
-    ];
-  }
-
-  /**
-   * Asserts that a newly created sequence has the correct ownership.
-   */
-  public function testPostgreSqlSequenceUpdate() {
-    $database = $this->container->get('database');
-    $db_type = $database->databaseType();
-
-    // Run the updates.
-    $this->runUpdates();
-
-    if ($db_type === 'pgsql') {
-      $sequenceExists = (bool) $database
-        ->query("SELECT pg_get_serial_sequence('{" . $database->prefixTables('pgsql_sequence_test') . "}', 'sequence_field')")
-        ->fetchField();
-      $this->assertTrue($sequenceExists, 'Sequence is owned by the table and column.');
-    }
-    else {
-      $this->assertTrue(TRUE, 'Database update ran successfully on non-pgsql driver.');
-    }
-  }
-
-}
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Config/DatabaseStorage.php
+++ b/core/lib/Drupal/Core/Config/DatabaseStorage.php
@@ -84,7 +84,10 @@ public function exists($name) {
   public function read($name) {
     $data = FALSE;
     try {
-      $raw = $this->connection->query('SELECT data FROM {' . $this->connection->escapeTable($this->table) . '} WHERE collection = :collection AND name = :name', [':collection' => $this->collection, ':name' => $name], $this->options)->fetchField();
+      $raw = $this->connection->query('SELECT data FROM {' . $this->connection->escapeTable($this->table) . '} WHERE collection = :collection AND name = :name ORDER BY collection, name', [
+        ':collection' => $this->collection,
+        ':name' => $name,
+      ], $this->options)->fetchField();
       if ($raw !== FALSE) {
         $data = $this->decode($raw);
       }
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/system/tests/src/Functional/Database/PostgreSqlSequenceUpdateTest.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\Database;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+
+/**
+ * Tests that any unowned sequences created previously have a table owner.
+ *
+ * The update path only applies to Drupal sites using the pgsql driver.
+ *
+ * @group Database
+ */
+class PostgreSqlSequenceUpdateTest extends UpdatePathTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setDatabaseDumpFiles() {
+    $this->databaseDumpFiles = [
+      __DIR__ . '/../../../fixtures/update/drupal-8.6.0.bare.testing.php.gz',
+      __DIR__ . '/../../../fixtures/update/drupal-8.pgsql-orphan-sequence.php',
+    ];
+  }
+
+  /**
+   * Asserts that a newly created sequence has the correct ownership.
+   */
+  public function testPostgreSqlSequenceUpdate() {
+    $database = $this->container->get('database');
+    $db_type = $database->databaseType();
+
+    // Run the updates.
+    $this->runUpdates();
+
+    if ($db_type === 'pgsql') {
+      $sequenceExists = (bool) $database
+        ->query("SELECT pg_get_serial_sequence('{" . $database->prefixTables('pgsql_sequence_test') . "}', 'sequence_field')")
+        ->fetchField();
+      $this->assertTrue($sequenceExists, 'Sequence is owned by the table and column.');
+    }
+    else {
+      $this->assertTrue(TRUE, 'Database update ran successfully on non-pgsql driver.');
+    }
+  }
+
+}