diff --git a/src/Contracts/TenantCannotBeCreatedException.php b/src/Contracts/TenantCannotBeCreatedException.php
index 17de2e06..19eac15b 100644
--- a/src/Contracts/TenantCannotBeCreatedException.php
+++ b/src/Contracts/TenantCannotBeCreatedException.php
@@ -12,6 +12,6 @@ abstract class TenantCannotBeCreatedException extends \Exception
 
     public function __construct()
     {
-        $this->message = 'Tenant cannot be craeted. Reason: ' . $this->reason();
+        $this->message = 'Tenant cannot be created. Reason: ' . $this->reason();
     }
 }
diff --git a/src/Exceptions/DomainsOccupiedByOtherTenantException.php b/src/Exceptions/DomainsOccupiedByOtherTenantException.php
new file mode 100644
index 00000000..3c7be5fd
--- /dev/null
+++ b/src/Exceptions/DomainsOccupiedByOtherTenantException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Exceptions;
+
+use Stancl\Tenancy\Contracts\TenantCannotBeCreatedException;
+
+class DomainOccupiedByOtherTenantException extends TenantCannotBeCreatedException
+{
+    public function reason(): string
+    {
+        return "One or more of the tenant's domains are already occupied by another tenant.";
+    }
+}
diff --git a/src/Exceptions/TenantWithThisIdAlreadyExistsException.php b/src/Exceptions/TenantWithThisIdAlreadyExistsException.php
new file mode 100644
index 00000000..fab1268d
--- /dev/null
+++ b/src/Exceptions/TenantWithThisIdAlreadyExistsException.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Exceptions;
+
+use Stancl\Tenancy\Contracts\TenantCannotBeCreatedException;
+
+class TenantWithThisIdAlreadyExistsException extends TenantCannotBeCreatedException
+{
+    /** @var string */
+    protected $id;
+
+    public function reason(): string
+    {
+        return "Tenant with id {$this->id} already exists.";
+    }
+
+    public function __construct(string $id)
+    {
+        parent::__construct();
+
+        $this->id = $id;
+    }
+}
diff --git a/src/StorageDrivers/Database/DatabaseStorageDriver.php b/src/StorageDrivers/Database/DatabaseStorageDriver.php
index b82f2cd9..80984781 100644
--- a/src/StorageDrivers/Database/DatabaseStorageDriver.php
+++ b/src/StorageDrivers/Database/DatabaseStorageDriver.php
@@ -5,7 +5,9 @@ declare(strict_types=1);
 namespace Stancl\Tenancy\StorageDrivers\Database;
 
 use Stancl\Tenancy\Contracts\StorageDriver;
+use Stancl\Tenancy\Exceptions\DomainOccupiedByOtherTenantException;
 use Stancl\Tenancy\Exceptions\TenantCouldNotBeIdentifiedException;
+use Stancl\Tenancy\Exceptions\TenantWithThisIdAlreadyExistsException;
 use Stancl\Tenancy\StorageDrivers\Database\DomainModel as Domains;
 use Stancl\Tenancy\StorageDrivers\Database\Tenants as Tenants;
 use Stancl\Tenancy\Tenant;
@@ -32,7 +34,14 @@ class DatabaseStorageDriver implements StorageDriver
 
     public function ensureTenantCanBeCreated(Tenant $tenant)
     {
-        // todo
+        // todo test this
+        if (Tenants::find($tenant->id)) {
+            throw new TenantWithThisIdAlreadyExistsException($tenant->id);
+        }
+
+        if (Domains::whereIn('domain', [$tenant->domains])->exists()) {
+            throw new DomainOccupiedByOtherTenantException();
+        }
     }
 
     public function getTenantIdByDomain(string $domain): ?string
@@ -56,6 +65,8 @@ class DatabaseStorageDriver implements StorageDriver
     public function updateTenant(Tenant $tenant): void
     {
         // todo
+        // 1. update storage
+        // 2. update domains
     }
 
     public function deleteTenant(Tenant $tenant): void
@@ -64,29 +75,48 @@ class DatabaseStorageDriver implements StorageDriver
         Domains::where('tenant_id', $tenant->id)->delete();
     }
 
+    /**
+     * Get all tenants.
+     *
+     * @param string[] $ids
+     * @return Tenant[]
+     */
     public function all(array $ids = []): array
     {
         return Tenants::getAllTenants($ids)->toArray();
     }
 
+    /**
+     * Get the current tenant.
+     *
+     * @return Tenant
+     */
+    protected function tenant()
+    {
+        return $this->app[Tenant::class];
+    }
+
     public function get(string $key, Tenant $tenant = null)
     {
+        $tenant = $tenant ?? $this->tenant();
         return Tenants::find($tenant->id)->get($key);
     }
 
-    // todo storage methods default to current tenant
     public function getMany(array $keys, Tenant $tenant = null): array
     {
+        $tenant = $tenant ?? $this->tenant();
         return Tenants::find($tenant->id)->getMany($keys);
     }
 
     public function put(string $key, $value, Tenant $tenant = null): void
     {
+        $tenant = $tenant ?? $this->tenant();
         Tenants::find($tenant->id)->put($key, $value);
     }
 
     public function putMany(array $kvPairs, Tenant $tenant = null): void
     {
+        $tenant = $tenant ?? $this->tenant();
         Tenants::find($tenant->id)->putMany($kvPairs);
     }
 }
diff --git a/src/StorageDrivers/RedisStorageDriver.php b/src/StorageDrivers/RedisStorageDriver.php
index 93caf54e..b8a7ddde 100644
--- a/src/StorageDrivers/RedisStorageDriver.php
+++ b/src/StorageDrivers/RedisStorageDriver.php
@@ -10,6 +10,7 @@ use Stancl\Tenancy\Contracts\StorageDriver;
 use Stancl\Tenancy\Exceptions\TenantCouldNotBeIdentifiedException;
 use Stancl\Tenancy\Tenant;
 
+// todo transactions instead of pipelines?
 class RedisStorageDriver implements StorageDriver
 {
     // todo json encoding?
@@ -114,7 +115,6 @@ class RedisStorageDriver implements StorageDriver
     public function all(array $ids = []): array
     {
         // todo $this->redis->pipeline() - return?
-        // todo transaction instead of pipeline?
         $hashes = array_map(function ($hash) {
             return "tenants:{$hash}";
         }, $ids);