diff --git a/roles/oracle-db-install/defaults/main.yml b/roles/oracle-db-install/defaults/main.yml
new file mode 100644
index 0000000..99ea990
--- /dev/null
+++ b/roles/oracle-db-install/defaults/main.yml
@@ -0,0 +1,29 @@
+---
+# Variables par défaut surchargeables pour oracle-db-install
+
+oracle_version: "19.0.0"
+oracle_base: "/u01/app/oracle"
+dbhome: "dbhome_1"
+oracle_home: "{{ oracle_base }}/product/{{oracle_version}}/{{ dbhome }}"
+oracle_inventory: "/u01/app/oraInventory"
+oracle_sources: "/u01/sources"
+oracle_oradata: "/u02/oradata/"
+oracle_fra: "/u03/fast_recovery_area/"
+oracle_install_edition: "EE"
+oracle_zip_filename: "Oracle_Database_19.3.0.0.0_for_Linux_x86-64.zip"
+
+u01_free_space_gb: 8
+tmp_free_space_gb: 1
+etc_free_spage_gb: 1
+var_free_spage_gb: 1
+
+db_response_file: "install_db_{{ oracle_version }}.rsp"
+
+u01_size_gb: 1
+tmp_size_gb: 1
+patch_dir: "{{ oracle_sources }}"
+opatch_file: p6880880_190000_Linux-x86-64.zip
+psu_file: patch_ru.zip
+patch_number: 36233263
+
+scripts_dir: "/home/oracle/scripts"
\ No newline at end of file
diff --git a/roles/oracle-db-install/meta/main.yml b/roles/oracle-db-install/meta/main.yml
new file mode 100644
index 0000000..97567c4
--- /dev/null
+++ b/roles/oracle-db-install/meta/main.yml
@@ -0,0 +1,22 @@
+galaxy_info:
+  role_name: oracle_db_install
+  author: your_name
+  description: Installation des binaires Oracle Database et application des patches
+  company: your_company
+
+  license: MIT
+
+  min_ansible_version: "2.10"
+
+  platforms:
+    - name: EL
+      versions:
+        - "7"
+        - "8"
+        - "9"
+
+  galaxy_tags:
+    - oracle
+    - database
+    - install
+    - patch
\ No newline at end of file
diff --git a/roles/oracle-db-install/tasks/main.yml b/roles/oracle-db-install/tasks/main.yml
index e842c27..9947183 100644
--- a/roles/oracle-db-install/tasks/main.yml
+++ b/roles/oracle-db-install/tasks/main.yml
@@ -1,15 +1,25 @@
 ---
-# 
+#
 # installation des binaires ORACLE et patch
 #
 
+  - name: Vérifier les prérequis pour l'installation
+    ansible.builtin.assert:
+      that:
+        - ansible_memtotal_mb >= 4096
+        - ansible_processor_vcpus >= 2
+      msg: "Prérequis non satisfaits pour Oracle : RAM >= 4GB, CPU >= 2"
+    tags: prerequisites
 
 # installation des binaires Oracle DB
   - include_tasks: install_database.yml
+    tags: install_db
 
 # telechargement des fihiers : opatch + PSU-RU
 #  - include_tasks: download_software.yml
+#    tags: download
 
 # Application du patch
 #  - include_tasks: opatch_apply.yml
+#    tags: patch
 
diff --git a/roles/oracle-db-install/vars/main.yml b/roles/oracle-db-install/vars/main.yml
index e01fc95..08a8a59 100644
--- a/roles/oracle-db-install/vars/main.yml
+++ b/roles/oracle-db-install/vars/main.yml
@@ -1,35 +1,3 @@
 ---
-#--------------------------------------------------------------------
-# paramètres commun
-# dans cette section ne rien modifier sauf si besoin
-#--------------------------------------------------------------------
-
-oracle_version: "19.0.0"
-oracle_base: "/u01/app/oracle"
-dbhome: "dbhome_1"
-oracle_home: "{{ oracle_base }}/product/{{oracle_version}}/{{ dbhome }}"
-oracle_inventory: "/u01/app/oraInventory"
-oracle_sources: "/u01/sources"
-oracle_oradata: "/u02/oradata/"
-oracle_fra: "/u03/fast_recovery_area/"
-oracle_install_edition: "EE"               # SE2 ou EE
-oracle_zip_filename: "Oracle_Database_19.3.0.0.0_for_Linux_x86-64.zip"
-
-# u01_free_space 4 Go pour l'install et 4 Go pour transfert et decompression des zip
-u01_free_space_gb: 8
-tmp_free_space_gb: 1
-etc_free_spage_gb: 1
-var_free_spage_gb: 1
-
-db_response_file: "install_db_{{ oracle_version }}.rsp"
-
-# Variables pour le patch 
-u01_size_gb: 1
-tmp_size_gb: 1
-patch_dir: "{{ oracle_sources }}"
-opatch_file: p6880880_190000_Linux-x86-64.zip
-psu_file: patch_ru.zip
-patch_number: 36233263
-
-# emplacement des sripts du compte oracle
-scripts_dir: "/home/oracle/scripts"
+# Variables communes spécifiques au rôle oracle-db-install
+# Les vars par défaut sont dans defaults/main.yml