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+---
+slug: 'dbaas'
+---
+
+## How OLM (Operator Lifecycle Manager) works.
+
+DBaaS leverages the installation and upgrade of operators on OLM.
+You must create an operator group and a subscription to install an operator.
+The official documentation with detailed examples can be found [here](https://olm.operatorframework.io/docs/tasks/install-operator-with-olm/).
+
+DBaaS installs the following operators by default:
+- OLM 
+- DBaaS
+- PSMDB
+- PXC
+
+You can manually list the subscriptions using kubectl:
+```
+kubectl get subscriptions
+NAME                                 PACKAGE                           SOURCE                  CHANNEL
+my-percona-server-mongodb-operator   percona-server-mongodb-operator   operatorhubio-catalog   stable
+my-percona-xtradb-cluster-operator   percona-xtradb-cluster-operator   operatorhubio-catalog   stable
+```
+
+### Known issue
+When two or more operators are pending installation approval, OLM creates a second subscription that includes both operators. 
+will have both operators. Listing the install plans could be confusing. For example:
+```
+kubectl get installplans
+NAME            CSV                                       APPROVAL   APPROVED
+install-9rxvz   percona-server-mongodb-operator.v1.13.1   Manual     false
+install-mghbh   percona-server-mongodb-operator.v1.13.1   Manual     false
+```
+Although both install plans seem to be for PSMDB, it's worth examining each separately:
+
+**First install plan**
+
+```
+kubectl get installplan install-9rxvz -oyaml
+apiVersion: operators.coreos.com/v1alpha1
+kind: InstallPlan
+metadata:
+  creationTimestamp: "2023-03-07T12:36:28Z"
+  generateName: install-
+  generation: 1
+  labels:
+    operators.coreos.com/percona-server-mongodb-operator.default: ""
+  name: install-9rxvz
+  namespace: default
+  ownerReferences:
+  - apiVersion: operators.coreos.com/v1alpha1
+    blockOwnerDeletion: false
+    controller: false
+    kind: Subscription
+    name: my-percona-server-mongodb-operator
+    uid: 2581b852-36b3-41e3-92f0-02a4f2ebb05d
+  resourceVersion: "1037"
+  uid: d02807a7-3b24-49eb-b12b-63bc1ef817d6
+spec:
+  approval: Manual
+  approved: false
+  clusterServiceVersionNames:
+  - percona-server-mongodb-operator.v1.13.1
+  generation: 1
+```
+
+**Second install plan**
+
+```
+kubectl get installplan install-mghbh -oyaml
+apiVersion: operators.coreos.com/v1alpha1
+kind: InstallPlan
+metadata:
+  creationTimestamp: "2023-03-07T12:41:46Z"
+  generateName: install-
+  generation: 1
+  labels:
+    operators.coreos.com/percona-xtradb-cluster-operator.default: ""
+  name: install-mghbh
+  namespace: default
+  ownerReferences:
+  - apiVersion: operators.coreos.com/v1alpha1
+    blockOwnerDeletion: false
+    controller: false
+    kind: Subscription
+    name: my-percona-server-mongodb-operator
+    uid: 2581b852-36b3-41e3-92f0-02a4f2ebb05d
+  - apiVersion: operators.coreos.com/v1alpha1
+    blockOwnerDeletion: false
+    controller: false
+    kind: Subscription
+    name: my-percona-xtradb-cluster-operator
+    uid: 6796d009-9a29-49b4-af9b-6af09a895317
+  resourceVersion: "1314"
+  uid: f6a87327-1f60-4cae-8b7a-d881c8c522c2
+spec:
+  approval: Manual
+  approved: false
+  clusterServiceVersionNames:
+  - percona-server-mongodb-operator.v1.13.1
+  - percona-xtradb-cluster-operator.v1.12.0
+  generation: 2
+```
+Spec section of the second install plan indicates it will handle the installation of both operators:
+```
+spec:
+  approval: Manual
+  approved: false
+  clusterServiceVersionNames:
+  - percona-server-mongodb-operator.v1.13.1
+  - percona-xtradb-cluster-operator.v1.12.0
+```
+We can only determine the operators being handled by an install plan if we receive the details in YAML or JSON format.```
+
+## Conclusion
+The short version `kubectl get installplans` will show only the first operator in the list and this can be confusing and misleading but it is not
+a consequence of DBaaS.
+