[notebook 1,2]: set all duckdb cons to read_only

Author: gforsyth

01 - Getting Started.ipynb

@@ -73,7 +73,7 @@
    "source": [
     "import ibis\n",
     "\n",
-    "con = ibis.duckdb.connect(\"palmer_penguins.ddb\")"
+    "con = ibis.duckdb.connect(\"palmer_penguins.ddb\", read_only=True)"
    ]
   },
   {
@@ -993,46 +993,6 @@
     "penguins.dropna()"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "id": "50db6247-9d43-4eb2-b7fe-f20fe51b3003",
-   "metadata": {},
-   "source": [
-    "## Exeunt\n",
-    "\n",
-    "Let's clean up the connection we were using before moving on to the next notebook."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "d3838d09-a17d-4746-bc6b-f1484c783feb",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "del con"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "4565fd21-4012-4187-9568-68121e1088db",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "import gc"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "8e26f9f5-ad5f-4188-952c-f96f4d49ac53",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "gc.collect()"
-   ]
-  },
   {
    "cell_type": "markdown",
    "id": "a5b031f9-e20e-4387-b9ee-10a6c06fef18",

02 - Memtables, Joins, and Selectors.ipynb

@@ -957,7 +957,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "con = ibis.duckdb.connect(\"palmer_penguins.ddb\")"
+    "con = ibis.duckdb.connect(\"palmer_penguins.ddb\", read_only=True)"
    ]
   },
   {