Add performance tuning tutorial and script

_includes/sidebar-data-v2.0.json

@@ -1160,6 +1160,12 @@
           "/${VERSION}/performance-benchmarking-with-tpc-c.html"
         ]
       },
+      {
+        "title": "Performance Tuning",
+        "urls": [
+          "/${VERSION}/performance-tuning.html"
+        ]
+      },
       {
         "title": "Access Management",
         "items": [

_includes/v2.0/performance/tuning.py

@@ -0,0 +1,54 @@
+import argparse
+import psycopg2
+import time
+
+parser = argparse.ArgumentParser(
+    description="test performance of statements against movr database")
+parser.add_argument("--host", required=True,
+    help="ip address of one of the CockroachDB nodes")
+parser.add_argument("--statement", required=True,
+    help="statement to execute")
+parser.add_argument("--repeat", type=int,
+    help="number of times to repeat the statement", default = 20)
+parser.add_argument("--times",
+    help="print time for each repetition of the statement", action="store_true")
+parser.add_argument("--cumulative",
+    help="print cumulative time for all repetitions of the statement", action="store_true")
+args = parser.parse_args()
+
+conn = psycopg2.connect(database='movr', user='root', host=args.host, port=26257)
+conn.set_session(autocommit=True)
+cur = conn.cursor()
+
+times = list()
+for n in range(args.repeat):
+    start = time.time()
+    statement = args.statement
+    cur.execute(statement)
+    if n < 1:
+        if cur.description is not None:
+            colnames = [desc[0] for desc in cur.description]
+            print("")
+            print("Result:")
+            print(colnames)
+            rows = cur.fetchall()
+            for row in rows:
+                print([str(cell) for cell in row])
+    end = time.time()
+    times.append((end - start)* 1000)
+
+cur.close()
+conn.close()
+
+print("")
+if args.times:
+    print("Times (milliseconds):")
+    print(times)
+    print("")
+print("Average time (milliseconds):")
+print(float(sum(times))/len(times))
+print("")
+if args.cumulative:
+    print("Cumulative time (milliseconds):")
+    print(sum(times))
+    print("")