diff --git a/release/examples/Makefile b/release/examples/Makefile
index 199b1d03ebc..d56e807bc3e 100644
--- a/release/examples/Makefile
+++ b/release/examples/Makefile
@@ -1,4 +1,4 @@
-TARGETS = db-insert db-insert-bdb db-scan db-scan-bdb
+TARGETS = db-insert db-insert-bdb db-scan db-scan-bdb db-update
 CFLAGS = -g
 CPPFLAGS = -I../include
 LIBTOKUDB = tokudb
diff --git a/release/examples/db-update.c b/release/examples/db-update.c
new file mode 100644
index 00000000000..928c85f0b19
--- /dev/null
+++ b/release/examples/db-update.c
@@ -0,0 +1,196 @@
+// measure the performance of a simulated "insert on duplicate key update" operation
+// the table schema is t(a int, b int, c int, d int, primary key(a, b))
+// a and b are random
+// c is the sum of the observations
+// d is the first observation
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <string.h>
+#include <sys/stat.h>
+#include "db.h"
+
+static int verbose = 0;
+
+static int get_int(void *p) {
+    int v; 
+    memcpy(&v, p, sizeof v);
+    return htonl(v);
+}
+
+static int my_update_callback(DB *db, const DBT *key, const DBT *old_val, const DBT *extra, void (*set_val)(const DBT *new_val, void *set_extra), void *set_extra) {
+    if (old_val == NULL) {
+        // new_val = extra
+        set_val(extra, set_extra);
+    } else {
+        if (verbose) {
+            printf("u"); fflush(stdout);
+        }
+        // new_val = old_val + extra
+        assert(old_val->size == 8 && extra->size == 8);
+        char new_val_buffer[8];
+        memcpy(new_val_buffer, old_val->data, sizeof new_val_buffer);
+        int newc = htonl(get_int(old_val->data) + get_int(extra->data)); // newc = oldc + newc
+        memcpy(new_val_buffer, &newc, sizeof newc);
+        DBT new_val = { .data = new_val_buffer, .size = sizeof new_val_buffer };
+        set_val(&new_val, set_extra);
+    }
+    return 0;
+}
+
+static void insert_and_update(DB_ENV *db_env, DB *db, DB_TXN *txn, int a, int b, int c, int d, bool do_update_callback) {
+    int r;
+
+    // generate the key
+    char key_buffer[8];
+    int newa = htonl(a);
+    memcpy(key_buffer, &newa, sizeof newa);
+    int newb = htonl(b);
+    memcpy(key_buffer+4, &newb, sizeof newb);
+
+    // generate the value
+    char val_buffer[8];
+    int newc = htonl(c);
+    memcpy(val_buffer, &newc, sizeof newc);
+    int newd = htonl(d);
+    memcpy(val_buffer+4, &newd, sizeof newd);
+
+    if (do_update_callback) {
+        // extra = value_buffer, implicit combine column c update function
+        DBT key = { .data = key_buffer, .size = sizeof key_buffer };
+        DBT extra = { .data = val_buffer, .size = sizeof val_buffer };
+        r = db->update(db, txn, &key, &extra, 0); assert(r == 0);
+    } else {
+        DBT key = { .data = key_buffer, .size = sizeof key_buffer };
+        DBT value = { .data = val_buffer, .size = sizeof val_buffer };
+        r = db->put(db, txn, &key, &value, DB_NOOVERWRITE);
+
+        // if key exists then update and put overwrite
+        if (r == DB_KEYEXIST) {
+            if (verbose) {
+                printf("k"); fflush(stdout);
+            }
+
+            DBT oldkey = { .data = key_buffer, .size = sizeof key_buffer };
+            DBT oldvalue; memset(&oldvalue, 0, sizeof oldvalue);
+            r = db->get(db, txn, &oldkey, &oldvalue, 0);
+            assert(r == 0);
+
+            // update it
+            int oldc = get_int(oldvalue.data);
+            newc = htonl(oldc + c); // newc = oldc + newc
+            memcpy(val_buffer, &newc, sizeof newc);
+            r = db->put(db, txn, &key, &value, DB_YESOVERWRITE);
+        }
+        assert(r == 0);
+    }
+}
+
+static inline float tdiff (struct timeval *a, struct timeval *b) {
+    return (a->tv_sec - b->tv_sec) +1e-6*(a->tv_usec - b->tv_usec);
+}
+
+static void insert_and_update_all(DB_ENV *db_env, DB *db, long nrows, long max_rows_per_txn, int key_range, long rows_per_report, bool do_update_callback) {
+    int r;
+    struct timeval tstart;
+    r = gettimeofday(&tstart, NULL); assert(r == 0);
+    struct timeval tlast = tstart;
+    DB_TXN *txn = NULL;
+    r = db_env->txn_begin(db_env, NULL, &txn, 0); assert(r == 0);
+    long n_rows_per_txn = 0;
+    long rowi;
+    for (rowi = 0; rowi < nrows; rowi++) {
+        int a = random() % key_range;
+        int b = random() % key_range;
+        int c = 1;
+        int d = 0; // timestamp
+        insert_and_update(db_env, db, txn, a, b, c, d, do_update_callback);
+        n_rows_per_txn++;
+        
+        // maybe commit
+        if (n_rows_per_txn == max_rows_per_txn) {
+            r = txn->commit(txn, 0); assert(r == 0);
+            r = db_env->txn_begin(db_env, NULL, &txn, 0); assert(r == 0);
+            n_rows_per_txn = 0;
+        }
+
+        // maybe report performance
+        if (((rowi + 1) % rows_per_report) == 0) {
+            struct timeval tnow;
+            r = gettimeofday(&tnow, NULL); assert(r == 0);
+            printf("%.3f %.0f/s %.0f/s\n", tdiff(&tnow, &tlast), rows_per_report/tdiff(&tnow, &tlast), rowi/tdiff(&tnow, &tstart)); fflush(stdout);
+            tlast = tnow;
+        }
+    }
+    
+    r = txn->commit(txn, 0); assert(r == 0);
+}
+
+int main(int argc, char *argv[]) {
+    char *db_env_dir = "update.env";
+    int db_env_open_flags = DB_CREATE | DB_PRIVATE | DB_INIT_MPOOL | DB_INIT_TXN | DB_INIT_LOCK | DB_INIT_LOG;
+    char *db_filename = "update.db";
+    long rows = 100000000;
+    long rows_per_txn = 1000;
+    long rows_per_report = 100000;
+    int key_range = 100000;
+    bool do_update_callback = false;
+
+    int i;
+    for (i = 1; i < argc; i++) {
+        char *arg = argv[i];
+        if (strcmp(arg, "--verbose") == 0) {
+            verbose++;
+            continue;
+        }
+        if (strcmp(arg, "--rows") == 0 && i+1 < argc) {
+            rows = atol(argv[++i]);
+            continue;
+        }
+        if (strcmp(arg, "--rows_per_txn") == 0 && i+1 < argc) {
+            rows_per_txn = atol(argv[++i]);
+            continue;
+        }
+        if (strcmp(arg, "--rows_per_report") == 0 && i+1 < argc) {
+            rows_per_report = atol(argv[++i]);
+            continue;
+        }
+        if (strcmp(arg, "--update_callback") == 0) {
+            do_update_callback = true;
+            continue;
+        }
+
+        assert(0);
+    }
+
+    int r;
+    char rm_cmd[strlen(db_env_dir) + strlen("rm -rf ") + 1];
+    snprintf(rm_cmd, sizeof(rm_cmd), "rm -rf %s", db_env_dir);
+    r = system(rm_cmd); assert(r == 0);
+
+    r = mkdir(db_env_dir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); assert(r == 0);
+
+    // create and open the env
+    DB_ENV *db_env = NULL;
+    r = db_env_create(&db_env, 0); assert(r == 0);
+    db_env->set_update(db_env, my_update_callback);
+    r = db_env->open(db_env, db_env_dir, db_env_open_flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); assert(r == 0);
+
+    // create the db
+    DB *db = NULL;
+    r = db_create(&db, db_env, 0); assert(r == 0);
+    DB_TXN *create_txn = NULL;
+    r = db_env->txn_begin(db_env, NULL, &create_txn, 0); assert(r == 0);
+    r = db->open(db, create_txn, db_filename, NULL, DB_BTREE, DB_CREATE, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); assert(r == 0);
+    r = create_txn->commit(create_txn, 0); assert(r == 0);
+
+    // insert on duplicate key update
+    insert_and_update_all(db_env, db, rows, rows_per_txn, key_range, rows_per_report, do_update_callback);
+
+    // shutdown
+    r = db->close(db, 0); assert(r == 0); db = NULL;
+    r = db_env->close(db_env, 0); assert(r == 0); db_env = NULL;
+
+    return 0;
+}