diff --git a/tools/db_bench_tool.cc b/tools/db_bench_tool.cc
index d1911aa4c3e6d73e22d06230e2d9efe24ffb83b1..70746d0e2136451911b640bc14534f3c1dd82142 100644
--- a/tools/db_bench_tool.cc
+++ b/tools/db_bench_tool.cc
@@ -4667,23 +4667,25 @@ void VerifyDBFromDB(std::string& truth_db_name) {
     int64_t seek = 0;
     int64_t seek_found = 0;
     int64_t bytes = 0;
-    int64_t value_max = FLAGS_mix_max_value_size;
+    const int64_t default_value_max = 64*1024*1024;
+    int64_t value_max = default_value_max;
     int64_t scan_len_max = FLAGS_mix_max_scan_len;
     double write_rate = 1000000.0;
     double read_rate = 1000000.0;
-    std::vector<double> ratio;
-    char value_buffer[2 * value_max];
+    std::vector<double> ratio {FLAGS_mix_get_ratio,
+        FLAGS_mix_put_ratio, FLAGS_mix_seek_ratio};
+    char value_buffer[default_value_max];
     QueryDecider query;
     RandomGenerator gen;
     Status s;
+    if(value_max > FLAGS_mix_max_value_size) {
+      value_max = FLAGS_mix_max_value_size;
+    }
 
     ReadOptions options(FLAGS_verify_checksum, true);
     std::unique_ptr<const char[]> key_guard;
     Slice key = AllocateKey(&key_guard);
     PinnableSlice pinnable_val;
-    ratio.push_back(FLAGS_mix_get_ratio);
-    ratio.push_back(FLAGS_mix_put_ratio);
-    ratio.push_back(FLAGS_mix_seek_ratio);
     query.Initiate(ratio);
 
     // the limit of qps initiation