diff --git a/lib/migration.js b/lib/migration.js
index eeaf52c..4636d91 100644
--- a/lib/migration.js
+++ b/lib/migration.js
@@ -224,9 +224,9 @@ function mixinMigration(PostgreSQL) {
       if (self.idColumn(model) === actualField.column) {
         return;
       }
-      if (actualFieldNotPresentInModel(actualField, model)) {
-        sql.push('DROP COLUMN ' + self.escapeName(actualField.column));
-      }
+      // if (actualFieldNotPresentInModel(actualField, model)) {
+      //   sql.push('DROP COLUMN ' + self.escapeName(actualField.column));
+      // }
     });
     if (sql.length > 0) {
       sql = [sql.join(', ')];
@@ -559,7 +559,7 @@ function mixinMigration(PostgreSQL) {
       propName = propName && self.propertyName(model, propName[1]) || null;
       if (!(indexNames.indexOf(indexName) > -1) && !(propName && m.properties[propName] &&
       m.properties[propName].index)) {
-        sql.push('DROP INDEX ' + self.escapeName(indexName));
+        // sql.push('DROP INDEX ' + self.escapeName(indexName));
       } else {
         // The index was found, verify that database matches what we're expecting.
         // first: check single column indexes.
@@ -571,7 +571,7 @@ function mixinMigration(PostgreSQL) {
               !((!si.type || si.type === ai[indexName].type) && (!si.unique || si.unique === ai[indexName].unique))
             ) {
               // Drop the index if the type or unique differs from the actual table
-              sql.push('DROP INDEX ' + self.escapeName(indexName));
+              // sql.push('DROP INDEX ' + self.escapeName(indexName));
               delete ai[indexName];
             }
           }
@@ -597,7 +597,7 @@ function mixinMigration(PostgreSQL) {
           }
 
           if (!identical) {
-            sql.push('DROP INDEX ' + self.escapeName(indexName));
+            // sql.push('DROP INDEX ' + self.escapeName(indexName));
             delete ai[indexName];
           }
         }
diff --git a/lib/postgresql.js b/lib/postgresql.js
index 0a8a26c..c4f1eeb 100644
--- a/lib/postgresql.js
+++ b/lib/postgresql.js
@@ -123,7 +123,7 @@ PostgreSQL.prototype.executeSQL = function(sql, params, options, callback) {
     debug('SQL: %s', sql);
   }
 
-  if (sql && sql.match('UPDATE') && !sql.match('WHERE') && self.settings.blockUpdateWithoutWhere) {
+  if (sql && sql.match(/UPDATE/i) && !sql.match(/WHERE/i) && self.settings.blockUpdateWithoutWhere) {
     return process.nextTick(function() {
       callback(new Error(g.f('Você está executando um update sem WHERE. Corrija essa query, meu caro:',sql)));
     });