diff --git a/tests/script/tsim/db/alter_option.sim b/tests/script/tsim/db/alter_option.sim
index b6139cea13..63018aea8c 100644
--- a/tests/script/tsim/db/alter_option.sim
+++ b/tests/script/tsim/db/alter_option.sim
@@ -38,7 +38,7 @@ endi
 
 print ============= create database
 #database_option: {
-#  | BUFFER value       [3~16384, default: 96]
+#  | BUFFER value       [3~16384, default: 256]
 #  | PAGES value        [64~16384, default: 256]
 #  | CACHEMODEL value   ['node', 'last_row', 'last_value', 'both']
 #  | WAL_FSYNC_PERIOD value        [0 ~ 180000 ms]
@@ -78,7 +78,7 @@ endi
 if $data7_db != 1440000m,1440000m,1440000m then # keep
   return -1
 endi
-if $data8_db != 96 then  # buffer
+if $data8_db != 256 then  # buffer
   return -1
 endi
 if $data9_db != 4 then  # pagesize
diff --git a/tests/script/tsim/db/create_all_options.sim b/tests/script/tsim/db/create_all_options.sim
index 5ac2ee6c4e..7012fbac6c 100644
--- a/tests/script/tsim/db/create_all_options.sim
+++ b/tests/script/tsim/db/create_all_options.sim
@@ -37,7 +37,7 @@ endi
 
 print ============= create database with all options
 #database_option: {
-#  | BUFFER value       [3~16384, default: 96]
+#  | BUFFER value       [3~16384, default: 256]
 #  | PAGES value        [64~16384, default: 256]
 #  | PAGESIZE value     [1~16384, default: 4]
 #  | CACHEMODEL value   ['node', 'last_row', 'last_value', 'both', default: 'node']
@@ -98,7 +98,7 @@ endi
 if $data7_db != 5256000m,5256000m,5256000m then # keep
   return -1
 endi
-if $data8_db != 96 then  # buffer
+if $data8_db != 256 then  # buffer
   return -1
 endi
 if $data9_db != 4 then  # pagesize
diff --git a/tests/system-test/1-insert/alter_database.py b/tests/system-test/1-insert/alter_database.py
index 1918c0ef76..aec18a1cf1 100644
--- a/tests/system-test/1-insert/alter_database.py
+++ b/tests/system-test/1-insert/alter_database.py
@@ -10,37 +10,43 @@ from util.sql import *
 from util.cases import *
 from util.dnodes import *
 
+
 class TDTestCase:
     def init(self, conn, logSql, replicaVar=1):
         self.replicaVar = int(replicaVar)
         tdLog.debug("start to execute %s" % __file__)
-        tdSql.init(conn.cursor(),logSql)
-        self.buffer_boundary = [3,4097,8193,12289,16384]
-        self.buffer_error = [self.buffer_boundary[0]-1,self.buffer_boundary[-1]+1,12289,96]
+        tdSql.init(conn.cursor(), logSql)
+        self.buffer_boundary = [3, 4097, 8193, 12289, 16384]
+        self.buffer_error = [self.buffer_boundary[0] -
+                             1, self.buffer_boundary[-1]+1, 12289, 256]
         # pages_boundary >= 64
-        self.pages_boundary = [64,128,512]
+        self.pages_boundary = [64, 128, 512]
         self.pages_error = [self.pages_boundary[0]-1]
+
     def alter_buffer(self):
         tdSql.execute('create database db')
         for buffer in self.buffer_boundary:
             tdSql.execute(f'alter database db buffer {buffer}')
-            tdSql.query('select * from information_schema.ins_databases where name = "db"')
-            tdSql.checkEqual(tdSql.queryResult[0][8],buffer)    
+            tdSql.query(
+                'select * from information_schema.ins_databases where name = "db"')
+            tdSql.checkEqual(tdSql.queryResult[0][8], buffer)
         tdSql.execute('drop database db')
         tdSql.execute('create database db vgroups 10')
         for buffer in self.buffer_error:
             tdSql.error(f'alter database db buffer {buffer}')
         tdSql.execute('drop database db')
-    
+
     def alter_pages(self):
         tdSql.execute('create database db')
         for pages in self.pages_boundary:
             tdSql.execute(f'alter database db pages {pages}')
-            tdSql.query('select * from information_schema.ins_databases where name = "db"')
-            tdSql.checkEqual(tdSql.queryResult[0][10],pages)
+            tdSql.query(
+                'select * from information_schema.ins_databases where name = "db"')
+            tdSql.checkEqual(tdSql.queryResult[0][10], pages)
         tdSql.execute('drop database db')
         tdSql.execute('create database db')
-        tdSql.query('select * from information_schema.ins_databases where name = "db"')
+        tdSql.query(
+            'select * from information_schema.ins_databases where name = "db"')
         self.pages_error.append(tdSql.queryResult[0][10])
         for pages in self.pages_error:
             tdSql.error(f'alter database db pages {pages}')
@@ -55,5 +61,6 @@ class TDTestCase:
         tdSql.close()
         tdLog.success(f"{__file__} successfully executed")
 
+
 tdCases.addLinux(__file__, TDTestCase())
-tdCases.addWindows(__file__, TDTestCase())
\ No newline at end of file
+tdCases.addWindows(__file__, TDTestCase())