diff --git a/README.md b/README.md
index a9aeed7..b2c7e46 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,20 @@
-# clickhouse-study
+
+学习ClickHouse笔记
+
+# 源码编译
 
 编译命令
 
 ```bash
+git clone git@github.com:ClickHouse/ClickHouse.git -b 23.4
+cd ClickHouse
+git submodule update --init --recursive
+mkdir build && cd build 
 cmake .. -DCMAKE_CXX_COMPILER=`which clang++` -DCMAKE_C_COMPILER=`which clang` -DCMAKE_BUILD_TYPE=release -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON
+ninja
 ```
 
+# 性能优化
+
+[性能变慢的因素](./bad/README.md)
 
diff --git a/bad/README.md b/bad/README.md
new file mode 100644
index 0000000..c81ed90
--- /dev/null
+++ b/bad/README.md
@@ -0,0 +1,11 @@
+
+本章列举对ClickHouse性能有影响的操作，主要从存储、查询方面来讲。
+
+# 存储相关
+
+## Nullable
+
+使用`Nullable`类型会对性能产生负面影响，在设计数据库的时候要避免使用`Nullable`。
+
+
+
diff --git a/engine/README.md b/engine/README.md
new file mode 100644
index 0000000..b055c98
--- /dev/null
+++ b/engine/README.md
@@ -0,0 +1,16 @@
+
+表引擎详解
+
+# MergeTree
+
+## ReplacingMergeTree
+
+
+## SummingMergeTree
+
+# TinyLog
+
+
+# Memory
+
+