diff --git a/lab7-transaction/4-1-backup.sh b/lab7-transaction/4-1-backup.sh
new file mode 100644
index 0000000..3c21879
--- /dev/null
+++ b/lab7-transaction/4-1-backup.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+sudo su - opengauss
+
+gs_ctl start
+
+mkdir -p ~/backup
+gs_basebackup -D ~/backup -p 7654
+
+cd ~/backup || exit 1
+ls
diff --git a/lab7-transaction/4-2-recover.sh b/lab7-transaction/4-2-recover.sh
new file mode 100644
index 0000000..292836e
--- /dev/null
+++ b/lab7-transaction/4-2-recover.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+sudo su - opengauss
+
+gs_ctl stop
+
+cd ~/data || exit 1
+ls
+
+rm -rf ./*
+ls
+
+cp -r ~/backup/. .
diff --git a/lab7-transaction/run.sh b/lab7-transaction/run.sh
new file mode 100644
index 0000000..ec32ced
--- /dev/null
+++ b/lab7-transaction/run.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+# config
+db_hostname=127.0.0.1
+db_port=7654
+db_name="buptlab_database"
+db_user="bupt_dba"
+db_password="i_am_from_bupt666"
+sql_dir="./lab7-transaction/sql"
+
+# check arguments
+if [ $# -ne 1 ]; then
+    echo "Usage: $0 <file-code>"
+    exit 1
+fi
+task_id=$1
+
+# get the sql filepath
+sql_filepath="${sql_dir}/${task_id}.sql"
+
+# check if the file exists
+if [ ! -f "${sql_filepath}" ]; then
+    echo "Error: File does not exist - ${sql_filepath}"
+    exit 1
+fi
+
+# create two copy
+gsql \
+    --host="${db_hostname}" \
+    --port="${db_port}" \
+    -d "${db_name}" \
+    --username="${db_user}" \
+    --password="${db_password}" \
+    -echo-all \
+    -f "./lab7-transaction/sql/init.sql" \
+    >/dev/null
+
+# execute the sql
+gsql \
+    --host="${db_hostname}" \
+    --port="${db_port}" \
+    -d "${db_name}" \
+    --username="${db_user}" \
+    --password="${db_password}" \
+    -echo-all \
+    -f "${sql_filepath}"
diff --git a/lab7-transaction/sql/1-1-check_violation.sql b/lab7-transaction/sql/1-1-check_violation.sql
new file mode 100644
index 0000000..6a7cd4b
--- /dev/null
+++ b/lab7-transaction/sql/1-1-check_violation.sql
@@ -0,0 +1,5 @@
+select * from partsupp_1 where ps_availqty < 10;
+
+update partsupp_1 set ps_availqty = ps_availqty - 8 where ps_availqty < 10;
+
+select * from partsupp_1 where ps_availqty < 10;
diff --git a/lab7-transaction/sql/1-2-commit_and_rollback.sql b/lab7-transaction/sql/1-2-commit_and_rollback.sql
new file mode 100644
index 0000000..667ebd7
--- /dev/null
+++ b/lab7-transaction/sql/1-2-commit_and_rollback.sql
@@ -0,0 +1,17 @@
+-- commit
+begin transaction;
+    select ps_partkey, ps_supplycost from partsupp_1 where ps_partkey between '2020' and '2022';
+    update partsupp_1 set ps_supplycost = 200 where ps_partkey between '2020' and '2022';
+    select ps_partkey, ps_supplycost from partsupp_1 where ps_partkey between '2020' and '2022';
+commit transaction;
+
+select ps_partkey, ps_supplycost from partsupp_1 where ps_partkey between '2020' and '2022';
+
+-- rollback
+begin transaction;
+    select ps_partkey, ps_supplycost from partsupp_2 where ps_partkey between '2020' and '2022';
+    update partsupp_2 set ps_supplycost = 200 where ps_partkey between '2020' and '2022';
+    select ps_partkey, ps_supplycost from partsupp_2 where ps_partkey between '2020' and '2022';
+rollback transaction;
+
+select ps_partkey, ps_supplycost from partsupp_2 where ps_partkey between '2020' and '2022';
diff --git a/lab7-transaction/sql/1-3-schema_modification.sql b/lab7-transaction/sql/1-3-schema_modification.sql
new file mode 100644
index 0000000..8eb6eab
--- /dev/null
+++ b/lab7-transaction/sql/1-3-schema_modification.sql
@@ -0,0 +1,27 @@
+-- delete column os_availqty from partsupp_1 with commit
+begin transaction;
+    alter table partsupp_1 drop column ps_availqty;
+commit transaction;
+
+select ps_availqty from partsupp_1;
+
+-- delete column os_availqty to partsupp_2 with rollback
+begin transaction;
+    alter table partsupp_2 drop column ps_availqty;
+rollback transaction;
+
+select ps_availqty from partsupp_2;
+
+-- add column ps_availqty to partsupp_1 with commit
+begin transaction;
+    alter table partsupp_1 add column ps_availqty_new integer;
+commit transaction;
+
+select ps_availqty_new from partsupp_1;
+
+-- add column ps_availqty to partsupp_2 with rollback
+begin transaction;
+    alter table partsupp_2 add column ps_availqty_new integer;
+rollback transaction;
+
+select ps_availqty_new from partsupp_2;
diff --git a/lab7-transaction/sql/1-4-data_modifications.sql b/lab7-transaction/sql/1-4-data_modifications.sql
new file mode 100644
index 0000000..a9e5904
--- /dev/null
+++ b/lab7-transaction/sql/1-4-data_modifications.sql
@@ -0,0 +1,13 @@
+-- simple sql
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_availqty < 10;
+insert into partsupp_1 values (2022, 2022, 7, 0, 'comment');
+delete from partsupp_1 where ps_partkey = '2022' and ps_suppkey = '2022';
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_availqty < 10;
+
+-- run as transaction
+begin transaction;
+    select ps_partkey, ps_suppkey, ps_availqty from partsupp_2 where ps_availqty < 10;
+    insert into partsupp_2 values (2022, 2022, 7, 0, 'comment');
+    delete from partsupp_2 where ps_partkey = '2022' and ps_suppkey = '2022';
+    select ps_partkey, ps_suppkey, ps_availqty from partsupp_2 where ps_availqty < 10;
+commit transaction;
diff --git a/lab7-transaction/sql/1-5-savepoint.sql b/lab7-transaction/sql/1-5-savepoint.sql
new file mode 100644
index 0000000..b5528ed
--- /dev/null
+++ b/lab7-transaction/sql/1-5-savepoint.sql
@@ -0,0 +1,13 @@
+begin transaction;
+    select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_availqty < 10;
+    insert into partsupp_1 values (2022, 2022, 7, 0, 'comment');
+
+    savepoint sp;
+
+    delete from partsupp_1 where ps_partkey = '2022' and ps_suppkey = '2022';
+
+    rollback to sp;
+
+commit transaction;
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_partkey = '2022' and ps_suppkey = '2022';
diff --git a/lab7-transaction/sql/1-6-failure.sql b/lab7-transaction/sql/1-6-failure.sql
new file mode 100644
index 0000000..75db07a
--- /dev/null
+++ b/lab7-transaction/sql/1-6-failure.sql
@@ -0,0 +1,7 @@
+begin transaction;
+    select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_availqty < 10;
+    insert into partsupp_1 values (999999, 999999, 7, 0, 'comment');
+    update partsupp_1 set ps_availqty = ps_availqty - 8 where ps_availqty < 10;
+commit transaction;
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_partkey = '999999' and ps_suppkey = '999999';
diff --git a/lab7-transaction/sql/2-1-read_committed.sql b/lab7-transaction/sql/2-1-read_committed.sql
new file mode 100644
index 0000000..d5f9078
--- /dev/null
+++ b/lab7-transaction/sql/2-1-read_committed.sql
@@ -0,0 +1,34 @@
+-- 1. dirty read
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+start transaction isolation level read committed;
+
+update partsupp_1 set ps_availqty = 6 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+-- 2. replicated read
+start transaction isolation level read committed;
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+update partsupp_1 set ps_availqty = 6 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+commit;
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_1 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+commit;
+
+-- 3. illusion read
+start transaction isolation level read committed;
+
+select * from partsupp_1 where ps_partkey = '2022' and ps_suppkey between '23' and '2022';
+
+insert into partsupp_1 values ('2022', '2022', 0, 0, 'comment');
+
+commit;
+
+select * from partsupp_1 where ps_partkey = '2022' and ps_suppkey between '23' and '2022';
+
+commit;
diff --git a/lab7-transaction/sql/2-2-repeatable_read.sql b/lab7-transaction/sql/2-2-repeatable_read.sql
new file mode 100644
index 0000000..d1013ed
--- /dev/null
+++ b/lab7-transaction/sql/2-2-repeatable_read.sql
@@ -0,0 +1,34 @@
+-- 1. dirty read
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_2 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+start transaction isolation level repeatable read;
+
+update partsupp_2 set ps_availqty = 6 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_2 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+-- 2. replicated read
+start transaction isolation level repeatable read;
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_2 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+update partsupp_2 set ps_availqty = 6 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+commit;
+
+select ps_partkey, ps_suppkey, ps_availqty from partsupp_2 where ps_partkey = '2022' and ps_suppkey = '1526';
+
+commit;
+
+-- 3. illusion read
+start transaction isolation level repeatable read;
+
+select * from partsupp_2 where ps_partkey = '2022' and ps_suppkey between '23' and '2022';
+
+insert into partsupp_2 values ('2022', '2022', 0, 0, 'comment');
+
+commit;
+
+select * from partsupp_2 where ps_partkey = '2022' and ps_suppkey between '23' and '2022';
+
+commit;
diff --git a/lab7-transaction/sql/3-deadlock.sql b/lab7-transaction/sql/3-deadlock.sql
new file mode 100644
index 0000000..5a66338
--- /dev/null
+++ b/lab7-transaction/sql/3-deadlock.sql
@@ -0,0 +1,22 @@
+-- 1. repeatable read deadlock
+-- session 1
+start transaction isolation level repeatable read;
+select ps_partkey from partsupp_1 where ps_suppkey=1526 for update;
+
+-- session 2
+start transaction isolation level repeatable read;
+select ps_suppkey from partsupp_1 where ps_partkey=2022 for update;
+
+-- 2. particle size
+-- session 1
+start transaction isolation level repeatable read;
+select ps_partkey from partsupp_1 where ps_suppkey=20 for update;
+
+-- session 2
+start transaction isolation level repeatable read;
+
+select ps_suppkey from partsupp_1 where ps_partkey=2022 for update;
+
+select ps_partkey from partsupp_1 where ps_suppkey=22 for update;
+
+select ps_partkey from partsupp_1 where ps_suppkey=20 for update;
diff --git a/lab7-transaction/sql/init.sql b/lab7-transaction/sql/init.sql
new file mode 100644
index 0000000..49a7724
--- /dev/null
+++ b/lab7-transaction/sql/init.sql
@@ -0,0 +1,24 @@
+drop table if exists partsupp_1;
+drop table if exists partsupp_2;
+
+create table partsupp_1 (
+    ps_partkey integer not null,
+    ps_suppkey integer not null,
+    ps_availqty integer not null,
+    ps_supplycost decimal(15, 2) not null,
+    ps_comment varchar(199) not null
+);
+
+create table partsupp_2 (
+    ps_partkey integer not null,
+    ps_suppkey integer not null,
+    ps_availqty integer not null,
+    ps_supplycost decimal(15, 2) not null,
+    ps_comment varchar(199) not null
+);
+
+insert into partsupp_1 select * from partsupp;
+insert into partsupp_2 select * from partsupp;
+
+alter table partsupp_1 add constraint partsupp_chk_1 check (ps_availqty >= 0);
+alter table partsupp_2 add constraint partsupp_chk_2 check (ps_availqty >= 0);