postgresql DDL审计

以Postgres10为例：

如下教程需要先安装这个组件：yum install postgresql10-contrib

安装完成后，然后，登录到pgsql，执行如下的一系列命令(以要审计db1为例)：

postgres=# create database db1 ;

postgres=# c db1 ;

db1=# create extension hstore;

db1=# create or replace function ef_alter() returns event_trigger as $$

declare

rec hstore;

begin

select hstore(pg_stat_activity.*) into rec from pg_stat_activity where pid=pg_backend_pid(); -- 记录pg_stat_activity的内容

insert into aud_alter (ctx) values (rec);

end;

$$ language plpgsql strict;

db1=# create event trigger e_alter on ddl_command_end when tag in ('ALTER TABLE') execute procedure ef_alter();

db1=# create table aud_alter(id serial primary key,crt_time timestamp default now(),ctx hstore);

### 测试

db1=# create table test(id int);

db1=# alter table test alter column id type int8;

db1=# x;

db1=# select * from aud_alter;

-[ RECORD 1 ]-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

id | 1

crt_time | 2018-07-29 13:20:14.783321

ctx | "pid"=>"32512","datid"=>"16386","query"=>"alter table test alter column id type int8;","state"=>"active","datname"=>"db1","usename"=>"postgres","usesysid"=>"10","wait_event"=>NULL,"xact_start"=>"2018-07-29 13:40:12.142124+08","backend_xid"=>"698","client_addr"=>NULL,"client_port"=>"-1","query_start"=>"2018-07-29 13:40:12.142124+08","backend_type"=>"client backend","backend_xmin"=>"698","state_change"=>"2018-07-29 13:40:12.142128+08","backend_start"=>"2018-07-29 13:38:50.710944+08","client_hostname"=>NULL,"wait_event_type"=>NULL,"application_name"=>"psql"

db1=# x;

db1=# select each(ctx) from aud_alter where id=1;

each

-------------------------------------------------------

(pid,32512)

(datid,16386)

(query,"alter table test alter column id type int8;")

(state,active)

(datname,db1)

(usename,postgres)

(usesysid,10)

(wait_event,)

(xact_start,"2018-07-29 13:40:12.142124+08")

(backend_xid,698)

(client_addr,)

(client_port,-1)

(query_start,"2018-07-29 13:40:12.142124+08")

(backend_type,"client backend")

(backend_xmin,698)

(state_change,"2018-07-29 13:40:12.142128+08")

(backend_start,"2018-07-29 13:38:50.710944+08")

(client_hostname,)

(wait_event_type,)

(application_name,psql)

(20 rows)

参考：德哥https://yq.aliyun.com/articles/65362

（编辑：李大同）

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