下面是一些有用的tips:

**In psql, tag your queries and use Ctrl+R**
```
[local]:5432 pg12@testdb=# select * from t1 limit 1;
 id | c1 | c2 
----+----+----
  4 |  4 |  4
(1 row)

Time: 1.872 ms
[local]:5432 pg12@testdb=# select * from test limit 1;
ERROR:  relation "test" does not exist
LINE 1: select * from test limit 1;
                      ^
Time: 0.996 ms
[local]:5432 pg12@testdb=# create table test(id int);
CREATE TABLE
Time: 6.019 ms
[local]:5432 pg12@testdb=# insert into test values(1);
INSERT 0 1
Time: 2.310 ms
[local]:5432 pg12@testdb=# insert into test values(2);
INSERT 0 1
Time: 2.409 ms
```
这时候使用快捷键Ctrl + R,显示搜索框,输入t1,psql检索t1相关的sql并显示在界面上.
```
(reverse-i-search)`': 
(reverse-i-search)`t1': select * from t1 limit 1;
```

**Better psql output**
\x不够强大,可使用pspg.

**Get a stack trace for an error**
使用gdb在errfinish上设置断点可跟踪错误
```
[local]:5432 pg12@testdb=# SELECT pg_backend_pid();
 pg_backend_pid 
----------------
           1538
(1 row)
...
(gdb) b errfinish
Breakpoint 1 at 0xa65517: file elog.c, line 412.
(gdb) c
Continuing.
```
如出现执行错误,会在gdb中停止,利用bt可打印调用栈

**参考资料**
[Postgres tips for the average and power user](https://www.citusdata.com/blog/2019/07/17/postgres-tips-for-average-and-power-user/)

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PostgreSQL DBA(69) - Postgres tips for the average and power user

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