col 命令+查询最消耗cpu资源的SQL语句

COL命令：主要格式化列的显示形式。

该命令有许多选项，具体如下：

COL[UMN] [{ column|expr} [ option ...]]

Option选项可以是如下的子句:

ALI[AS] alias

CLE[AR]

FOLD_A[FTER]

FOLD_B[EFORE]

FOR[MAT] format

HEA[DING] text

JUS[TIFY] {L[EFT]|C[ENTER]|C[ENTRE]|R[IGHT]}

LIKE { expr|alias}

NEWL[INE]

NEW_V[ALUE] variable

NOPRI[NT]|PRI[NT]

NUL[L] text

OLD_V[ALUE] variable

ON|OFF

WRA[PPED]|WOR[D_WRAPPED]|TRU[NCATED]

1). 改变缺省的列标题

COLUMN column_name HEADING column_heading

For example:

Sql>select * from dept;

DEPTNO DNAME LOC

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

10 ACCOUNTING NEW YORK

sql>col LOC heading location

sql>select * from dept;

DEPTNO DNAME location

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

10 ACCOUNTING NEW YORK

2). 将列名ENAME改为新列名EMPLOYEE NAME并将新列名放在两行上：

Sql>select * from emp

Department name Salary

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

10 aaa 11

SQL> COLUMN ENAME HEADING ’Employee|Name’

Sql>select * from emp

Employee

Department name Salary

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

10 aaa 11

note: the col heading turn into two lines from one line.

3). 改变列的显示长度：

FOR[MAT] format

Sql>select empno,ename,job from emp;

EMPNO ENAME JOB

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

7369 SMITH CLERK

7499 ALLEN SALESMAN

7521 WARD SALESMAN

Sql> col ename format a40

EMPNO ENAME JOB

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

7369 SMITH CLERK

7499 ALLEN SALESMAN

7521 WARD SALESMAN

4). 设置列标题的对齐方式

JUS[TIFY] {L[EFT]|C[ENTER]|C[ENTRE]|R[IGHT]}

SQL> col ename justify center

SQL> /

EMPNO ENAME JOB

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

7369 SMITH CLERK

7499 ALLEN SALESMAN

7521 WARD SALESMAN

对于NUMBER型的列，列标题缺省在右边，其它类型的列标题缺省在左边

5). 不让一个列显示在屏幕上

NOPRI[NT]|PRI[NT]

SQL> col job noprint

SQL> /

EMPNO ENAME

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

7369 SMITH

7499 ALLEN

7521 WARD

6). 格式化NUMBER类型列的显示：

SQL> COLUMN SAL FORMAT $99,990

SQL> /

Employee

Department Name Salary Commission

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

30 ALLEN $1,600 300

7). 显示列值时，如果列值为NULL值，用text值代替NULL值

COMM NUL[L] text

SQL>COL COMM NUL[L] text

8). 设置一个列的回绕方式

WRA[PPED]|WOR[D_WRAPPED]|TRU[NCATED]

COL1

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

HOW ARE YOU?

SQL>COL COL1 FORMAT A5

SQL>COL COL1 WRAPPED

COL1

-----

HOW A

RE YO

U?

SQL> COL COL1 WORD_WRAPPED

COL1

-----

HOW

ARE

YOU?

SQL> COL COL1 WORD_WRAPPED

COL1

-----

HOW A

9). 显示列的当前的显示属性值

SQL> COLUMN column_name

10). 将所有列的显示属性设为缺省值

SQL> CLEAR COLUMNS

查询最消耗cpu资源的SQL语句

1. 先通过top命令查看产用资源较多的spid号

2.查询当前耗时的会话ID，用户名，sqlID等：

select sid,serial#,machine,username,program,sql_hash_value,sql_id,

to_char(logon_time,'yyyy/mm/dd hh24:mi:ss') as login_time from v$session

where paddr in (select addr from v$process where spid in ('5648612','256523'));

3. 如果上一步sql_id或者 hash_value不为空，则可用v$sqlarea查出当前正在使用的sql

select sql_text

from v$sqltext_with_newlines

where hash_value = &hash_value

order by piece;

select * from v$sql where sql_id=''

---CSDN 网友提供的----

SELECT sql_text

FROM v$sqltext a

WHERE (a.hash_value, a.address) IN

(SELECT DECODE(sql_hash_value, 0, prev_hash_value, sql_hash_value),

DECODE(sql_hash_value, 0, prev_sql_addr, sql_address)

FROM v$session b

WHERE b.paddr = (SELECT addr FROM v$process
c WHERE c.spid = '&pid'))

ORDER BY piece ASC