/***************** mysql相关SQL ************/
--查看进程，查看是有锁表；
SHOW PROCESSLIST;
--删除进程
kill id;--锁表进程ID
--查看表信息，CREATE_OPTIONS='partitioned'是分区表
SHOW TABLE STATUS;
--查询字符是否有效数字，0否 1是
SELECT replace('20000','.','') REGEXP '^[0-9]*$' ;
/***************** sql server相关SQL ************/
---查看锁表
select request_session_id spid,OBJECT_NAME(resource_associated_entity_id) tableName,*
from sys.dm_tran_locks where resource_type='OBJECT';
---删除锁表进程
declare @spid int --声明参数
Set @spid = 57 --锁表进程ID赋值给参数
declare @sql varchar(1000)
set @sql='kill '+cast(@spid as varchar)
exec(@sql);
--查询SQL语句执行情况
SELECT s2.dbid ,
DB_NAME(s2.dbid) AS [数据库名] ,
--s1.sql_handle ,
( SELECT TOP 1
SUBSTRING(s2.text, statement_start_offset / 2 + 1,
( ( CASE WHEN statement_end_offset = -1
THEN ( LEN(CONVERT(NVARCHAR(MAX), s2.text))
* 2 )
ELSE statement_end_offset
END ) - statement_start_offset ) / 2 + 1)
) AS [语句] ,
execution_count AS [执行次数] ,
last_execution_time AS [上次开始执行计划的时间] ,
total_worker_time AS [自编译以来执行所用的 CPU 时间总量（微秒）] ,
last_worker_time AS [上次执行计划所用的 CPU 时间（微秒）] ,
min_worker_time AS [单次执行期间曾占用的最小 CPU 时间（微秒）] ,
max_worker_time AS [单次执行期间曾占用的最大 CPU 时间（微秒）] ,
total_logical_reads AS [总逻辑读] ,
last_logical_reads AS [上次逻辑读] ,
min_logical_reads AS [最少逻辑读] ,
max_logical_reads AS [最大逻辑读] ,
total_logical_writes AS [总逻辑写] ,
last_logical_writes AS [上次逻辑写] ,
min_logical_writes AS [最小逻辑写] ,
max_logical_writes AS [最大逻辑写]
FROM sys.dm_exec_query_stats AS s1
CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2
WHERE s2.objectid IS NULL
ORDER BY last_worker_time DESC;
/***************** oracle相关SQL ************/
---查询未提交事务
SELECT object_name, machine, s.sid, s.serial#
FROM gv$locked_object l, dba_objects o, gv$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid;
---杀进程
alter system kill session 'sid,serial#';
--查询死锁语句
SELECT a.* FROM v$sql a inner join v$session b on a.HASH_VALUE=b.SQL_HASH_VALUE
join v$locked_object c on b.SID=c.SESSION_ID;
--查询操作执行进度
select sid,OPNAME,TARGET_DESC,sofar,TOTALWORK,trunc(sofar/totalwork*100,2)||'%' as perwork
from v$session_longops where sofar!=totalwork;
--查询表空间使用情况
SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,
2),
'990.99') "使用比",
F.TOTAL_BYTES "空闲空间(M)",
F.MAX_BYTES "最大块(M)"
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT DD.TABLESPACE_NAME,
ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER BY 4 DESC;
----查询表某时刻的数据，找回被删数据
select * from
table_name as of timestamp to_timestamp('20150610 17:30:00','yyyymmdd hh24:mi:ss');
--恢复删除的表，recyclebin 回收站
--先查询表是否被删除在回收站中
select object_name,original_name,partition_name,type,ts_name,createtime,droptime,A.* from recyclebin A
where original_name='TABLE_NAME';
--恢复回收站中的表
flashback table TABLE_NAME to before drop;
--DML最后操作时间
select max(ora_rowscn),to_char(scn_to_timestamp(max(ora_rowscn)),'yyyy-mm-dd hh24:mi:ss') from TABLE_NAME;
--DDL最后操作时间
select TO_CHAR(LAST_DDL_TIME,'YYYY-MM-DD HH24:MI:SS'),a.* FROM user_objects a where object_name='TABLE_NAME';
--查询CLOB对象占用空间，及属于哪个表
SELECT A.TABLE_NAME,
A.COLUMN_NAME,
B.SEGMENT_NAME,
B.SEGMENT_TYPE,
B.TABLESPACE_NAME,
B.BYTES / 1024 / 1024,
B.BLOCKS,
B.EXTENTS
FROM USER_LOBS A, USER_SEGMENTS B
WHERE A.SEGMENT_NAME = B.SEGMENT_NAME
ORDER BY B.BYTES DESC;
----并行设置
--查询表并行设置
select degree from user_tables where table_name='TB_NET_PRICE_DAY_FRONT';
--开启表并行
ALTER TABLE TB_NET_PRICE_DAY PARALLEL;
ALTER TABLE TB_NET_PRICE_DAY_FRONT PARALLEL;
--取消表并行
alter table TB_NET_PRICE_DAY noparallel;
--开启会话并行 DML语句
alter session enable parallel dml;
--取消会话并行
alter session disable parallel dml;
---查询会话是否并行
SELECT pq_status ,pdml_status, pddl_status
FROM v$session WHERE sid=sys_context('userenv','sid');
查找前十条性能差的sql.
SELECT * FROM (select PARSING_USER_ID,EXECUTIONS,SORTS,
COMMAND_TYPE,DISK_READS,sql_text FROM v$sqlarea
order BY disk_reads DESC )where ROWNUM<10 ;
查看占io较大的正在运行的session
SELECT se.sid,se.serial#,pr.SPID,se.username,se.status,
se.terminal,se.program,se.MODULE,、se.sql_address,st.event,st.
p1text,si.physical_reads,
si.block_changes FROM v$session se,v$session_wait st,
v$sess_io si,v$process pr WHERE st.sid=se.sid AND st.
sid=si.sid AND se.PADDR=pr.ADDR AND se.sid>6 AND st.
wait_time=0 AND st.event NOT LIKE '%SQL%' ORDER BY physical_reads DESC;
---正在执行的
select a.username, a.sid,b.SQL_TEXT, b.SQL_FULLTEXT
from v$session a, v$sqlarea b
where a.sql_address = b.address
---执行过的
select b.SQL_TEXT,b.FIRST_LOAD_TIME,b.SQL_FULLTEXT
from v$sqlarea b
where b.FIRST_LOAD_TIME between '2018-08-08 09:24:47' and
'2018-08-09 09:24:47' order by b.FIRST_LOAD_TIME