Querying SQL statements that are executing and executing in Oracle _oracle

Querying the SQL statement that Oracle is executing and the user executing the statement

SELECT b.sid Oracleid,
    b.username login Oracle username,
    b.serial#,
    spid operating system ID,
    paddr,
    sql_text Executing sql ,
    b.machine computer name from
v$process A, v$session B, V$sqlarea c
WHERE a.addr = b.paddr and
  b.sql_hash_value = C.hash_value

The executing SQL statement code given by other netizens

Select A.username, A.sid,b.sql_text, b.sql_fulltext from
 v$session A, V$sqlarea b 
where a.sql_address = B.address 
---Executed
select B.sql_text,b.first_load_time,b.sql_fulltext from
 v$sqlarea b
where B. First_load_time between ' 2016-10-1/09:24:47 ' and
    ' 2016-10-1/09:24:47 ' ORDER by B.first_load_time

(This method benefits a view of SQL that has been executed for a period of time, and Sql_fulltext contains complete SQL statements)

Other

Select Osuser,program,username,schemaname,b.cpu_time,status,b.sql_text from 
v$session A left JOIN v$sql B on A.SQL_ Address=b.address and A.sql_hash_value=b.hash_value ORDER BY b.cpu_time desc 

Select Address, sql_text, piece 
 From V$session, v$sqltext 
where address = sql_address 
 --and machine = < you machine name > 

To view the issuing program of the initiator who is executing SQL

SELECT osuser Computer Login identity,
    program to initiate the request,
    USERNAME login system username,
    SCHEMANAME,
    b.cpu_time spend Cpu time,
    STATUS,
    B.sql_text executes SQL from
v$session a left
JOIN v$sql B on a.sql_address = b.address and
          a.sql_h Ash_value = B.hash_value ORDER by
B.cpu_time DESC

Identify Oracle's current locked object

SELECT l.session_id Sid,
    s.serial#,
    l.locked_mode lock mode,
    l.oracle_username login user,
    l.os_user_name Login machine username,
    s.machine machine name,
    s.terminal end user name,
    o.object_name locked object name,
    s.logon_time login database time from
v$  Locked_object L, all_objects o, v$session s
WHERE l.object_id = o.object_id and
  l.session_id = S.sid
Order by Sid, S.serial#;

Kill off the current lock object can be

Alter system kill session ' Sid, S.serial# ';

Find the first 10 poor performance SQL.

SELECT * FROM (select Parsing_user_id,executions,sorts, 
command_type,disk_reads,sql_text from V$sqlarea 

View the larger running session for IO

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

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