Oracle八大性能视图之v$session
1、V$SESSION表结构SQL> desc v$session;
名称 是否为空? 类型
----------------------------------------- -------- ----------------------------
SADDR RAW(8)
SID NUMBER
SERIAL# NUMBER
AUDSID NUMBER
PADDR RAW(8)
USER# NUMBER
USERNAME VARCHAR2(30)
COMMAND NUMBER
OWNERID NUMBER
TADDR VARCHAR2(16)
LOCKWAIT VARCHAR2(16)
STATUS VARCHAR2(8)
SERVER VARCHAR2(9)
SCHEMA# NUMBER
SCHEMANAME VARCHAR2(30)
OSUSER VARCHAR2(30)
PROCESS VARCHAR2(12)
MACHINE VARCHAR2(64)
TERMINAL VARCHAR2(16)
PROGRAM VARCHAR2(64)
TYPE VARCHAR2(10)
SQL_ADDRESS RAW(8)
SQL_HASH_VALUE NUMBER
SQL_ID VARCHAR2(13)
SQL_CHILD_NUMBER NUMBER
PREV_SQL_ADDR RAW(8)
PREV_HASH_VALUE NUMBER
PREV_SQL_ID VARCHAR2(13)
PREV_CHILD_NUMBER NUMBER
PLSQL_ENTRY_OBJECT_ID NUMBER
PLSQL_ENTRY_SUBPROGRAM_ID NUMBER
PLSQL_OBJECT_ID NUMBER
PLSQL_SUBPROGRAM_ID NUMBER
MODULE VARCHAR2(48)
MODULE_HASH NUMBER
ACTION VARCHAR2(32)
ACTION_HASH NUMBER
CLIENT_INFO VARCHAR2(64)
FIXED_TABLE_SEQUENCE NUMBER
ROW_WAIT_OBJ# NUMBER
ROW_WAIT_FILE# NUMBER
ROW_WAIT_BLOCK# NUMBER
ROW_WAIT_ROW# NUMBER
LOGON_TIME DATE
LAST_CALL_ET NUMBER
PDML_ENABLED VARCHAR2(3)
FAILOVER_TYPE VARCHAR2(13)
FAILOVER_METHOD VARCHAR2(10)
FAILED_OVER VARCHAR2(3)
RESOURCE_CONSUMER_GROUP VARCHAR2(32)
PDML_STATUS VARCHAR2(8)
PDDL_STATUS VARCHAR2(8)
PQ_STATUS VARCHAR2(8)
CURRENT_QUEUE_DURATION NUMBER
CLIENT_IDENTIFIER VARCHAR2(64)
BLOCKING_SESSION_STATUS VARCHAR2(11)
BLOCKING_INSTANCE NUMBER
BLOCKING_SESSION NUMBER
SEQ# NUMBER
EVENT# NUMBER
EVENT VARCHAR2(64)
P1TEXT VARCHAR2(64)
P1 NUMBER
P1RAW RAW(8)
P2TEXT VARCHAR2(64)
P2 NUMBER
P2RAW RAW(8)
P3TEXT VARCHAR2(64)
P3 NUMBER
P3RAW RAW(8)
WAIT_CLASS_ID NUMBER
WAIT_CLASS# NUMBER
WAIT_CLASS VARCHAR2(64)
WAIT_TIME NUMBER
SECONDS_IN_WAIT NUMBER
STATE VARCHAR2(19)
SERVICE_NAME VARCHAR2(64)
SQL_TRACE VARCHAR2(8)
SQL_TRACE_WAITS VARCHAR2(5)
SQL_TRACE_BINDS VARCHAR2(5)
2、相关SQL
根据lockwait字段可以查询当前正在等待的锁的相关信息：
select * from v$lock where kaddr in (select lockwait from v$session where sid=&sid);
(sql_address,sql_hash_value)，(prev_sql_addr,prev_hash_value) 根据这两组字段, 可以查询到当前session正在执行的或最近一次执行的sql语句的详细信息：
select * from v$sqltext where address = &sql_address and hash_value = &sql_hash_value;
根据PID查SQL相关信息
select> 根据PID查SQL语句
SELECT a.username,a.machine,a.program,a.sid,a.serial#,a.status,c.piece,c.sql_text FROM v$session a,v$process b,v$sqltext c WHERE b.spid='&spid' AND b.addr=a.paddr AND a.sql_address=c.address(+) ORDER BY c.piece;
得到进程的sid号：
select> 得到session的sqltext语句：
select sql_text from v$sqltext_with_newlines where hash_value in (select SQL_HASH_VALUE from v$session where paddr in (select addr from v$process where spid= '&pid')) order by piece;
根据SID查得SQL
select sql_text
from v$sqltext a
where a.hash_value=(select sql_hash_value
from v$session b
where b.SID='&sid')
order by piece ASC
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