首先查看一下v$session都存在哪些列
SYS@ORCL>desc v$session
Name Null? Type
----------------------------------------- -------- ----------------------------
SADDR RAW(4)
SID NUMBER
SERIAL# NUMBER
AUDSID NUMBER
PADDR RAW(4)
USER# NUMBER
USERNAME 2 VARCHAR2(30)
COMMAND NUMBER
OWNERID NUMBER
TADDR VARCHAR2(8)
LOCKWAIT VARCHAR2(8)
STATUS VARCHAR2(8)
SERVER VARCHAR2(9)
SCHEMA# NUMBER
SCHEMANAME VARCHAR2(30)
OSUSER VARCHAR2(30)
PROCESS VARCHAR2(12)
MACHINE VARCHAR2(64)
TERMINAL VARCHAR2(30)
PROGRAM VARCHAR2(48)
TYPE VARCHAR2(10)
SQL_ADDRESS RAW(4)
SQL_HASH_VALUE NUMBER
SQL_ID VARCHAR2(13)
SQL_CHILD_NUMBER NUMBER
PREV_SQL_ADDR RAW(4)
PREV_HASH_VALUE NUMBER
PREV_SQL_ID VARCHAR2(13)
PREV_CHILD_NUMBER 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(4)
P2TEXT VARCHAR2(64)
P2 NUMBER
P2RAW RAW(4)
P3TEXT VARCHAR2(64)
P3 NUMBER
P3RAW RAW(4)
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)
SADDR-——当前会话在内存中的地址
SAD——当前会话的id号
SERIAL# ——会话的串号，当一个会话结束后，另外的会话可能会重用该会话的id号，此时就需要SERIAL#来确定唯一的会话对象。也就是说SID+SERIAL#来确定唯一的会话。
AUDSID——该会话对应的审计会话的id号
PADDR——会话对应的进程地址，关联v$process视图的addr字段可以找到会话对应的操作系统进程。
USER#——会话对应用户的id号，对应dba_users的user_id字段
USERNAME——会话对应用户的USERNAME
COMMAND——正在执行的当前命令类型，记录的是一个数值，要结合下表进行查看