1、通过TOP 命令查看PID:

PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                         1560 oracle    20   0 38.978g 0.038t  16296 R 100.0 15.3   1069:13 python3 Main_Mem.py ProcessLog1 config.ini

2、通过spid 查找对应SQL:

-- 1、通过spid查找对应内存地址：SELECT addr FROM v$process c WHERE c.spid = 1560 ;-- 2、通过内存地址寻址hash值：SELECT DECODE (sql_hash_value,0, prev_hash_value,sql_hash_value),DECODE (sql_hash_value, 0, prev_sql_addr, sql_address)FROM v$session bWHERE b.paddr = '00000004B08F4DC8';-- 3、通过hash值找到对应sql_id：select a.sql_text,a.sql_id From v$sqltext a where a.hash_value='3838526855' and a.address='00000004DBAE9638' order by piece;-- 4、通过sql_id查找详细的sql查询脚本：select SQL_TEXT,SQL_FULLTEXT,SQL_ID,LOADS,FIRST_LOAD_TIME,PLSQL_EXEC_TIME,JAVA_EXEC_TIME,ROWS_PROCESSED,COMMAND_TYPE,PARSING_USER_ID,PARSING_SCHEMA_ID,PARSING_SCHEMA_NAME,KEPT_VERSIONS,ADDRESS,SERVICE,MODULE,MODULE_HASH,ACTION,CPU_TIME,ELAPSED_TIME,OUTLINE_SID,CHILD_ADDRESS,SQLTYPE,REMOTE,OBJECT_STATUS,LITERAL_HASH_VALUE,LAST_LOAD_TIME,PROGRAM_ID,PROGRAM_LINE#,LAST_ACTIVE_TIMEfrom  v$sql where sql_id='{sqlID}'

3、查找到的sql主要分为三类：

1、where条件缺少主键；

2、where条件缺少索引；

3、对应主表数据量太大。