查询oracle比较慢的session和sql

SQL_TEXTVARCHAR2(1000) First thousand characters of the SQL text for the current cursor SQL_IDVARCHAR2(13) SQL identifier of the parent cursor in the library cache SHARABLE_MEMNUMBER Amount of shared memory used by a cursor. If multiple child cursors exist,then the sum of all shared memory used by all child cursors. PERSISTENT_MEMNUMBER Fixed amount of memory used for the lifetime of an open cursor. If multiple child cursors exist,the fixed sum of memory used for the lifetime of all the child cursors. RUNTIME_MEMNUMBER Fixed amount of memory required during execution of a cursor. If multiple child cursors exist,the fixed sum of all memory required during execution of all the child cursors. SORTSNUMBER Sum of the number of sorts that were done for all the child cursors VERSION_COUNTNUMBER Number of child cursors that are present in the cache under this parent LOADED_VERSIONSNUMBER Number of child cursors that are present in the cache and have their context heap (KGL heap 6) loaded OPEN_VERSIONSNUMBER The number of child cursors that are currently open under this current parent USERS_OPENINGNUMBER Number of users that have any of the child cursors open FETCHESNUMBER Number of fetches associated with the SQL statement EXECUTIONSNUMBER Total number of executions,totalled over all the child cursors END_OF_FETCH_COUNTNUMBER Number of times this cursor was fully executed since the cursor was brought into the library cache. The value of this statistic is not incremented when the cursor is partially executed,either because it failed during the execution or because only the first few rows produced by this cursor are fetched before the cursor is closed or re-executed. By definition,the value of the END_OF_FETCH_COUNT column should be less or equal to the value of the EXECUTIONS column. USERS_EXECUTINGNUMBER Total number of users executing the statement over all child cursors LOADSNUMBER Number of times the object was loaded or reloaded FIRST_LOAD_TIMEVARCHAR2(19) Timestamp of the parent creation time INVALIDATIONSNUMBER Total number of invalidations over all the child cursors PARSE_CALLSNUMBER Sum of all parse calls to all the child cursors under this parent DISK_READSNUMBER Sum of the number of disk reads over all child cursors DIRECT_WRITESNUMBER Sum of the number of direct writes over all child cursors BUFFER_GETSNUMBER Sum of buffer gets over all child cursors APPLICATION_WAIT_TIMENUMBER Application wait time CONCURRENCY_WAIT_TIMENUMBER Concurrency wait time CLUSTER_WAIT_TIMENUMBER Cluster wait time USER_IO_WAIT_TIMENUMBER User I/O Wait Time PLSQL_EXEC_TIMENUMBER PL/SQL execution time JAVA_EXEC_TIMENUMBER Java execution time ROWS_PROCESSEDNUMBER Total number of rows processed on behalf of this SQL statement COMMAND_TYPENUMBER Oracle command type definition OPTIMIZER_MODEVARCHAR2(25) Mode under which the SQL statement was executed PARSING_USER_IDNUMBER User ID of the user that has parsed the very first cursor under this parent PARSING_SCHEMA_IDNUMBER Schema ID that was used to parse this child cursor KEPT_VERSIONSNUMBER Number of child cursors that have been marked to be kept using the DBMS_SHARED_POOL package ADDRESSRAW(4 | 8) Address of the handle to the parent for this cursor HASH_VALUENUMBER Hash value of the parent statement in the library cache OLD_HASH_VALUENUMBER Old SQL hash value MODULEVARCHAR2(64) Contains the name of the module that was executing at the time that the SQL statement was first parsed as set by calling DBMS_APPLICATION_INFO .SET_MODULEMODULE_HASHNUMBER Hash value of the module that is named in the MODULE column ACTIONVARCHAR2(64) Contains the name of the action that was executing at the time that the SQL statement was first parsed as set by calling DBMS_APPLICATION_INFO .SET_ACTIONACTION_HASHNUMBER Hash value of the action that is named in the ACTION column SERIALIZABLE_ABORTSNUMBER Number of times the transaction fails to serialize,producing ORA-08177 errors,totalled over all the child cursors CPU_TIMENUMBER CPU time (in microseconds) used by this cursor for parsing/executing/fetching ELAPSED_TIMENUMBER Elapsed time (in microseconds) used by this cursor for parsing/executing/fetching IS_OBSOLETEVARCHAR2(1) Indicates whether the cursor has become obsolete (Y ) or not (N ). This can happen if the number of child cursors is too large. CHILD_LATCHNUMBER Child latch number that is protecting the cursor PROGRAM_IDNUMBER

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--查询最慢的sql select * from ( select parsing_user_id,executions,sorts command_type,disk_reads,sql_text from v$sqlarea order by disk_reads desc )where rownum<10 --查询对应session select SE.SID,SE.SERIAL#,PR.SPID, SE.USERNAME,SE.STATUS,SE.TERMINAL, SE.PROGRAM,SE.MODULE, SE.SQL_ADDRESS,ST.EVENT, ST.P1TEXT,SI.PHYSICAL_READS,SI.BLOCK_CHANGES from v$session se,v$session_wait st, v$sess_io si,v$process pr where st.SID=se.SID and st.SID=si.SID AND SE.PADDR=PR.ADDR AND SE.SID>6 AND ST.WAIT_TIME=0 AND ST.EVENT NOT LIKE '%SQL%' ORDER BY PHYSICAL_READS DESC; SELECT sql_address FROM V$SESSION SS,V$SQLTEXT TT WHERE SS.SQL_HASH_VALUE=TT.HASH_VALUE AND SID=439; v$sqltext：存储的是完整的SQL,SQL被分割 v$sqlarea：存储的SQL 和一些相关的信息，比如累计的执行次数，逻辑读，物理读等统计信息（统计） v$sql：内存共享SQL区域中已经解析的SQL语句。（即时） 根据sid查找完整sql语句： 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 select a.CPU_TIME,--CPU时间 百万分之一（微秒） a.OPTIMIZER_MODE,--优化方式 a.EXECUTIONS,--执行次数 a.DISK_READS,--读盘次数 a.SHARABLE_MEM,--占用shared pool的内存多少 a.BUFFER_GETS,--读取缓冲区的次数 a.COMMAND_TYPE,--命令类型(3:select,2:insert;6:update;7delete;47:pl/sql程序单元) a.SQL_TEXT,--Sql语句 a.SHARABLE_MEM, a.PERSISTENT_MEM, a.RUNTIME_MEM, a.PARSE_CALLS, a.DISK_READS, a.DIRECT_WRITES, a.CONCURRENCY_WAIT_TIME, a.USER_IO_WAIT_TIME from SYS.V_$SQLAREA a WHERE PARSING_SCHEMA_NAME = 'CHEA_FILL'--表空间 order by a.CPU_TIME desc 引用：http://jenniferok.iteye.com/blog/700985 从V$SQLAREA中查询最占用资源的查询 select b.username username,a.disk_reads reads, a.executions exec,a.disk_reads/decode(a.executions,1,a.executions) rds_exec_ratio, a.sql_text Statement from v$sqlarea a,dba_users b where a.parsing_user_id=b.user_id and a.disk_reads > 100000 order by a.disk_reads desc; 用buffer_gets列来替换disk_reads列可以得到占用最多内存的sql语句的相关信息。 v$sql：内存共享SQL区域中已经解析的SQL语句。（即时） 列出使用频率最高的5个查询： select sql_text,executions from (select sql_text, rank() over (order by executions desc) exec_rank from v$sql) where exec_rank <=5; 消耗磁盘读取最多的sql top5： select disk_reads,sql_text from (select sql_text, dense_rank() over (order by disk_reads desc) disk_reads_rank from v$sql) where disk_reads_rank <=5; 找出需要大量缓冲读取（逻辑读）操作的查询： select buffer_gets,buffer_gets, dense_rank() over (order by buffer_gets desc) buffer_gets_rank from v$sql) where buffer_gets_rank<=5; v$sqlarea字段定义：http://happyhou.blog.sohu.com/60494432.html