count(*) from DBA_HIST_SQLSTAT s, DBA_HIST_SNAPSHOT p, DBA_HIST_SQLTEXT t where 1=1 and s.SNAP_ID = p.SNAP_ID and s.SQL_ID = t.SQL_ID and EXTRACT(HOUR FROM p.END_INTERVAL_TIME) between 8 and 16 and t.COMMAND_TYPE != 47 –- Exclude PL/SQL blocks from output and p.E...
dba_hist_sqlstat是一个宝库,很多的sql执行统计信息都会在其中,可以基于这个数据字典分析很多的特性,比如查看某条sql语句的性能历史,分析执行计划是否稳定等等,这些功能在分析sql语句的时候是相当实用的,毕竟一个awr报告中的sql问题可能只是一个表象,如果结合历史来看就会分析出更多的因素来。 SQL> desc dba_hist_sqls...
2.根据sql_id,在dba_hist_sqltext中查看相关sql语句 select command_type,sql_text from dba_hist_sqltext where sql_id='d5bcqvumxr4y4'; command_type sql_text 3 select count(id) from bom 注:command_type=3表示这是select命令,完整的command_type可以select * from audit_actions; 3.查看之前命令的...
a.sql_id SQL编号FROMdba_hist_sqltext a, (SELECTsql_id, ELAPSED_TIME_DELTA/1000000ASetimeFROMdba_hist_sqlstatWHEREELAPSED_TIME_DELTA/1000000>=1) b, dba_hist_active_sess_history c, dba_users uWHEREa.sql_id=b.sql_idANDu.username='SYNC_PLUS_1_20190109'ANDc.user_id=u.user_idANDb.sql...
这个字段明显是Oracle中性能查询脚本字段 代表磁盘资源使用率
Sql代码 select table_name,owner from dba_tab_columns t where t.COLUMN_NAME like upper('%username%'); 2.2.oracle中查询某个表的列数 Sql代码 select count(*) from user_tab_columns where table_name= upper('sys_operate') 注:这两个例子都用到了upper这个函数,是因为在这里表名得大写,否则查出的...
from DBA_HIST_SQLSTAT s, DBA_HIST_SNAPSHOT p, DBA_HIST_SQLTEXT t where 1=1 and s.SNAP_ID = p.SNAP_ID and s.SQL_ID = t.SQL_ID and EXTRACT(HOUR FROM p.END_INTERVAL_TIME) between 8 and 16 and t.COMMAND_TYPE != 47 –- Exclude PL/SQL blocks from output and p.END...
可以根据sql_id使用v$sql或者dba_hist_sqlstat视图进行并行进程使用情况的查看。 4.定位问题原因 根据前面的查询步骤我们已经发现了问题:sql的并行出现了降级(8>4...经过第一篇文章《Oracle中的并行系列(一)》的介绍,我们对Oracle中的并行有了大致的了解。但是实际使用并行的过程中我们可能会遇到很多问题,比如可能还...
select b.username username,a.disk_reads reads,a.executions exec,a.disk_reads / decode(a.executions, 0, 1, a.executions) rds_exec_ratio,a.command_type,a.sql_text Statementfrom v$sqlarea a, dba_users bwhere a.parsing_user_id = b.user_idand a.disk_reads > 100000order by a.disk_read...
获取SQL的一个绑定变量: SELECT VALUE_STRING FROM v$sql_bind_capture WHERE sql_id ='6pkd06hdx99xk'; SELECT snap_id,NAME,position,value_string,last_captured,WAS_CAPTURED FROM dba_hist_sqlbind WHERE sql_id ='c1j018vt5ajdu'; select sql_id,sql_plan_line_id,sql_plan_hash_value,count(*)...