本人常用SQL

1,索引：

    exec dbms_stats.gather_table_stats(ownname=>'ETL',tabname=>'f_p10ids_classcode_l');

    analyze index index1 validate structure：

    analyze index index1 compute statistics：

 

 2, 谓词上移 & 谓词下推 predicate push

    相关文章 :

   a, http://wenku.baidu.com/view/4702ae1aff00bed5b9f31ddc.html

   b, http://blog.nominet.org.uk/tech/2006/01/31/view-predicate-pushing/

   c , http://www.easyora.net/blog/push_predicate_sql_tuning.html

   d, http://blogs.oracle.com/optimizer/2011/01/basics_of_join_predicate_pushdown_in_oracle.html

   e, CBO hint:no_unnest,push_subq,push_pred的用法 http://www.itpub.net/viewthread.php?tid=1308385

 

 3, table join : 

     key: SEMI

4,分析函数:

 select address
       ,disk_reads
       ,executions
       ,100 * ratio_to_report(disk_reads) over() pct
   from sys.v_$sql
  where command_type != 47
    and parsing_schema_name = 'CCFRAME_APP'
  order by disk_reads desc ;

5 ,使用如下语句，查出此时，系统消耗多的SQL

  -- ETL 
  drop table temp_v$sql ;
  
  create table temp_v$sql (
    SQL_ID            VARCHAR2(30),
    SQL_TEXT          VARCHAR2(1000),
    EXECUTIONS        VARCHAR2(30),
    PARSE_CALLS       VARCHAR2(30),
    DISK_READS        VARCHAR2(30),
    BUFFER_GETS       VARCHAR2(30),
    USER_IO_WAIT_TIME VARCHAR2(30),
    ROWS_PROCESSED    VARCHAR2(30),
    CPU_TIME          VARCHAR2(30),
    ELAPSED_TIME      VARCHAR2(30),
    TYPE              VARCHAR2(30),
    DTTM              DATE
  ) ;
  
  grant select,insert,update,delete on temp_v$sql to ccframe_app ;
  
  -- CCFRAME
  delete from etl.temp_v$sql ;
  COMMIT;
  
  insert into etl.temp_v$sql
    select SQL_ID
          ,MAX(SQL_TEXT) SQL_TEXT
          ,sum(EXECUTIONS) EXECUTIONS
          ,sum(PARSE_CALLS) PARSE_CALLS
          ,sum(DISK_READS) DISK_READS
          ,sum(BUFFER_GETS) BUFFER_GETS
          ,sum(USER_IO_WAIT_TIME) USER_IO_WAIT_TIME
          ,sum(ROWS_PROCESSED) ROWS_PROCESSED
          ,sum(CPU_TIME) CPU_TIME
          ,sum(ELAPSED_TIME) ELAPSED_TIME
          ,'before'
          ,sysdate
      from sys.v_$sql
     where command_type != 47
       and parsing_schema_name = 'CCFRAME_APP' group by SQL_ID ;
  commit;
  
  insert into etl.temp_v$sql
    select SQL_ID
          ,MAX(SQL_TEXT) SQL_TEXT
          ,sum(EXECUTIONS) EXECUTIONS
          ,sum(PARSE_CALLS) PARSE_CALLS
          ,sum(DISK_READS) DISK_READS
          ,sum(BUFFER_GETS) BUFFER_GETS
          ,sum(USER_IO_WAIT_TIME) USER_IO_WAIT_TIME
          ,sum(ROWS_PROCESSED) ROWS_PROCESSED
          ,sum(CPU_TIME) CPU_TIME
          ,sum(ELAPSED_TIME) ELAPSED_TIME
          ,'after'
          ,sysdate
      from sys.v_$sql
     where command_type != 47
       and parsing_schema_name = 'CCFRAME_APP' group by SQL_ID ;
  commit;

  select *
    from (select bef.sql_id
                ,bef.SQL_TEXT
                ,aft.executions - bef.executions executions
                ,trunc((100 * ratio_to_report(aft.executions - bef.executions) over()),2) pct_executions
                ,aft.parse_calls - bef.parse_calls parse_calls
                ,trunc((100 * ratio_to_report(aft.parse_calls - bef.parse_calls) over()),2) pct_parse_calls
                ,aft.disk_reads - bef.disk_reads disk_reads
                ,trunc((100 * ratio_to_report(aft.disk_reads - bef.disk_reads) over()),2) pct_disk_reads
                ,aft.buffer_gets - bef.buffer_gets buffer_gets
                ,trunc((100 * ratio_to_report(aft.buffer_gets - bef.buffer_gets) over()),2) pct_buffer_gets
                ,aft.user_io_wait_time - bef.user_io_wait_time user_io_wait_time
                ,trunc((100 * ratio_to_report(aft.user_io_wait_time - bef.user_io_wait_time) over()),2) pct_io_wait_time
                ,aft.rows_processed - bef.rows_processed rows_processed
                ,trunc((100 * ratio_to_report(aft.rows_processed - bef.rows_processed) over()),2) pct_rows_processed
                ,aft.cpu_time - bef.cpu_time cpu_time
                ,trunc((100 * ratio_to_report(aft.cpu_time - bef.cpu_time) over()),2) pct_cpu_time
                ,aft.elapsed_time - bef.elapsed_time elapsed_time
                ,trunc((100 * ratio_to_report(aft.elapsed_time - bef.elapsed_time) over()),2) pct_elapsed_time
            from etl.temp_v$sql bef, etl.temp_v$sql aft
           where bef.sql_id = aft.sql_id
             and bef.type = 'before'
             and aft.type = 'after') tt 
   order by elapsed_time desc;  --SQL ordered by Elapsed Time
   order by cpu_time desc;  --SQL ordered by CPU Time
   order by buffer_gets desc ;-- SQL ordered by Gets
   order by disk_reads desc ; -- SQL ordered by Reads
   order by executions desc ; -- SQL ordered by Executions
   order by parse_calls desc; --SQL ordered by Parse Calls 

6 常用AIX命令：

    ls | awk '{print "du -sm "$1}' | sh