oracle索引管理脚本

oracle索引管理脚本

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--检测某一个索引使用的情况
select to_char(sn.begin_interval_time, 'yyyy-mm-dd hh24') c1,
       p.search_columns c2,
       count(*) c3
  from dba_hist_snapshot sn, dba_hist_sql_plan p, dba_hist_sqlstat st
 where st.sql_id = p.sql_id
   and sn.snap_id = st.snap_id
   and p.object_name = '&idxname'
 group by sn.begin_interval_time, p.search_columns;
 
 --需要重建的索引
 declare
  c_name         int;
  ignore         int;
  heights        index_stats.height%type := 0;
  lf_rowss       index_stats.lf_rows%type := 0;
  del_lf_rowss   index_stats.del_lf_rows%type := 0;
  distinct_keyss index_stats.distinct_keys%type := 0;
  cursor c_indx is
    select owner, table_name, index_name
      from dba_indexes
     where owner like upper('&schema')
       and owner not in ('SYS', 'SYSTEM');
BEGIN
  dbms_output.enable(10000000);
  dbms_output.put_line('Owner index name %Deleted Entries Blevel Distinctiveness');
  dbms_output.put_line('-----------------------------------------------------');
  c_name := dbms_sql.open_cursor;
  for r_indx in c_indx loop
    dbms_sql.parse(c_name,
                   'analyze index ' || r_indx.owner || '.' ||
                   r_indx.index_name || ' validate structure',
                   dbms_sql.native);
    ignore := dbms_sql.execute(c_name);
 
    select height,
           decode(lf_rows, 0, 1, lf_rows) lf_rows_status,
           del_lf_rows,
           decode(distinct_keys, 0, 1, distinct_keys) dis_keys_status
      into heights, lf_rowss, del_lf_rowss, distinct_keyss
      from index_stats;
 
    if (heights > 5) or ((del_lf_rowss / lf_rowss) > 0.2) then
      dbms_output.put_line(rpad(r_indx.owner, 16, ' ') ||
                           rpad(r_indx.index_name, 40, ' ') ||
                           lpad(round((del_lf_rowss / lf_rowss) * 100, 3),
                                17,
                                ' ') || lpad(heights - 1, 7, '        ') ||
                           lpad(round((lf_rowss - distinct_keyss) * 100 /
                                      lf_rowss,
                                      3),
                                16,
                                ' '));
    end if;
 
  end loop;
  dbms_sql.close_cursor(c_name);
END;