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  • oracle--索引

    索引碎片整理实例

     

     

    select * from user_indexes;
    
    select * from user_ind_columns;
    
    --建立表、索引:
    create table t (id int);
    create index ind_1 on t(id);
    执行插入记录:
    begin
      for i in 1..1000000 loop 
        insert into t values (i);
        if mod(i, 100)=0 then commit;
        end if;
      end loop;
    end;
    --分析索引:
    analyze index ind_1 validate structure;
    select name,HEIGHT,PCT_USED,DEL_LF_ROWS/LF_ROWS from index_stats;
    delete t where rownum<700000;
    alter index ind_1 rebuild [online] [tablespace name];
    
    --实例:
    select count(*) from t;
    select name,HEIGHT,PCT_USED,DEL_LF_ROWS/LF_ROWS from index_stats;
    analyze index ind_1 validate structure;
    select name,HEIGHT,PCT_USED,DEL_LF_ROWS/LF_ROWS from index_stats;
    delete t where rownum < 700000;
    commit;
    select name,HEIGHT,PCT_USED,DEL_LF_ROWS/LF_ROWS from index_stats;
    analyze index ind_1 validate structure;
    select name,HEIGHT,PCT_USED,DEL_LF_ROWS/LF_ROWS from index_stats;
    alter index ind_1 rebuild online ;--[tablespace name]
    select name,HEIGHT,PCT_USED,DEL_LF_ROWS/LF_ROWS from index_stats;
    analyze index ind_1 validate structure;
    select name,HEIGHT,PCT_USED,DEL_LF_ROWS/LF_ROWS from index_stats;
    

      

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  • 原文地址:https://www.cnblogs.com/eadela/p/11562136.html
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