• 如何查询Buffer Gets,Physical Reads


    Top 10 by Buffer Gets:

    set linesize 100
    set pagesize 100
    SELECT * FROM
    (SELECT substr(sql_text,1,40) sql,
           buffer_gets, executions, buffer_gets/executions "Gets/Exec",
           hash_value,address
    FROM V$SQLAREA
       WHERE buffer_gets > 10000
    ORDER BY buffer_gets DESC)
    WHERE rownum <= 10
    ;

    Top 10 by Physical Reads:

    set linesize 100
    set pagesize 100
    SELECT * FROM
    (SELECT substr(sql_text,1,40) sql,
           disk_reads, executions, disk_reads/executions "Reads/Exec",
           hash_value,address
    FROM V$SQLAREA
       WHERE disk_reads > 1000
    ORDER BY disk_reads DESC)
    WHERE rownum <= 10
    ;

    Top 10 by Executions:

    set linesize 100
    set pagesize 100
    SELECT * FROM
    (SELECT substr(sql_text,1,40) sql,
           executions, rows_processed, rows_processed/executions "Rows/Exec",
           hash_value,address
    FROM V$SQLAREA
       WHERE executions > 100
    ORDER BY executions DESC)
    WHERE rownum <= 10
    ;

    Top 10 by Parse Calls:

    set linesize 100
    set pagesize 100
    SELECT * FROM
    (SELECT substr(sql_text,1,40) sql,
           parse_calls, executions, hash_value,address
    FROM V$SQLAREA
       WHERE parse_calls > 1000
    ORDER BY parse_calls DESC)
    WHERE rownum <= 10
    ;

    Top 10 by Sharable Memory:

    set linesize 100
    set pagesize 100
    SELECT * FROM
    (SELECT substr(sql_text,1,40) sql,
           sharable_mem, executions, hash_value,address
    FROM V$SQLAREA
       WHERE sharable_mem > 1048576
    ORDER BY sharable_mem DESC)
    WHERE rownum <= 10
    ;

    Top 10 by Version Count:

    set linesize 100
    set pagesize 100
    SELECT * FROM
    (SELECT substr(sql_text,1,40) sql,
           version_count, executions, hash_value,address
    FROM V$SQLAREA
       WHERE version_count > 20
    ORDER BY version_count DESC)
    WHERE rownum <= 10

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  • 原文地址:https://www.cnblogs.com/HondaHsu/p/2642754.html
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