Oracle 数据库 DBMS_SQLTUNE调优

Oracle 数据库阿木 发布于 19 天前 5 次阅读

摘要：

随着数据库规模的不断扩大和业务需求的日益增长，数据库性能调优成为数据库管理员(DBA)和开发人员关注的焦点。Oracle数据库提供了丰富的工具和功能来帮助用户进行性能调优，其中DBMS_SQLTUNE是Oracle数据库中一个强大的SQL调优工具。本文将围绕DBMS_SQLTUNE进行深入解析，探讨其原理、使用方法以及在实际应用中的技巧。

一、

DBMS_SQLTUNE是Oracle数据库中一个用于自动生成SQL调优建议的包，它可以帮助用户识别性能瓶颈，并提供相应的优化建议。DBMS_SQLTUNE通过分析SQL执行计划、执行统计信息以及数据库配置参数，自动生成SQL调优建议，从而提高数据库性能。

二、DBMS_SQLTUNE原理

DBMS_SQLTUNE的核心原理是利用SQL执行计划、执行统计信息和数据库配置参数来评估SQL语句的性能。具体来说，它包括以下几个步骤：

1. 收集SQL执行计划：DBMS_SQLTUNE首先收集SQL语句的执行计划，包括查询块、操作符、成本等。

2. 分析执行统计信息：DBMS_SQLTUNE分析SQL语句的执行统计信息，如执行次数、平均执行时间、CPU消耗等。

3. 评估数据库配置参数：DBMS_SQLTUNE评估数据库配置参数，如内存分配、并行度等，以确定其对SQL性能的影响。

4. 生成调优建议：根据以上分析结果，DBMS_SQLTUNE生成SQL调优建议，包括索引创建、统计信息更新、SQL重写等。

三、DBMS_SQLTUNE使用方法

1. 创建SQL Tuning Set

需要创建一个SQL Tuning Set（简称Tuning Set），它是DBMS_SQLTUNE进行调优的基础。以下是一个创建Tuning Set的示例代码：

sql
BEGIN

  DBMS_SQLTUNE.CREATE_TUNING_SET(

    name => 'my_tuning_set',

    description => 'Tuning Set for SQL Performance',

    workarea_size => 1000,

    sql_text => NULL,

    sql_id => NULL,

    bind_variable => NULL,

    time_limit => 3600,

    cpu_time_limit => 3600,

    io_cost_limit => 3600,

    memory_limit => 1000,

    parallel => FALSE,

    auto_create_index => FALSE,

    auto_create_stat => FALSE,

    auto_create_plan => FALSE,

    auto_create_sql_profile => FALSE,

    auto_create_sql_plan Baseline => FALSE,

    auto_create_sql_plan Baseline => FALSE,

    auto_create_sql_profile => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE,

    auto_create_sql_profile Baseline => FALSE

  );

END;

2. 生成SQL调优建议

创建Tuning Set后，可以使用以下代码生成SQL调优建议：

```sql

BEGIN

DBMS_SQLTUNE.CREATE_SQL_TUNING_ADVICE(

name => 'my_tuning_advice',

tuning_set_name => 'my_tuning_set',

advice_type => 'ALL',

sql_text => NULL,

sql_id => NULL,

bind_variable => NULL,

time_limit => 3600,

cpu_time_limit => 3600,

io_cost_limit => 3600,

memory_limit => 1000,

parallel => FALSE,

auto_create_index => FALSE,

auto_create_stat => FALSE,

auto_create_plan => FALSE,

auto_create_sql_profile => FALSE,

auto_create_sql_plan Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql_profile Baseline => FALSE,

auto_create_sql