Question

我需要在存储过程中改进此查询，大量数据的性能打破了应用程序。有没有办法让它更快？

我需要从几个表中收集某些列以在我的应用程序Web中构建仪表板，其他列我在其他查询中收集并通过类加入我的控制器。

编辑：此查询是动态事务的一部分，它们可以更改数据库。

SELECT 
    a.fact_num as cotizacion, a.comentario, m.co_cli, k.cli_des, 
    m.co_ven, l.ven_des, m.fec_emis, m.fec_venc, m.campo8, 
    a.reng_num, a.co_art, g.art_des, a.co_alma, b.fact_num as pedido, 
    c.fact_num as factura, d.fact_num as despacho, e.cob_num as cobro, 
    f.fec_venc as fecha_venc, f.fec_emis as fecha_pedido,
    h.odp_num as ord_produccion, h.co_ced as cedula, i.req_num as requisicion, 
    j.ent_num as cierre 
FROM 
    reng_cac a
LEFT JOIN  
    cotiz_c m ON a.fact_num = m.fact_num
LEFT JOIN 
    reng_ped b ON a.co_art = b.co_art AND a.fact_num = b.num_doc AND b.tipo_doc = 'T'
LEFT JOIN 
    pedidos f ON b.fact_num = f.fact_num 
LEFT JOIN 
    reng_fac c ON b.fact_num = c.num_doc AND a.co_art = c.co_art AND c.tipo_doc = 'P'
LEFT JOIN 
    reng_ndd d ON c.fact_num = d.num_doc AND a.co_art = d.co_art AND d.tipo_doc = 'F'
LEFT JOIN 
    reng_cob e ON c.fact_num = e.doc_num AND e.tp_doc_cob = 'FACT'
LEFT JOIN 
    art g ON a.co_art = g.co_art
LEFT JOIN 
    spodp h ON b.fact_num = h.doc_ori AND b.co_art = h.co_art 
LEFT JOIN 
    spreqalm i ON h.odp_num = i.odp_num
LEFT JOIN 
    spcierre j ON h.odp_num = j.odp_num 
LEFT JOIN 
    clientes k ON m.co_cli = k.co_cli
LEFT JOIN 
    vendedor l ON m.co_ven = l.co_ven
WHERE 
    a.fact_num BETWEEN '0' AND '999999999' 
    AND m.fec_emis BETWEEN '01/01/2012' AND '30/06/2012'
    AND m.co_cli BETWEEN '' AND 'þþþþþþþþþþþþþþþþþþþþþþþþþþþþþþ' 
ORDER BY 
    a.fact_num, a.reng_num ASC

Answer 1

正如尼克评论的那样，您始终需要在执行计划中运行查询。您需要考虑一些问题。例如，拥有大量LEFT JOIN s会降低性能。试着看看你是否可以尽可能使用INNER JOIN。检查您是否有适当的索引。如果您可以将执行计划附加到您的问题中，您将获得更多有用的答案。

改进存储过程中的查询

1 个答案: