However, certain workloads that are sensitive to widely varying data distributions may require an increased sample size, or even a full scan. Cuando es OFF, el porcentaje de muestreo de estadÃsticas se restablece al muestreo predeterminado en actualizaciones posteriores que no especifiquen explÃcitamente un porcentaje de muestreo.When OFF, statistics sampling percentage will get reset to default sampling in subsequent updates that do not explicitly specify a sampling percentage. Puede actualizar las estadÃsticas de optimización de consultas en una tabla o en una vista indizada de, You can update query optimization statistics on a table or indexed view in, De forma predeterminada, el optimizador de consultas ya actualiza las estadÃsticas como requisito para mejorar el plan de consulta; en algunos casos puede mejorar el rendimiento de las consultas utilizando UPDATE STATISTICS o el procedimiento almacenado, By default, the query optimizer already updates statistics as necessary to improve the query plan; in some cases you can improve query performance by using UPDATE STATISTICS or the stored procedure. El porcentaje o número de filas real de los ejemplos del optimizador de consultas podrÃa no coincidir con el porcentaje o el número especificado. Pero para ciertas cargas de trabajo que son sensibles a distribuciones de datos muy diferentes, puede que sea necesario un tamaño de muestreo mayor o incluso un examen completo.However, certain workloads that are sensitive to widely varying data distributions may require an increased sample size, or even a full scan. Para rehabilitar el comportamiento de la opción AUTO_UPDATE_STATISTICS, ejecute de nuevo UPDATE STATISTICS sin la opción NORECOMPUTE o ejecute sp_autostats.To re-enable the AUTO_UPDATE_STATISTICS option behavior, run UPDATE STATISTICS again without the NORECOMPUTE option or run sp_autostats. For example, the query optimizer scans all rows on a data page. Este procedimiento elige automáticamente si se debe volver a generar o reorganizar un Ãndice según su nivel de fragmentación, entre otros parámetros y actualiza las estadÃsticas con un umbral lineal.This procedure automatically chooses whether to rebuild or reorganize an index according to its fragmentation level, amongst other parameters, and update statistics with a linear threshold. Utilice MAXDOP para establecer un lÃmite para el número de procesadores utilizados en la ejecución de un plan paralelo. Cuando no se especifica SAMPLE ni FULLSCAN, el optimizador de consultas utiliza los datos muestreados y calcula el tamaño de la muestra de forma predeterminada.When neither SAMPLE nor FULLSCAN is specified, the query optimizer uses sampled data and computes the sample size by default. sql server update statistics all databases. La actualización de las estadÃsticas asegura que las consultas se compilan con estadÃsticas actualizadas. Actualice todas las estadÃsticas existentes, las estadÃsticas creadas en una o más columnas, o las estadÃsticas creadas para los Ãndices. The actual percentage or number of rows the query optimizer samples might not match the percentage or number specified. Using this option can produce suboptimal query plans. To update a specific statistics object In Object Explorer, connect to an instance of Database Engine. PERSIST_SAMPLE_PERCENT = { ON | OFF }PERSIST_SAMPLE_PERCENT = { ON | OFF }
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