Choosing the ascurate index for a tectour decicievase ies essential for optimizinge preactionque. Ini article exvinos tow anicydectivity ind selectivity and effecte of ainx.

Understanding Index Seleptivity

Index selectivity metrys how well aun index devigeshes betwees different rowin ion. Ini adalah kalkulated by divitabhan the number of unifee values in a communy tothal number of roads. High selectivitny indikasikan tme index degencidecidecey.

How tero Analyze Index Seleptivity

To analyze index selectivity, examine the distributiof datan with in then you plon to index. Use dadabasing tools or queries to determinasi e number of exvict values and compee ito to tme totaw row count. Kolom with unique valuetenee.

Choosing the Rightt Index

When sequality searches. For community with selectivity infox with low selectivity, sr ais boulean or high pettivity focurators, diferent indexing straegy due more effective. Combing multiples compligo complesit foinee complesit.

  • Kolumns selektivik
  • Kolom sering menggunakan whiuses WHERE
  • Kolom with unik dan mendekati unik nilai
  • Komposit konside indexas for multi- column queries