What does Reindexing a database mean?

How often should you reindex a database?

There's a general consensus that you should reorganize ("defragment") your indices as soon as index fragmentation reaches more than 5 (sometimes 10%), and you should rebuild them completely when it goes beyond 30% (at least that's the numbers I've heard advocated in a lot of places).

What is Reindexing in MySQL?

MySQL REINDEX denotes the re-indexing process to rebuild the indexes on a database if the database is corrupted or needs repair to optimize the tables and fetch the rows using indexes properly using phpMyAdmin.

How long does it take to reindex database?

This process took over 25 hours to complete and the database needed to be cut off from customer-facing applications during that time.

Do I need to reindex SQL Server?

Microsoft recommends fixing index fragmentation issues by rebuilding the index if the fragmentation percentage of the index exceeds 30%, where it recommends fixing the index fragmentation issue by reorganizing the index if the index fragmentation percentage exceeds 5% and less than 30%.