Whenever a database is corrupted or needs a repair, then there will be a need to use theREINDEXto rebuild the indexes or repair the database or the table. Most of the indexes of MySQL, including thePRIMARY KEY,UNIQUE,INDEX,FULLTEXT&REINDEX, are stored in the B-trees, which are self-...
1 How to delete Index? 1 How to drop an index called 'index' from MySQL? 5 Drop index query is slow 16 How to make DROP INDEX IF EXISTS for mysql? 2 MySQL drop unique index 0 Duplicated index in MySql table 4 Mysql table index length not reducing after drop them Hot Network ...
If you place status first in the index and then name, you will be creating a index that would "group" all of your 'ACTIVE' names. That way when you query against the table, the optimizer would know exactly where in the index to start looking for the name you're querying against. Sha...
4 MySQL ORDER BY columns across multiple joined tables 0 Index for date column along with multiple other columns in where clause 1 Handle 4 tables and to show 4 columns as result 5 MySQL uses INDEX for optimizing ORDER BY with GROUP BY except when you add a JOIN 0 Slow quer...
http://dev.mysql.com/doc/refman/5.0/en/multiple-column-indexes.html It short of helps, but still unclear which is better, doing an index on every distinct column you use for where clauses or trying to combine columns into one index. Furthermore, how do you know which columns you should...
I am utilizing the 'Talipp' library in Python to compute diverse moving averages, such as ALMA, DEMA, EMA, HMA, KAMA, SMA, SMMA, T3, TEMA, WMA, and ZLEMA. Subsequently, I aim to store these calculated values in a MySQL database with columns 'name', 'date', 'open', 'high', ...
In reply to a question about how to conditionally drop an index on a table in MySQL. It appears the syntax doesn’t exist. However, maybe it does and I missed it. If I did miss it, I’m sure somebody will let me know. However, I simply have adropIndexIfExistsstored procedure for...
Indexes are used to find rows with specific column values quickly. Without an index, MySQL must begin with the first row and then read through the entire table to find the relevant rows. The larger the table, the more this costs. If the table has an index for the columns in question, ...
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While adding a GIN index on the JSON columns is not allowed in MySQL, you can define a virtual column and add an index to it. However, you need to make sure that the JSON attribute you’re using for indexing is highly selective, as otherwise, the index might not be used by the data...