Are these WordPress tables safe to add indexes to?

These tables aren’t indexed

These tables are indexed

For example, the post meta table has these indexes:

https://codex.wordpress.org/Database_Description#Indexes_5

You’re more likely to cause issues or reduce performance through bad indexing by adding new indexes. WP already specifies indexes for tables

“dbmain” “wp_mf_post_meta” “post_id” “Not indexed”
“dbmain” “wp_mf_custom_fields” “custom_group_id” “Not indexed”

Those are not WordPress tables, you need to ask the plugin authors.

What I think has happened here is that you’ve used a mystery tool that has given you output that has been misinterpreted.

Notice how it does not say “No Index”, it says Not indexed. It never claims an index is missing. Also notice that wp_comments is listed multiple times. It’s more likely that it’s showing you indexes that already exist, not tables.

Related Posts:

  1. Column count doesn’t match value count at row 1
  2. ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)
  3. MySQL string replace
  4. MySQL error 2006: mysql server has gone away
  5. ERROR 2003 (HY000): Can’t connect to MySQL server on localhost (10061)
  6. “INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
  7. Cannot delete or update a parent row: a foreign key constraint fails
  8. #1273 – Unknown collation: ‘utf8mb4_unicode_520_ci’
  9. What is the definition of cardinality in SQL
  10. How to restart remote MySQL server running on Ubuntu linux?
  11. Host ‘xxx.xx.xxx.xxx’ is not allowed to connect to this MySQL server
  12. what does “/index.php?admin/admin_dashboard” in my url mean
  13. How to join two tables by multiple columns in SQL?
  14. How to get size of mysql database?
  15. SQL – Update multiple records in one query
  16. Difference between VARCHAR and TEXT in MySQL
  17. MySQL Error 1093 – Can’t specify target table for update in FROM clause
  18. MySQL: Invalid use of group function
  19. mysqladmin: connect to server at ‘localhost’ failed
  20. mysql update multiple columns with same now()
  21. Usage of MySQL’s “IF EXISTS”
  22. Simple Random Samples from a Sql database
  23. What does SQL clause “GROUP BY 1” mean?
  24. LAST_INSERT_ID() MySQL
  25. Generating a random & unique 8 character string using MySQL
  26. MySQL > Table doesn’t exist. But it does (or it should)
  27. SQL select only rows with max value on a column
  28. Trying to perform MINUS operation in MySQL
  29. How do I find which transaction is causing a “Waiting for table metadata lock” state?
  30. Getting java.sql.SQLException: Operation not allowed after ResultSet closed
  31. How to create a foreign key in phpmyadmin
  32. Can’t create test file lower test start server mysql
  33. MySQL delete multiple rows in one query conditions unique to each row
  34. SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known
  35. Is there a naming convention for MySQL?
  36. CAST to DECIMAL in MySQL
  37. Failed to Connect to MySQL at localhost:3306 with user root
  38. How do you properly prepare a %LIKE% SQL statement?
  39. Set page template for all pages?
  40. Optimize Multiple Taxonomy Term MySQL Query?
  41. What specific database privileges does WordPress need?
  42. Using source control with WordPress
  43. SQL query to update post_date (one post = one single date & time)
  44. My WordPress site always displays a cached version of its homepage
  45. How to copy post titles to post slug in phpmyadmin
  46. If I consider changing my WordPress DB tables to InnoDB, will it have an effect on the way WordPress works?
  47. Proper way to work with wpdb to get user’s firstname
  48. How to change post format from Aside to Image for all posts?
  49. How to add and SQL query of posts only published
  50. Slow Mysql Queries
  51. Database: Custom table: sprintf value for DateTime column
  52. What is the most secure way to set up the MySQL user in WPMU?
  53. Find duplicate posts with same slug and author
  54. WP_USE_EXT_MYSQL
  55. writing inner join in wpdb
  56. Distinction on meta value on pre_get_posts
  57. MySQL Rank & $wpdb
  58. When WordPress Default table, Echo Success. When Plugin Table, Echo Blank
  59. WordPress post_status is future, manually added
  60. How are multiple WordPress WPDB queries handled?
  61. Regarding “Insert query error” in wordpress
  62. MySQL 5.5 upgrade ‘broke’ WordPress [closed]
  63. WordPress plugin overloading with tmp tables
  64. Site not responding error – taking long to load [closed]
  65. WordPress(wpdb class) and mysql stored procedures
  66. Update MySQL query so that it functions again
  67. Is there a page length limit?
  68. Query posts by custom taxonomy and sort by post_modified
  69. WordPress $wpdb get posts from category and sort by custom meta
  70. Create a form with custom autocomplete address field and CSV import values
  71. WordPress insert query is not working : Showing no Error
  72. Some Post Content Does Not Show Up In DB Search
  73. Array Formation Issue
  74. Migration problems with mysql: Operation not allowed when innodb_forced_recovery > 0 [closed]
  75. WordPress $wpdb no result
  76. How can I view my site directly from WordPress dashboard?
  77. (WP List Table) How to sort by SKU and Custom Fields?
  78. User set date and time from frontend doesn’t get stored into database
  79. get posts whether meta_key exists or not
  80. when using $wpdb sudden connection rejection without changing anything. Access denied, with errors from repair tool
  81. How to bulk delete a certain part of all wordpress posts
  82. When I add metadata, metavalue length is added in to the value in some cases
  83. edit_user_created_user hook – using to update Groups
  84. Mysql Error in querying form entries in Gravity Form plugin
  85. update_option returns false in AJAX, how to debug?
  86. WordPress database error Duplicate entry for key ‘slug’
  87. Improving performance of SQL sub-queries in WordPress
  88. Saving custom term value to the database in new table
  89. MySQL errors after a WordPress clone
  90. `#1215 – Cannot add foreign key constraint
  91. How to restore: Database intact but folders deleted
  92. XML RPC post produces immediate revision with odd post_date_gmt
  93. MYSQL Join on meta key value?
  94. Complicated MySQL Query
  95. problem with quotes on new post
  96. Is there an equivalent of MySQL’s SHOW CREATE TABLE in Postgres?
  97. Why does the MySQL command line tool ignore the –port parameter?
  98. How can I show user’s privileges in MySQL?
  99. Postgres equivalent to MySQL’s \G?
  100. Possible SQL injection. How to locate and fix?
techhipbettruvabetnorabahisbahis forumutaraftarium24edueduedusedueduedusedusedusedusedu