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I have 3 tables that they can be on 1table. What is the best performance for its design? I need a fast database on search and read, not on insert.

  1. These 3 tables will be read too more than be written
  2. These 3 tables have more than 5 millions records
  3. Most of the fields that are available in this table "p_apartmentbuy" are used in the search clause query (they have been indexed) And include some fields that are shown in the search result
  4. The fields in this table "p_apartmentbuydetail" aren't used in search clause
  5. "pf_contact" table will be used to show on some search result and usually some columns are null

And what is differences between a "keyname with several indexes" and "several keynames with one index for each one" (like attachment photo). enter image description here

Relations between tables:
       p_apartmentbuy.id = p_apartmentbuydetail.p_apartmentbuy_id (1:1)
       pf_contact.id = p_apartmentbuydetail.pf_contact_id (1:1)

    CREATE TABLE `p_apartmentbuy` (
      `id` mediumint(7) unsigned NOT NULL AUTO_INCREMENT,
      `dateadd` int(10) unsigned NOT NULL DEFAULT '0',
      `sqm` smallint(5) unsigned NOT NULL DEFAULT '0',
      `age` tinyint(2) unsigned NOT NULL DEFAULT '0',
      `price` bigint(12) unsigned NOT NULL DEFAULT '0',
      `pricemeter` int(10) unsigned NOT NULL DEFAULT '0',
      `bedroom` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `parking` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `storage` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `elevator` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `describe` varchar(255) COLLATE utf8_unicode_ci NOT NULL DEFAULT ' ',
      `featured` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `pf_source_id` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `l_location_id` smallint(5) unsigned NOT NULL DEFAULT '0',
      `l_city_id` smallint(4) unsigned NOT NULL DEFAULT '0',
      `l_province_id` tinyint(3) unsigned NOT NULL DEFAULT '0',
      `pf_status_id` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `pf_floor_id` tinyint(2) unsigned NOT NULL DEFAULT '0',
      `pf_facing_id` tinyint(2) unsigned NOT NULL DEFAULT '0',
      `pf_cabinet_id` tinyint(2) unsigned NOT NULL DEFAULT '0',
      `pf_service_id` tinyint(2) unsigned NOT NULL DEFAULT '0',
      PRIMARY KEY (`id`),
      KEY `dateadd` (`dateadd`),
      KEY `sqm` (`sqm`),
      KEY `age` (`age`),
      KEY `price` (`price`),
      KEY `bedroom` (`bedroom`),
      KEY `parking` (`parking`),
      KEY `storage` (`storage`),
      KEY `elevator` (`elevator`),
      KEY `l_location_id` (`l_location_id`),
      KEY `l_city_id` (`l_city_id`),
      KEY `l_province_id` (`l_province_id`),
      KEY `pricemeter` (`pricemeter`),
      FULLTEXT KEY `describe` (`describe`)
    ) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

    CREATE TABLE `pf_contact` (
      `id` mediumint(7) unsigned NOT NULL AUTO_INCREMENT,
      `name` varchar(30) COLLATE utf8_unicode_ci NOT NULL DEFAULT ' ',
      `mobile` bigint(20) unsigned NOT NULL DEFAULT '0',
      `telephone` bigint(20) NOT NULL DEFAULT '0',
      `telephone2` bigint(20) unsigned NOT NULL DEFAULT '0',
      PRIMARY KEY (`id`)
    ) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

    CREATE TABLE `p_apartmentbuydetail` (
      `p_apartmentbuy_id` mediumint(7) unsigned NOT NULL,
      `address` varchar(255) COLLATE utf8_unicode_ci NOT NULL DEFAULT ' ',
      `link` varchar(999) COLLATE utf8_unicode_ci NOT NULL DEFAULT ' ',
      `sqmland` smallint(5) unsigned NOT NULL DEFAULT '0',
      `floortotal` tinyint(3) unsigned NOT NULL DEFAULT '0',
      `floorno` tinyint(3) unsigned NOT NULL DEFAULT '0',
      `unitno` tinyint(3) unsigned NOT NULL DEFAULT '0',
      `unitperfloor` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `remotedoor` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `iphone` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `trase` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `sona` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `pool` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `jackosi` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `renovate` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `tel` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `water` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `gas` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `electricity` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `pf_kitchen_id` tinyint(1) unsigned NOT NULL DEFAULT '0',
      `pf_contact_id` mediumint(7) unsigned NOT NULL DEFAULT '0',
      `pf_temperaturesystem_id` tinyint(2) unsigned NOT NULL DEFAULT '0',
      `pf_position_id` tinyint(2) unsigned NOT NULL DEFAULT '0',
      `prev_id` smallint(8) unsigned NOT NULL DEFAULT '0',
      PRIMARY KEY (`p_apartmentbuy_id`),
      KEY `prev_id` (`prev_id`)
    ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
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