I understand that there are probably hundreds of questions here addressing this issue but I haven't really found anything that worked yet.
The Scenario
I built a site on our staging site using Wordpress. Wordpress now uses utf8mb4 in the newer installations. Knowing this I checked the MySQL version on the live site to ensure compatibility and noticed it was using MySQL version 5.1.x.
I upgraded mysql on the live site following this tutorial with zero problems: https://kb.plesk.com/en/125589
At this point I do an export of the staging site database, replace all the staging site urls to the new live site urls and then import. Site runs fine until I see some diamond characters with question marks in them. I believe there is some character encoding issue at this point.
Just in case it wasn't a bad export I imported it locally on a MySQL version 5.5.3 on OSX. The import works fine. No character encoding issue.
I could be wrong but it might be treating the uft8mb4 encoding as utf8 on the live site.
Question(s)
If the export is working on my localhost with a similar MySQL version what could be causing the database on the live site to be spitting out missing characters?
Additional Info
Live Site MySQL version and status (encoding issues with import)
mysql Ver 14.14 Distrib 5.5.52, for Linux (x86_64) using readline 5.1
Connection id: 20682
Current database:
Current user: admin@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.5.52-cll-lve MySQL Community Server (GPL) by Atomicorp
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /var/lib/mysql/mysql.sock
Uptime: 16 hours 11 min 18 sec
Local mysql version and status (imports fine)
mysql Ver 14.14 Distrib 5.5.33, for osx10.6 (i386) using EditLine wrapper
Connection id: 4402
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.5.33 Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /Applications/MAMP/tmp/mysql/mysql.sock
Uptime: 14 days 8 hours 3 min 6 sec
Staging mysql version and status (Export source; site works fine)
VERSION is 5.5.5 (I couldn't get the status info of this one)
SQL dump file (a few tables only with some settings)
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
DROP TABLE IF EXISTS `wp_blc_filters`;
CREATE TABLE `wp_blc_instances` (
`instance_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`link_id` int(10) unsigned NOT NULL,
`container_id` int(10) unsigned NOT NULL,
`container_type` varchar(40) NOT NULL DEFAULT 'post',
`link_text` varchar(250) NOT NULL DEFAULT '',
`parser_type` varchar(40) NOT NULL DEFAULT 'link',
`container_field` varchar(250) NOT NULL DEFAULT '',
`link_context` varchar(250) NOT NULL DEFAULT '',
`raw_url` text NOT NULL,
PRIMARY KEY (`instance_id`),
KEY `link_id` (`link_id`),
KEY `source_id` (`container_type`,`container_id`),
KEY `parser_type` (`parser_type`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `wp_postmeta`;
CREATE TABLE `wp_postmeta` (
`meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`post_id` bigint(20) unsigned NOT NULL DEFAULT '0',
`meta_key` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`meta_value` longtext COLLATE utf8mb4_unicode_ci,
PRIMARY KEY (`meta_id`),
KEY `post_id` (`post_id`),
KEY `meta_key` (`meta_key`(191))
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
Output of SHOW FULL COLUMNS FROM wp_posts;
ID bigint(20) NULL
post_author bigint(20) NULL
post_date datetime NULL
post_date_gmt datetime NULL
post_content longtext utf8mb4_unicode_ci
post_title mediumtext utf8mb4_unicode_ci
post_excerpt mediumtext utf8mb4_unicode_ci
post_status varchar(20) utf8mb4_unicode_ci
comment_status varchar(20) utf8mb4_unicode_ci
ping_status varchar(20) utf8mb4_unicode_ci
post_password varchar(20) utf8mb4_unicode_ci
post_name varchar(200) utf8mb4_unicode_ci
to_ping mediumtext utf8mb4_unicode_ci
pinged mediumtext utf8mb4_unicode_ci
post_modified datetime NULL
post_modified_gmt datetime NULL
post_content_filtered longtext utf8mb4_unicode_ci
post_parent bigint(20) NULL
guid varchar(255) utf8mb4_unicode_ci
menu_order int(11) NULL
post_type varchar(20) utf8mb4_unicode_ci
post_mime_type varchar(100) utf8mb4_unicode_ci
comment_count bigint(20) NULL
I found some info that was different between the mysql servers when I ran the query SHOW VARIABLES LIKE 'char%'. Here are the results below if this helps distinguish the problem.
Local mysql
character_set_client utf8
character_set_connection utf8
character_set_database utf8
character_set_filesystem binary
character_set_results utf8
character_set_server latin1
character_set_system utf8
Staging mysql
character_set_client utf8
character_set_connection utf8
character_set_database latin1
character_set_filesystem binary
character_set_results utf8
character_set_server latin1
character_set_system utf8
Live mysql (remember this is the one having issues)
character_set_client utf8mb4
character_set_connection utf8mb4
character_set_database utf8mb4
character_set_filesystem binary
character_set_results utf8mb4
character_set_server latin1
character_set_system utf8
This is the diff of the SHOW VARIABLES command in mysql for my live and local environments
Local Environment
-| basedir | /Applications/MAMP/Library |
-| character_sets_dir | /Applications/MAMP/Library/share/charsets/ |
-| datadir | /Applications/MAMP/db/mysql/ |
-| general_log_file | /Applications/MAMP/db/mysql/Joes-Mac.log |
-| have_openssl | NO |
-| have_ssl | NO |
-| have_symlink | YES |
-| hostname | Joes-Mac.local |
-| innodb_additional_mem_pool_size | 8388608 |
-| innodb_buffer_pool_size | 134217728 |
-| innodb_log_buffer_size | 8388608 |
-| innodb_thread_concurrency | 0 |
-| innodb_use_native_aio | OFF |
-| innodb_version | 5.5.33 |
-| lc_messages_dir | /Applications/MAMP/Library/share/ |
-| local_infile | ON |
-| log_error | /Applications/MAMP/logs/mysql_error_log.err |
-| lower_case_file_system | ON |
-| lower_case_table_names | 2 |
-| open_files_limit | 2560 |
-| pid_file | /Applications/MAMP/tmp/mysql/mysql.pid |
-| plugin_dir | /Applications/MAMP/Library/lib/plugin/ |
-| port | 8889 |
-| pseudo_thread_id | 4465 |
-| report_port | 8889 |
-| slave_load_tmpdir | /var/folders/bj/t8j_n5qx3s1cgsq9c2_7nw4w0000gq/T/ |
-| slow_query_log_file | /Applications/MAMP/db/mysql/Joes-Mac-slow.log |
-| socket | /Applications/MAMP/tmp/mysql/mysql.sock |
-| system_time_zone | PDT |
-| timestamp | 1477524853 |
-| tmpdir | /var/folders/bj/t8j_n5qx3s1cgsq9c2_7nw4w0000gq/T/ |
-| version | 5.5.33 |
-| version_comment | Source distribution |
-| version_compile_machine | i386 |
-| version_compile_os | osx10.6 |
Live Environment
+| basedir | /usr |
+| character_sets_dir | /usr/share/mysql/charsets/ |
+| datadir | /var/lib/mysql/ |
+| general_log_file | /var/lib/mysql/vps-1003610-982.log |
+| have_openssl | DISABLED |
+| have_ssl | DISABLED |
+| have_symlink | DISABLED |
+| hostname | vps-1003610-982.clients.robsoninc.com |
+| innodb_additional_mem_pool_size | 524288 |
+| innodb_buffer_pool_size | 5242880 |
+| innodb_log_buffer_size | 512000 |
+| innodb_thread_concurrency | 2 |
+| innodb_use_native_aio | ON |
+| innodb_version | 5.5.52 |
+| lc_messages_dir | /usr/share/mysql/ |
+| local_infile | OFF |
+| log_error | /var/log/mysqld.log |
+| lower_case_file_system | OFF |
+| lower_case_table_names | 0 |
+| open_files_limit | 1024 |
+| pid_file | /var/run/mysqld/mysqld.pid |
+| plugin_dir | /usr/lib64/mysql/plugin/ |
+| port | 3306 |
+| pseudo_thread_id | 29088 |
+| report_port | 3306 |
+| slave_load_tmpdir | /tmp |
+| slow_query_log_file | /var/lib/mysql/vps-1003610-982-slow.log |
+| socket | /var/lib/mysql/mysql.sock |
+| system_time_zone | MSD |
+| thread_statistics | OFF |
+| timestamp | 1477524780 |
+| tmpdir | /tmp |
+| userstat | OFF |
+| version | 5.5.52-cll-lve |
+| version_comment | MySQL Community Server (GPL) by Atomicorp |
+| version_compile_machine | x86_64 |
+| version_compile_os | Linux |
Question 2
Does the database character settings affect the output (by output I mean what I see in the browser) at all?
Update
Posted wrong Staging site database status output. I forgot the site was on a different staging site. Will get that info soon.
Update 2
I checked the php info to see which MySQL it was using and found these two lines differ than my other environments:
Client API version 5.1.59
Client API library version 5.1.59
Does that mean its using MySQL version 5.1.59 when used with PHP? If so how would I go about updating that part after I initially made the upgrade from 5.1 to 5.5 in CentOS?
Update 3
On the live site I have ran the following query:
SELECT post_title FROM wp_posts WHERE LENGTH(post_content) > CHAR_LENGTH(post_content);
This gave me all the results where the encoding is different (or something like that). I received a bunch of rows in the query and one of them was the content that I was having an issue with. My assumption is that utf8mb4 is being imported into utf8 but the tables and columns are all utf8mb4 encoding and collation. So I don't know where the character sets transform between this transaction. I have tested the strings in PHP to test the encoding and it says its UTF-8 which means it could be utf8 or utf8mb4 in mysql.
It could also be worth mentioning that I have been using Sequel Pro to import and export the data back and forth. So a possibility that Sequel Pro could be interfering with the importing/exporting of the sql data
Update 4
Tried this command:
ALTER DATABASE mydb CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
Tested it out and no change. Then I tried to import the sql file again and still, no change
SHOW FULL COLUMNS FROM wp_postmeta( or whatever table contains the mis-mapped characters you've found ) on your live site's DB? If I had to guess, I would assume the upgrade didn't actually change the collation of any of the existing tables.post_contentcolumn to utf8 on the live server, does the missing character behavior persist?