Running WAMP localhost server With php 5.6.18 and MySQL 5.7.11 In project that im working on now i need to get some column data form information_schema.COLUMNS table, but information_schema DB is completely empty - 0 rows for every table in this DB For additional information - I have like 10 differnet DB on this MySQL, some are imported some are made from scratch in phpmyadmin.So im completely lost - tried to google but no luck.Maybe i miss something essential and trivial like some configuration of MySQL?
Execute this query:
mysql> SHOW GRANTS;
This will show you that either you are not logging in as the user you intend to use, or that this user lacks permissions on the tables in question.
In this case, the user may have no permissions at all. MySQL has a special permission called USAGE, which may seem slightly deceptively named if you aren't familiar with what it means. It means you can "use" the server -- that is, you can log in. But that is all it means. If you possess only the USAGE ON *.* privilege, this means you have permission to log in to the server, but no permissions on anything else.
The information_schema is integrated with the permissions system. You can't see information about database objects for which you don't have permissions. An empty information_schema.columns table suggests a permissions issue for the user you are using to connect to the server.
Sometimes this may be issue when you copy and paste the database's folders in mysql folder. Don't copy that way. The best way to export the databases using "export" command in "phpmyadmin" or use "mysqldump" command in mysql command line client to copy the data or export data from one to another.It will generate "yourdata.sql" file at the last , You can import that data using "export command in "phpmyadmin" . In your method is successful for "MyISAM" database driver in mysql. Modern mysql servers default database driver is "InnoDB" and it not success in when copy the database data folder on to another machine. If you have copy of previous copy of the databases from the old machine, try to export the "yourdata.sql" file using export method in "phpmyadmin" web interface.
I faced same problem when I transfer/shifted my mysql folder to other location.
And configured DB to point Mysql folder accordingly.
However, Information_schema was not getting updated though rest DB queries were running fine.I could't find proper solution but the way around was from mysql editor (like workbench) do inspect schema.
You will get an option in bottom to 'Information Outdated' and then click on Analyze table. You will find that Information_schema start calculating correct size and other details.
Related
First ever Stack Overflow post, thanks for your time. Any constructive criticism on how to post better, please just let me know. I have done a search on my query and have found similar posts, but I was unable to use the information within them to resolve my problem.
I have created a mysql database using the terminal window in my Ubuntu system (which I am also new to, having been a lifelong windows user). I used the following code in the terminal window:
$ mysql -u root -p
Then once in mysql, I did the following
CREATE DATABASE securities_master;
USE securities_master;
I created a user and tables in the database using some other code, that doesn't seem relevant here, so I won't bother posting. However, I then decided I would like to take a look at the tables in the database, so I downloaded an SQLite browser. It was at this point that I realized I could not find my database file.
I tried to find the answer on previous stack overflow posts, and tried the suggestions of:
locate sqlite
locate .db
locate .sqlite
locate securities_master
But unfortunately, none of these showed the file I was looking for. The only place I can think of would be what is called the 'root' directory in my computer, but the Ubuntu file manager system won't let me view it because it says I don't have permissions. Is this where it might be?
Could someone shed some light on where I might be able to find this file/database? I know it is definitely there because if I try to CREATE it again, I get the message that it can't because it already exists.
Thanks again.
sqlite and mysql are two different databases. You can't use sqlite on a mysql database. sqlite is a single-file database, in which users just open the file and read and write to it, while mysql is a more traditional relational database system with a server and a client, where the server manages the database (which is generally in a directory of files), while the client just connects to the server.
Where the mysql database is located my depend on your system, but it's usually in /var/lib/mysql. You can look in /etc/mysql/my.cnf for the configuration file, which should have a datadir option that refers to where the actual data for the database is stored.
You can check my.ini file to see where the data folder is located.
Usually there is a folder {mysqlDirectory}/data
MySQL data storage:
Commands.frm
Commands.myd
Commands.myi
The *.frm files contain the table definitions. Your *.myi files are MyISAM index files. Your *.myd files contain the table data.
as mentioned in the answer before mine, mysql and sqlite are two different systems.
You mention you used the cmd line mysql to create the database and then wanted to view the tables. If you're simply trying to see which table are created, in the same command line you used to Create the database you can run show tables;
If you're after a GUI for this, we'd need a bit more context. Is this ubuntu system a remote server, or are you using the desktop version?
You say you're a long time windows user, If you're using windows locally, I personally like SQLWorkbench for accessing my remote mysql servers.
EDIT: I just re-read your post and realised you're using local ubuntu desktop so me mentioning remote was silly, my bad! However, SQLWorkbench does have a ubuntu version at https://dev.mysql.com/downloads/workbench/
I own a machine running third party software. I input data into this software and it stores that data into its own mysql database. I'd like query the mysql database directly, but I don't know the credentials that the application is using.
I have read and write access for all files in the machine, including the files in the mysql data directory. Theoretically, I should be able to read the data directly from these files (.ibd and .frm files). But practically, I don't know where to start. I'm thinking that these data files are somewhat readable since encrypting them would destroy their index-ability.
Is this feasible? Or would I have to reverse engineer the data file format in order to read it?
Or even better - is there some config file that I can change which would implicitly trust all local connections similar to postgres?
You could read the mysql files directly, but even if they're now encrypted, the columns names might be weird and you could have to spend some time reading them.
Another point could be looking for config files from that software, that could have the login/password (very very low probability, but who knows?)
And the best would be:
make a backup of the mysql files
in another mysql instalation / computer (to not break your software), follow the reset mysql password guide
Try accessing it via the command line on the local machine:
shell> mysql db_name
(from MySQL documentation)
From here, you can create yourself an account if you need to connect from other client software.
Or have you already tried that?
If you have root access to the machine that MySQL is running on, then you can reset the MySQL root password by following the procedure at: http://www.cyberciti.biz/tips/recover-mysql-root-password.html. Once you've reset the root password, you can then login to MySQL as the root MySQL user, and access any of the databases, and query them. The only caveat to keep in mind is that changing the MySQL root password could potentially prevent your application from accessing the MySQL database, but that would be surprising as the application should be designed to connect to the database using a MySQL user account (with limited privileges) other than the root MySQL user.
One of my db have tables around 10000(temporary use).
But what it has done that opening phpmyadmin become slow and my version is "2.6.0-pl2".
Because of this version I cannot use skip_db option of phpmyadmin.
So I decided to have a new user with permission to all database except one but I don't know how to do that.
So can someone tell me how to write grant to all db with skipping just one db ?
There is no need to create a user for this problem.
use show database command and you will get list of db.
In phpmyadmin version "2.6.0-pl2" , you can use show_db variable and set all tables there are your problem will be solved
I have a joomla 2.5 site created locally on my machine, that I've migrated to a vps running nginx, php and mysql. Here is what i did in order:
1. Uploaded all the joomla files in the public_html
2. Changed all the files permission to 644 and all the folders to 755
3. Imported the database.sql to mysql using these commands:
--> mysql> create database databasename;
--> mysql> GRANT ALL PRIVILEGES ON
databasename.* TO username#localhost IDENTIFIED BY 'password';
--> mysql> flush privileges;
--> mysql> exit
--> user#vps:~$ mysql -p -u username database_name < file.sql
I can see all my tables inside the database already, and changed all the needed information on my joomla configuration.php but when i open my site, i get this error:
Table 'databasename.s1t3j0s_session' doesn't exist SQL=INSERT INTO `s1t3j0s_session` (`session_id`, `client_id`, `time`) VALUES ('rh249ehb2tbsqkdff34v177d76', 0, '1357339991')
Where did i got it wrong?
I have migrated wordpress site to the same server with no error.
I've been having trouble with it for weeks. What I needed was a backup copy on my system. However, when I uploaded the database from the remote server onyto my localhost I was getting error messages relating to the session table not existing (the same error that you are getting).
I tried all of the tips relating to deleting and re-creating the tables, but this did not work.
The only solution which worked 100% - which I finally discovered today, was to re-install Joomla 2.5 (I used a fresh install), and then do the following:
Instead of uploading the database from site containing the correct content, instead go through the SQL file itself (i.e. the one you will have exported for upload before encountering problems), and manually process each one of the insert statements into your SQL console directly (I'm using PHPMyadmin). In other words, don't attempt to import the whole file as you normally would. To do this will just result in errors.
For some reason, Joomla 2.5 has an issue with tables that are already populated with data being replaced by a dump file or replacement, sometimes duplicate, data. Hence the need for a fresh install....
Before processing each of the install statements individually (this can take a while - it took me about an hour and a half), go through each of the Joomla tables and make sure that NONE of them are populated with any data whatsoever (therefore when you process the install statements they will not be replacing existing data - because you will have removed all data from populated tables).
So long as you make sure that no INSERTED data has been added to the tables prior to the migration, this will solve your problem.
So to summise:
1/ Get a fresh J2.5 install.
2/ Delete all popolated table data from every joomla table.
3/ Copy and paste each of the insert statements from the exported mysql file containing the correct data. Process each statement individually (this is optional, but highly recommended: to do it this way enables you to counter and pinpoint any individual errors if and when they occur - without having to look through the entire mysql file)
...Go to your site: bingo - it should work!
Make sure the value of $dbprefix in configuration.php under the Joomla directory has the correct value by checking it against the actual db prefix used (open phpMyAdmin and choose the Joomla database to check for this).
Just truncate the data in the session table and do the process again. You have nothing to worry about truncating because there are no valuable data. Session table sometimes messes up stuff.
On Unix, table names are case sensitive. On Windows, they are not. Fun, isn't it? Kinda like their respective file systems. Do you think it's a coincidence?
Caveat: it probably depends on table type; MyISAM.
Field names are case-insensitive regardless.
I had this problem,
in my case, I imported the database through the cpanel and later on got this error message. I later found out that importing database through the cpanel didnot import the tables, just the database name. So I went to the phpmyadmin and import the database there once again, and solved.
Sorry for a noob question regarding MySQL. I downloaded FlightStats to learn about mysql but I can't figure out how to register it with my localhost mysql db. I know in MS SQL you can simply register any sql db using sql studio. I tried to google but come up with no result. Perhaps, my search phrase is wrong. I'm searching with "how to register a mysql database, register a mysql database...etc.". How do you register or setup an database from existing database like FlightStats? I'm using DBVisualizer. Is there a way in dbVis that I'm not aware of to regsiter a database?
Thanks
edit: sorry for the bad wording. I found this. I have the .myd, .myi and .frm and I want to get it to restore(?) with my local mysql instance. I look at all the answers but I'm still confuse as how you restore the database from those 3 files.
A little background first. The FlightStats download page linked to in the original question appears to provide zipped tarballs of the binary table storage files from the MySQL data directory. Given that this is considered a viable means of distribution, and combined with the use of MERGE tables, I would surmise that this tarball contains a bunch of MyISAM data files (.myi, .myd). Jack's edit confirms that this is the situation.
This is an atypical means of distributing a MySQL data set, although not at all uncommon when backing up MyISAM storage, and probably not all that unheard of for moving large data sets around; it likely works out considerably more space-efficient than a corresponding dump file. Of course, in SQL Server land, it's pretty common to attach database files into an instance.
Broadly speaking, you'd recover the database as follows:
Locate the MySQL data directory; typically /var/mysql or similar
Create a new directory with the desired database name e.g. flightdata
Extract the .myi, .myd and other files from the tarball into this directory
Make sure the entire directory is owned by the user MySQL runs as (usually mysql) - use chmod -R to make sure you get everything
Open a MySQL console
USE <database-name>
SHOW TABLES
You should see some tables listed. In addition, the downloads page linked includes a couple of SQL scripts, which contain SQL commands that you need to run against your database once it's in place. These will cause the merge definitions and table indexes to be rebuilt. You can pipe these into the command-line client, e.g. mysql -u<username> -p<password> <database-name> < <sql-file>.
It may be a good idea to shut down the MySQL server while you're doing this; use e.g. /etc/init.d/mysql stop or similar, and restart once the files are extracted in place.
There's generally a way to import sql files using a GUI database tool. I'm not familiar with DBVisualizer, but as long as you have a MySQL command line client installed you can do it there as well. It's pretty easy:
Create a blank schema. You can do this in your GUI tool or on the command line client. Just use CREATE DATABASE flightstats;, or whatever name you want.
Use the following command line syntax to import/run an sql file on the new schema: mysql -u <username> -p flightstats < /path/to/file.sql
The -p option prompts for a password. I generally set up the database using step 1 as the root user, then GRANT some permissions on it to a new user id, then use that user id to run the SQL file.
This process is pretty much what a GUI tool will do in the background.
Registering a database? dont know what that means however mysql gui tools can help you creating a database. Have a look at it or better you download phpmyadmin.
Google WAMP for Windows.
Google MAMP for Mac.
Google LAMP for Linux.
Any questions?