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# FAQ - Frequently Asked Questions

## Server

### 1.12 I have lost my MySQL root password, what can I do?

The MySQL manual explains how to reset the permissions.

### 1.15 I have problems with mysql.user column names.

In previous MySQL versions, the User and Passwordcolumns were named user and password. Please modify your column names to align with current standards.

### 1.16 I cannot upload big dump files (memory, HTTP or timeout problems).

The first things to check (or ask your host provider to check) are the values of upload_max_filesize, memory_limit and post_max_size in the :file:php.ini configuration file. All of these three settings limit the maximum size of data that can be submitted and handled by PHP. One user also said that post_max_size and memory_limit need to be larger than upload_max_filesize. There exist several workarounds if your upload is too big or your hosting provider is unwilling to change the settings:

• Look at the :config:option:$cfg['UploadDir'] feature. This allows one to upload a file to the server via scp, ftp, or your favorite file transfer method. PhpMyAdmin is then able to import the files from the temporary directory. More information is available in the :ref:config of this document. • Using a utility (such as BigDump) to split the files before uploading. We cannot support this or any third party applications, but are aware of users having success with it. • If you have shell (command line) access, use MySQL to import the files directly. You can do this by issuing the "source" command from within MySQL: source filename.sql;  ### 1.17 Which MySQL versions does phpMyAdmin support? Since phpMyAdmin 3.0.x, only MySQL 5.0.1 and newer are supported. For older MySQL versions, you need to use the latest 2.x branch. phpMyAdmin can connect to your MySQL server using PHP's classic MySQL extension as well as the improved MySQL extension (MySQLi) that is available in PHP 5.0. The latter one should be used unless you have a good reason not to do so. When compiling PHP, we strongly recommend that you manually link the MySQL extension of your choice to a MySQL client library of at least the same minor version since the one that is bundled with some PHP distributions is rather old and might cause problems see :ref:faq1_17a. MariaDB is also supported (versions 5.1 and 5.2 were tested). ### 1.17a I cannot connect to the MySQL server. It always returns the error message, "Client does not support authentication protocol requested by server; consider upgrading MySQL client" You tried to access MySQL with an old MySQL client library. The version of your MySQL client library can be checked in your phpinfo() output. In general, it should have at least the same minor version as your server - as mentioned in :ref:faq1_17. This problem is generally caused by using MySQL version 4.1 or newer. MySQL changed the authentication hash and your PHP is trying to use the old method. The proper solution is to use the mysqli extension with the proper client library to match your MySQL installation. Your chosen extension is specified in :config:option:$cfg['Servers'][$i]['extension']. More information (and several workarounds) are located in the MySQL Documentation. ### 1.18 (withdrawn). ### 1.19 I can't run the "display relations" feature because the script seems not to know the font face I'm using! The :term:TCPDF library we're using for this feature requires some special files to use font faces. Please refers to the TCPDF manual to build these files. ### 1.20 I receive the error "cannot load MySQL extension, please check PHP Configuration". To connect to a MySQL server, PHP needs a set of MySQL functions called "MySQL extension". This extension may be part of the PHP distribution (compiled-in), otherwise it needs to be loaded dynamically. Its name is probably mysql.so or php_mysql.dll. phpMyAdmin tried to load the extension but failed. Usually, the problem is solved by installing a software package called "PHP-MySQL" or something similar. ### 1.21 I am running the CGI version of PHP under Unix, and I cannot log in using cookie auth. In :file:php.ini, set mysql.max_links higher than 1. ### 1.22 I don't see the "Location of text file" field, so I cannot upload. This is most likely because in :file:php.ini, your file_uploads parameter is not set to "on". ### 1.23 I'm running MySQL on a Win32 machine. Each time I create a new table the table and column names are changed to lowercase! This happens because the MySQL directive lower_case_table_names defaults to 1 (ON) in the Win32 version of MySQL. You can change this behavior by simply changing the directive to 0 (OFF): Just edit your my.ini file that should be located in your Windows directory and add the following line to the group [mysqld]: set-variable = lower_case_table_names=0 Next, save the file and restart the MySQL service. You can always check the value of this directive using the query SHOW VARIABLES LIKE 'lower_case_table_names';  ### 1.24 (withdrawn). ### 1.25 I am running Apache with mod_gzip-1.3.26.1a on Windows XP, and I get problems, such as undefined variables when I run a SQL query. A tip from Jose Fandos: put a comment on the following two lines in httpd.conf, like this: # mod_gzip_item_include file \.php$
# mod_gzip_item_include mime "application/x-httpd-php.*"

as this version of mod_gzip on Apache (Windows) has problems handling PHP scripts. Of course you have to restart Apache.

### 1.26 I just installed phpMyAdmin in my document root of IIS but I get the error "No input file specified" when trying to run phpMyAdmin.

This is a permission problem. Right-click on the phpmyadmin folder and choose properties. Under the tab Security, click on "Add" and select the user "IUSR_machine" from the list. Now set his permissions and it should work.

### 1.39 When I try to connect via https, I can log in, but then my connection is redirected back to http. What can cause this behavior?

Be sure that you have enabled SSLOptions and StdEnvVars in your Apache configuration.

To be able to use cookie auth Apache must know that it has to rewrite the set-cookie headers. Example from the Apache 2.2 documentation:

ProxyPass /mirror/foo/ http://backend.example.com/
ProxyPassReverse /mirror/foo/ http://backend.example.com/
ProxyPassReverseCookiePath / /mirror/foo/

Note: if the backend url looks like http://host/~user/phpmyadmin, the tilde (~) must be url encoded as %7E in the ProxyPassReverse* lines. This is not specific to phpmyadmin, it's just the behavior of Apache.

ProxyPass /mirror/foo/ http://backend.example.com/~user/phpmyadmin
ProxyPassReverseCookiePath /%7Euser/phpmyadmin /mirror/foo

### 1.41 When I view a database and ask to see its privileges, I get an error about an unknown column.

The MySQL server's privilege tables are not up to date, you need to run the :command:mysql_upgrade command on the server.

### 1.42 How can I prevent robots from accessing phpMyAdmin?

You can add various rules to :term:.htaccess to filter access based on user agent field. This is quite easy to circumvent, but could prevent at least some robots accessing your installation.

RewriteEngine on

# Allow only GET and POST verbs

Check the value you set for the :config:option:$cfg['PmaAbsoluteUri'] directive in the phpMyAdmin configuration file. ### 2.6 I get an "Access denied for user: 'root@localhost' (Using password: YES)"-error when trying to access a MySQL-Server on a host which is port-forwarded for my localhost. When you are using a port on your localhost, which you redirect via port-forwarding to another host, MySQL is not resolving the localhost as expected. Erik Wasser explains: The solution is: if your host is "localhost" MySQL (the command line tool :command:mysql as well) always tries to use the socket connection for speeding up things. And that doesn't work in this configuration with port forwarding. If you enter "127.0.0.1" as hostname, everything is right and MySQL uses the :term:TCP connection. ### 2.7 Using and creating themes Themes are configured with :config:option:$cfg['ThemePath'], :config:option:$cfg['ThemeManager'] and :config:option:$cfg['ThemeDefault']. Under :config:option:$cfg['ThemePath'], you should not delete the directory pmahomme or its underlying structure, because this is the system theme used by phpMyAdmin. pmahomme contains all images and styles, for backwards compatibility and for all themes that would not include images or css-files. If :config:option:$cfg['ThemeManager'] is enabled, you can select your favorite theme on the main page. Your selected theme will be stored in a cookie.

To create a theme:

• make a new subdirectory (for example "your_theme_name") under :config:option:$cfg['ThemePath'] (by default themes) • copy the files and directories from pmahomme to "your_theme_name" • edit the css-files in "your_theme_name/css" • put your new images in "your_theme_name/img" • edit :file:layout.inc.php in "your_theme_name" • edit :file:info.inc.php in "your_theme_name" to contain your chosen theme name, that will be visible in user interface • make a new screenshot of your theme and save it under "your_theme_name/screen.png" In theme directory there is file :file:info.inc.php which contains theme verbose name, theme generation and theme version. These versions and generations are enumerated from 1 and do not have any direct dependence on phpMyAdmin version. Themes within same generation should be backwards compatible - theme with version 2 should work in phpMyAdmin requiring version 1. Themes with different generation are incompatible. If you do not want to use your own symbols and buttons, remove the directory "img" in "your_theme_name". phpMyAdmin will use the default icons and buttons (from the system-theme pmahomme). ### 2.8 I get "Missing parameters" errors, what can I do? Here are a few points to check: • In :file:config.inc.php, try to leave the :config:option:$cfg['PmaAbsoluteUri'] directive empty. See also :ref:faq4_7.
• Maybe you have a broken PHP installation or you need to upgrade your Zend Optimizer. See <http://bugs.php.net/bug.php?id=31134>.
• If you are using Hardened PHP with the ini directive varfilter.max_request_variables set to the default (200) or another low value, you could get this error if your table has a high number of columns. Adjust this setting accordingly. (Thanks to Klaus Dorninger for the hint).
• In the :file:php.ini directive arg_separator.input, a value of ";" will cause this error. Replace it with "&;".
• If you are using Hardened-PHP, you might want to increase request limits.
• The directory specified in the :file:php.ini directive session.save_path does not exist or is read-only.

### 2.9 Seeing an upload progress bar

To be able to see a progress bar during your uploads, your server must have the APC extension, the uploadprogress one, or you must be running PHP 5.4.0 or higher. Moreover, the JSON extension has to be enabled in your PHP.

If using APC, you must set apc.rfc1867 to on in your :file:php.ini.

If using PHP 5.4.0 or higher, you must set session.upload_progress.enabled to 1 in your :file:php.ini.

## Known limitations

### 3.1 When using HTTP authentication, a user who logged out can not log in again in with the same nick.

This is related to the authentication mechanism (protocol) used by phpMyAdmin. To bypass this problem: just close all the opened browser windows and then go back to phpMyAdmin. You should be able to log in again.

### 3.9 I get error messages when using "--sql_mode=ANSI" for the MySQL server

When MySQL is running in ANSI-compatibility mode, there are some major differences in how :term:SQL is structured (see <http://dev.mysql.com/doc/mysql/en/ansi-mode.html>). Most important of all, the quote-character (") is interpreted as an identifier quote character and not as a string quote character, which makes many internal phpMyAdmin operations into invalid :term:SQL statements. There is no workaround to this behaviour. News to this item will be posted in Bug report #816858

When starting phpMyAdmin, you can use the db, pma_username, pma_password and server parameters. This last one can contain either the numeric host index (from $i of the configuration file) or one of the host names present in the configuration file. Using pma_username and pma_password has been tested along with the usage of 'cookie' auth_type. ## Browsers or client OS ### 5.1 I get an out of memory error, and my controls are non-functional, when trying to create a table with more than 14 columns. We could reproduce this problem only under Win98/98SE. Testing under WinNT4 or Win2K, we could easily create more than 60 columns. A workaround is to create a smaller number of columns, then come back to your table properties and add the other columns. ### 5.2 With Xitami 2.5b4, phpMyAdmin won't process form fields. This is not a phpMyAdmin problem but a Xitami known bug: you'll face it with each script/website that use forms. Upgrade or downgrade your Xitami server. ### 5.3 I have problems dumping tables with Konqueror (phpMyAdmin 2.2.2). With Konqueror 2.1.1: plain dumps, zip and GZip dumps work ok, except that the proposed file name for the dump is always 'tbl_dump.php'. Bzip2 dumps don't seem to work. With Konqueror 2.2.1: plain dumps work; zip dumps are placed into the user's temporary directory, so they must be moved before closing Konqueror, or else they disappear. GZip dumps give an error message. Testing needs to be done for Konqueror 2.2.2. ### 5.4 I can't use the cookie authentication mode because Internet Explorer never stores the cookies. MS Internet Explorer seems to be really buggy about cookies, at least till version 6. ### 5.5 In Internet Explorer 5.0, I get JavaScript errors when browsing my rows. Upgrade to at least Internet Explorer 5.5 SP2. ### 5.6 In Internet Explorer 5.0, 5.5 or 6.0, I get an error (like "Page not found") when trying to modify a row in a table with many columns, or with a text column Your table neither have a primary key nor an unique one, so we must use a long :term:URL to identify this row. There is a limit on the length of the :term:URL in those browsers, and this not happen in Netscape, for example. The workaround is to create a primary or unique key, or use another browser. ### 5.7 I refresh (reload) my browser, and come back to the welcome page. Some browsers support right-clicking into the frame you want to refresh, just do this in the right frame. ### 5.8 With Mozilla 0.9.7 I have problems sending a query modified in the query box. Looks like a Mozilla bug: 0.9.6 was OK. We will keep an eye on future Mozilla versions. ### 5.9 With Mozilla 0.9.? to 1.0 and Netscape 7.0-PR1 I can't type a whitespace in the SQL-Query edit area: the page scrolls down. This is a Mozilla bug (see bug #26882 at BugZilla). ### 5.10 With Netscape 4.75 I get empty rows between each row of data in a CSV exported file. This is a known Netscape 4.75 bug: it adds some line feeds when exporting data in octet-stream mode. Since we can't detect the specific Netscape version, we cannot workaround this bug. ### 5.11 Extended-ASCII characters like German umlauts are displayed wrong. Please ensure that you have set your browser's character set to the one of the language file you have selected on phpMyAdmin's start page. Alternatively, you can try the auto detection mode that is supported by the recent versions of the most browsers. ### 5.12 Mac OS X Safari browser changes special characters to "?". This issue has been reported by a :term:Mac OS X user, who adds that Chimera, Netscape and Mozilla do not have this problem. ### 5.13 With Internet Explorer 5.5 or 6, and HTTP authentication type, I cannot manage two servers: I log in to the first one, then the other one, but if I switch back to the first, I have to log in on each operation. This is a bug in Internet Explorer, other browsers do not behave this way. ### 5.14 Using Opera6, I can manage to get to the authentication, but nothing happens after that, only a blank screen. Please upgrade to Opera7 at least. ### 5.15 I have display problems with Safari. Please upgrade to at least version 1.2.3. ### 5.16 With Internet Explorer, I get "Access is denied" Javascript errors. Or I cannot make phpMyAdmin work under Windows. Please check the following points: • Maybe you have defined your :config:option:$cfg['PmaAbsoluteUri'] setting in :file:config.inc.php to an :term:IP address and you are starting phpMyAdmin with a :term:URL containing a domain name, or the reverse situation.
• Security settings in IE and/or Microsoft Security Center are too high, thus blocking scripts execution.
• The Windows Firewall is blocking Apache and MySQL. You must allow :term:HTTP ports (80 or 443) and MySQL port (usually 3306) in the "in" and "out" directions.

### 5.17 With Firefox, I cannot delete rows of data or drop a database.

Many users have confirmed that the Tabbrowser Extensions plugin they installed in their Firefox is causing the problem.

### 5.18 With Konqueror 4.2.x an invalid LIMIT clause is generated when I browse a table.

This happens only when both of these conditions are met: using the http authentication mode and register_globals being set to On on the server. It seems to be a browser-specific problem; meanwhile use the cookie authentication mode.

### 5.19 I get JavaScript errors in my browser.

Issues have been reported with some combinations of browser extensions. To troubleshoot, disable all extensions then clear your browser cache to see if the problem goes away.

### 6.1 I can't insert new rows into a table / I can't create a table - MySQL brings up a SQL error.

Examine the :term:SQL error with care. Often the problem is caused by specifying a wrong column-type. Common errors include:

• Using VARCHAR without a size argument
• Using TEXT or BLOB with a size argument

Also, look at the syntax chapter in the MySQL manual to confirm that your syntax is correct.

### 6.2 When I create a table, I set an index for two columns and phpMyAdmin generates only one index with those two columns.

This is the way to create a multi-columns index. If you want two indexes, create the first one when creating the table, save, then display the table properties and click the Index link to create the other index.

### 6.3 How can I insert a null value into my table?

Since version 2.2.3, you have a checkbox for each column that can be null. Before 2.2.3, you had to enter "null", without the quotes, as the column's value. Since version 2.5.5, you have to use the checkbox to get a real NULL value, so if you enter "NULL" this means you want a literal NULL in the column, and not a NULL value (this works in PHP4).

### 6.22 Bookmarks: Can I execute a default bookmark automatically when entering Browse mode for a table?

Yes. If a bookmark has the same label as a table name and it's not a public bookmark, it will be executed.

### 6.23 Export: I heard phpMyAdmin can export Microsoft Excel files?

You can use :term:CSV for Microsoft Excel, which works out of the box.

Automatic migration of a table's pmadb-style column comments to the native ones is done whenever you enter Structure page for this table.

### 6.26 How can I select a range of rows?

Click the first row of the range, hold the shift key and click the last row of the range. This works everywhere you see rows, for example in Browse mode or on the Structure page.

### 6.27 What format strings can I use?

In all places where phpMyAdmin accepts format strings, you can use @VARIABLE@ expansion and strftime format strings. The expanded variables depend on a context (for example, if you haven't chosen a table, you can not get the table name), but the following variables can be used:

@HTTP_HOST@
@SERVER@
MySQL server name
@VERBOSE@
Verbose MySQL server name as defined in :config:option:$cfg['Servers'][$i]['verbose']
@VSERVER@
Verbose MySQL server name if set, otherwise normal
@DATABASE@
Currently opened database
@TABLE@
Currently opened table
@COLUMNS@
Columns of the currently opened table
@PHPMYADMIN@

### 6.28 How can I easily edit relational schema for export?

By clicking on the button 'toggle scratchboard' on the page where you edit x/y coordinates of those elements you can activate a scratchboard where all your elements are placed. By clicking on an element, you can move them around in the pre-defined area and the x/y coordinates will get updated dynamically. Likewise, when entering a new position directly into the input field, the new position in the scratchboard changes after your cursor leaves the input field.

You have to click on the 'OK'-button below the tables to save the new positions. If you want to place a new element, first add it to the table of elements and then you can drag the new element around.

By changing the paper size and the orientation you can change the size of the scratchboard as well. You can do so by just changing the dropdown field below, and the scratchboard will resize automatically, without interfering with the current placement of the elements.

If ever an element gets out of range you can either enlarge the paper size or click on the 'reset' button to place all elements below each other.

### 6.29 Why can't I get a chart from my query result table?

Not every table can be put to the chart. Only tables with one, two or three columns can be visualised as a chart. Moreover the table must be in a special format for chart script to understand it. Currently supported formats can be found in the wiki.

### 6.30 Import: How can I import ESRI Shapefiles

An ESRI Shapefile is actually a set of several files, where .shp file contains geometry data and .dbf file contains data related to those geometry data. To read data from .dbf file you need to have PHP compiled with the dBase extension (--enable-dbase). Otherwise only geometry data will be imported.

To upload these set of files you can use either of the following methods:

Configure upload directory with :config:option:$cfg['UploadDir'], upload both .shp and .dbf files with the same filename and chose the .shp file from the import page. Create a Zip archive with .shp and .dbf files and import it. For this to work, you need to set :config:option:$cfg['TempDir'] to a place where the web server user can write (for example './tmp').

To create the temporary directory on a UNIX-based system, you can do:

cd phpMyAdmin
mkdir tmp
chmod o+rwx tmp

### 6.31 How do I create a relation in designer?

To select relation, click: The display column is shown in pink. To set/unset a column as the display column, click the "Choose column to display" icon, then click on the appropriate column name.

### 6.32 How can I use the zoom search feature?

The Zoom search feature is an alternative to table search feature. It allows you to explore a table by representing its data in a scatter plot. You can locate this feature by selecting a table and clicking the :guilabel:Search tab. One of the sub-tabs in the :guilabel:Table Search page is :guilabel:Zoom Search.

Consider the table REL_persons in :ref:faq6_6 for an example. To use zoom search, two columns need to be selected, for example, id and town_code. The id values will be represented on one axis and town_code values on the other axis. Each row will be represented as a point in a scatter plot based on its id and town_code. You can include two additional search criteria apart from the two fields to display.

You can choose which field should be displayed as label for each point. If a display column has been set for the table (see :ref:faqdisplay), it is taken as the label unless you specify otherwise. You can also select the maximum number of rows you want to be displayed in the plot by specifing it in the 'Max rows to plot' field. Once you have decided over your criteria, click 'Go' to display the plot.

After the plot is generated, you can use the mousewheel to zoom in and out of the plot. In addition, panning feature is enabled to navigate through the plot. You can zoom-in to a certail level of detail and use panning to locate your area of interest. Clicking on a point opens a dialogue box, displaying field values of the data row represented by the point. You can edit the values if required and click on submit to issue an update query. Basic instructions on how to use can be viewed by clicking the 'How to use?' link located just above the plot.

### 6.33 When browsing a table, how can I copy a column name?

Selecting the name of the column within the browse table header cell for copying is difficult, as the columns support reordering by dragging the header cells as well as sorting by clicking on the linked column name. To copy a column name, double-click on the empty area next to the column name, when the tooltip tells you to do so. This will show you an input box with the column name. You may right-click the column name within this input box to copy it to your clipboard.

### 7.2 I want to translate the messages to a new language or upgrade an existing language, where do I start?

Translations are very welcome and all you need to have are the language skills. The easiest way is to use our online translation service. You can check out all the possibilities to translate in the translate section on our website.

### 7.3 I would like to help out with the development of phpMyAdmin. How should I proceed?

We welcome every contribution to the development of phpMyAdmin. You can check out all the possibilities to contribute in the contribute section on our website.

## Security

### 8.2 How can I protect phpMyAdmin against brute force attacks?

If you use Apache web server, phpMyAdmin exports information about authentication to the Apache environment and it can be used in Apache logs. Currently there are two variables available:

userID
User name of currently active user (he does not have to be logged in).
userStatus
Status of currently active user, one of ok (user is logged in), mysql-denied (MySQL denied user login), allow-denied (user denied by allow/deny rules), root-denied (root is denied in configuration), empty-denied (empty password is denied).

LogFormat directive for Apache can look like following:

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %{userID}n %{userStatus}n"   pma_combined

You can then use any log analyzing tools to detect possible break-in attempts.