TeamCity supports parameters, so if you are dealing with so many build configurations on your TeamCity server and you need to change something in all of your projects, the best practice is to use parameters or build templates. But what if you need to change a value in multiple build configurations or multiple projects and that value cannot be (or is not) defined as a parameter? In such cases you can use the following shortcut instead of going through each build configuration to edit them:

1. On the TeamCity machine, open the data directory. It can be identified using the TEAMCITY_DATA_PATH environment variable.
2. Open the corresponding directory to your required project from %TEAMCITY_DATA_PATH%\config\projects.
3. All of the build configurations are stored as XML files in the buildTypes directory.
4. Use a powerful text editor (e.g. Notepad++ ) to batch edit the files.
5. From the TeamCity administration page, go to Server Administration\Diagnostics\Caches and reset buildsMetadata.

After a couple of seconds the changes should be reflected in all of your build configurations.

Using the following command you will have access to advanced user management dialogue which allows you to add,edit or delete the stored network credentials (Advanced Tab):
Control Userpasswords2

Reference: http://support.microsoft.com/kb/306992

1- Open your MySql client, e.g. SQLyog.

2- Run the following command to see how  many concurrent connections is MySql server currently allowing:
SHOW VARIABLES LIKE "max_connections";

3- Run the following command to increase the number of concurrent connections:
SET GLOBAL max_connections = 1000;

Check MySQl official page for more details.

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