# PostgreSQL
A common and reliable open-source relation database system with support for advanced SQL standards and diverse data types.
## Supported Connection Methods
Available methods for connections to the target system from Lumi AI:
* [x] **Direct**
*The default / typical connection option. Interfaces directly with the target system over the Internet with no mediation. Suitable for most cloud-hosted scenarios or public-facing resources. See* [*Network Configuration*](https://docs.lumi-ai.com/using-lumi/network-configuration) *for more details.*
* [x] **Gateway**\
\&#xNAN;*An alternative connection method leveraging a Lumi AI Data Gateway. This uses Lumi AI's purpose-built connection agent to mediate communications. Ideal for restricting access to systems within a protected network. For more information, see* [*Data Gateway*](https://docs.lumi-ai.com/product-features/data-gateway)*.*
## Supported Limits
The following are limits that can be configured for the system to moderate access and usage from users in Lumi AI:
* [x] **Cost Limit**\
\&#xNAN;*Before running a query, if the system supports it, the system-specific compute cost (or surrogate) estimate will be processed and compared to an organization-level/admin-set cost limit for systems of this type (if configured/set). If exceeded, the query will not run (and either the workflow will attempt an optimization or the user will be notified).*
* [x] **Duration Limit**\
\&#xNAN;*An alternative to cost, queries will be stopped the system supports a duration/timeout limit and one is set/configured at the organization level (across systems).*
## Available Parameters
These properties are the essential source system connection properties that all queries are directed towards.
*\* Required parameters*
{% hint style="info" %}
Note: The Gateway parameter is common to all systems (when supported) and is only available when gateway is the selected connection method.
{% endhint %}
Host*
Domain or IP of the database to allow a connection to Lumi AI.
:thumbsup: **Valid Examples**
* Domain name: *docs.lumi-ai.com*
* IPv4: *55.88.92.101*
:thumbsdown: **Invalid Examples**
* IPv4 with alphanumeric characters: *123.abc.def.456*
* Incomplete domain name resolutions: *lumi-ai.com*
Port*
Access port to allow for connections to the database.
:thumbsup: **Valid Examples**
* Default PostgreSQL port: *5432*
:thumbsdown: **Invalid Examples**
* Known Port Numbers (0-1023): *80*
Username*
Username of the generated database user which will be used for interactions and transactions.
**Special Considerations**
* If double quotes are used, then the name will be case sensitive
:thumbsup: **Valid Examples**
* Uses alphanumeric characters : *lumi1*
* Utilizing underscore (\_) in place of spaces: *user\_number*
:thumbsdown: **Invalid Examples**
* Starting with a number: *1lumi*
* Utilizing spaces: *user name*
* Using invalid characters: *user#1*
Password*
Password of the generated database user which will be used for interactions and transactions.
Database*
Literal database name that will be used for transactions within the agents.
**Special Considerations**
* If case sensitivity is required, utilize double quotes for database name; ex. "New\_database"
:thumbsup: **Valid Examples**
* Uses alphanumeric characters: *lumi1*
* Utilizing underscore (\_) in place of spaces: *new\_database*
:thumbsdown: **Invalid Examples**
* Starting with a number: *1lumi*
* Utilizing spaces: *user name*
* Using reserved words unquoted: *select*
## System Permissions & Configuration
Provided user must have the following:
* [x] ROLE with LOGIN privileges
* [x] PRIVILEGE to CONNECT on database
* [x] PRIVILEGE to USAGE on schema
* [x] SELECT PRIVILEGE in table(s)
* [x] (if applicable) SELECT PRIVILEGE on table(s) for column(s)
For configurations:
* [x] Ensure the server is allowing connections from the Lumi gateway or server
## Special Considerations
* Special characters and case sensitivity can be utilized in database names and usernames via encasing the name in double quotes (" "), but is not recommended
## Common Issues
* Ensure the firewall settings allow for a connection to the database
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