# Parameters

### General <a href="#h.ngydid6um4rf" id="h.ngydid6um4rf"></a>

* **Host:** contains target IP address or database server hostname.
* **Port:** contains database server port (5432 by default).
* **Database:** contains name of the database.
* **Schema**: contains name of the schema.
* **Table Prefix**: contains prefix of the tables.
* **Connection Timeout:** contains the time interval (in milliseconds) within which the connection to the database should be established. If the connection is not established within the specified time, an error occurs.
* **Request Timeout:** contains time interval (in milliseconds) within which the response from the database server must be received. If the response is not received during the specified interval, an error occurs.
* **Max. Buffer Size:** contains maximum size of sample buffer for each time series that is accumulated in the server memory. &#x20;
* **Wait after Write:** contains timeout interval (in milliseconds) before the start of next data writing to the store.
* **Wait after Error**: contains timeout interval (in milliseconds) in case an error occurs during data writing or store preparation.
* **Inter-request Interval:** contains timeout interval (in milliseconds) before sending the next request. It is used if data doesn’t fit in one request.

### Security <a href="#h.vsannrjlkcdw" id="h.vsannrjlkcdw"></a>

* **Username:** contains username.
* **Password:** contains password.
* **Use SSL:** specifies that it is necessary to verify database server SSL certificate.
* **SSL Verification:** contains verification mode of database server SSL certificate:
  * Accept any.
  * Verify chain of trust by using a store of certificates of the operating system.
  * Verify chain of trust by using custom certificate of certification authority.
* **Custom CA File:**  contains custom certificate of certification authority.

### Performance <a href="#h.45fuuylh92h8" id="h.45fuuylh92h8"></a>

* **Series per Request:** contains maximum number of time series that can be written per one request.
* **Samples per Request:** contains maximum number of samples for each time series that can be written per one request.
* **Max. Buffer Size:** contains maximum size of sample buffer for each time series that is accumulated in the server memory.
* **Wait after Write:** contains timeout interval (in milliseconds) before the start of next data writing to the store.
* **Wait after Error**: contains timeout interval (in milliseconds) in case an error occurs during data writing or store preparation.
* **Inter-request Interval:** contains timeout interval (in milliseconds) before sending the next request. It is used if data doesn’t fit in one request.

### Advanced <a href="#h.tgirsy885ch8" id="h.tgirsy885ch8"></a>

* **Add Server UID to Tag:** specifies that for all store associated time series server UID will be added as *su* tag value (record metadata).
* **Add Store UID to Tag:** specifies that for all store associated time series store UID will be added as *stu* tag value (record metadata).
* **Add Time Series UID to Tag:** specifies that for all store associated time series time series UID will be added as *tsu* tag value (record metadata).
* **Add Time Series Path to Tag:** specifies that for all store associated time series string path to time series will be added as *tsp* tag value (record metadata).
* **Add Time Series Comment to Tag**: specifies that for all store associated time series comment to time series will be added as *tsc* tag value (record metadata).
* **Use Server UID in ‘Hash’ Addresses:** specifies that unique server identifier should be used to generate *Hash* addresses.
* **Database Auto-creation:** if the parameter is set, database will be created automatically.
* **Schema Auto-creation:** if the parameter is set, schema will be created automatically.
* **Table Auto-creation:** if the parameter is set, data and metadata tables will be created automatically.
* **Index Auto-creation:** if the parameter is set, indexes for tables will be created automatically.