DynamoDB Data Model

Connection String Options

  1. Access Key
  2. Auto Cache
  3. Auto Detect Index
  4. Batch Size
  5. Cache Connection
  6. Cache Driver
  7. Cache Location
  8. Cache Metadata
  9. Cache Query Result
  10. Connection Life Time
  11. Connect On Open
  12. Domain
  13. Firewall Password
  14. Firewall Port
  15. Firewall Server
  16. Firewall Type
  17. Firewall User
  18. Flatten Arrays
  19. Flatten Objects
  20. Generate Schema Files
  21. Insert Mode
  22. Location
  23. Logfile
  24. Maximum Request Retries
  25. Max Log File Size
  26. Max Rows
  27. MFA Serial Number
  28. MFA Token
  29. Number Column Mode
  30. Offline
  31. Other
  32. Pagesize
  33. Pool Idle Timeout
  34. Pool Max Size
  35. Pool Min Size
  36. Pool Wait Time
  37. Proxy Auth Scheme
  38. Proxy Auto Detect
  39. Proxy Exceptions
  40. Proxy Password
  41. Proxy Port
  42. Proxy Server
  43. Proxy SSL Type
  44. Proxy User
  45. Pseudo Columns
  46. Readonly
  47. Region
  48. Retry Wait Time
  49. Role ARN
  50. Row Scan Depth
  51. RTK
  52. Secret Key
  53. Separator Character
  54. SSL Server Cert
  55. Support Enhanced SQL
  56. Tables
  57. Temporary Token Duration
  58. Thread Count
  59. Timeout
  60. Type Detection Scheme
  61. Url
  62. Use Connection Pooling
  63. Use EC2 Roles
  64. Use Simple Names
  65. Verbosity
  66. Views

Access Key

Data Type

string

Default Value

""

Remarks

Your AWS account access key. This value is accessible from your AWS security credentials page:

  1. Sign into the AWS Management console with the credentials for your root account.
  2. Select your account name or number and select My Security Credentials in the menu that is displayed.
  3. Click Continue to Security Credentials and expand the Access Keys section to manage or create root account access keys.

 

 

 

Auto Cache

Data Type

bool

Default Value

false

Remarks

When AutoCache is set, the driver automatically maintains a cache of your table's data in the database of your choice. With CacheQueryResult additionally set, the driver updates the cache when you execute a SELECT query and returns the live results from the DynamoDB data.

 

Explicitly Caching SELECT Results

 

CacheQueryResult is a way to query DynamoDB in real time while maintaining a cache for offline use. Set CacheQueryResult to update the cache whenever you execute a SELECT statement. When you execute a SELECT statement with AutoCache and CacheQueryResult set, the driver executes the query to the remote data and caches the results; rows that already exist are overwritten. That is, SELECT statements are used to create and refresh the cache, not to query it. Data manipulation commands are executed to the remote data as well.

To query the cached data, set the Offline property. If you need to query the cached data in an online connection, you can append #CACHE to the table name. For example:

SELECT * FROM [Account#CACHE]

 

 

Setting the Caching Database

 

When AutoCache is set, the driver caches to a simple, file-based cache. You can configure its location or cache to a different database with the following properties:

 

 

See Also

 

 

  • CacheQueryResult: Insert or update each row returned into the corresponding table in the cache.
  • Caching: Best Practices: This section provides more examples of using AutoCache with Offline, as well as information on determining a caching strategy.
  • CacheMetadata: This property reduces the amount of metadata that crosses the network by persisting table schemas retrieved from the DynamoDB metadata. Metadata then needs to be retrieved only once instead of every connection.
  • CACHE Statements: You can use the CACHE statement to persist any SELECT query, as well as manage the cache; for example, refreshing schemas.

 

 

 

Auto Detect Index

Data Type

bool

Default Value

true

Remarks

In DynamoDB, secondary indexes can be used to more quickly select data from a given table. By default, we attempt to automatically detect an index to use based on the query. However, this may not always be desirable. If you have control over the query and would prefer to specify the index yourself, set AutoDetectIndex to false and simply use the SecondaryIndex pseudo column to specify which index to use (if any).

 

 

Batch Size

Data Type

int

Default Value

0

Remarks

When BatchSize is set to a value greater than 0, the batch operation will split the entire batch into separate batches of size BatchSize. The split batches will then be submitted to the server individually. This is useful when the server has limitations on the size of the request that can be submitted.

Setting BatchSize to 0 will submit the entire batch as specified.

 

Cache Connection

Data Type

string

Default Value

""

Remarks

 

The cache database is determined based on the CacheDriver and CacheConnection properties. Both properies are required to use the cache database. Examples of common cache database settings can be found below. For more information on setting the caching database's driver, refer to CacheDriver.

The connection string specified in the CacheConnection property is passed directly to the underlying CacheDriver. Consult the documentation for the specific JDBC driver for more information on the available properties. Make sure to include the JDBC driver in your application's classpath.

 

Derby and Java DB

 

The driver simplifies caching to Derby, only requiring you to set the CacheLocation property to make a basic connection.

Alternatively, you can configure the connection to Derby manually using CacheProvider and CacheConnection. Below is the Derby JDBC URL syntax:

jdbc:derby:[subsubprotocol:][databaseName][;attribute=value[;attribute=value] ... ]
For example, to cache to an in-memory database, use the following:
jdbc:derby:memory

 

 

SQLite

 

To cache to SQLite, you can use the SQLite JDBC driver. Below is the syntax of the JDBC URL:

jdbc:sqlite:dataSource
  • Data Source: The path to an SQLite database file. Or, use a value of :memory to cache in memory.

 

 

MySQL

 

The installation includes the CData JDBC Driver for MySQL. Below is an example JDBC URL:

jdbc:mysql:User=root;Password=root;Server=localhost;Port=3306;Database=cache
Below are typical connection properties:

 

 

  • Server: The IP address or domain name of the server you want to connect to.
  • Port: The port that the server is running on.
  • User: The username provided for authentication to the database.
  • Password: The password provided for authentication to the database.
  • Database: The name of the database.
SQL Server

 

The JDBC URL for the Microsoft JDBC Driver for SQL Server has the following syntax:

jdbc:sqlserver://[serverName[\instance][:port]][;database=databaseName][;property=value[;property=value] ... ]
For example:
jdbc:sqlserver://localhost\sqlexpress:1433;integratedSecurity=true
Below are typical SQL Server connection properties:
  • Server: The name or network address of the computer running SQL Server. To connect to a named instance instead of the default instance, this property can be used to specify the host name and the instance, separated by a backslash.
  • Port: The port SQL Server is running on.
  • Database: The name of the SQL Server database.
  • Integrated Security: Set this option to true to use the current Windows account for authentication. Set this option to false if you are setting the User and Password in the connection.

    To use integrated security, you will also need to add sqljdbc_auth.dll to a folder on the Windows system path. This file is located in the auth subfolder of the Microsoft JDBC Driver for SQL Server installation. The bitness of the assembly must match the bitness of your JVM.

  • User ID: The username provided for authentication with SQL Server. Only needed if you are not using integrated security.
  • Password: The password provided for authentication with SQL Server. Only needed if you are not using integrated security.
Oracle

 

Below is the conventional JDBC URL syntax for the Oracle JDBC Thin driver:

jdbc:oracle:thin:[userId/password]@[//]host[[:port][:sid]]
For example:
jdbc:oracle:thin:scott/tiger@myhost:1521:orcl
Below are typical connection properties:
  • Data Source: The connect descriptor that identifies the Oracle database. This can be a TNS connect descriptor, an Oracle Net Services name that resolves to a connect descriptor, or, after version 11g, an Easy Connect naming (the host name of the Oracle server with an optional port and service name).

  • Password: The password provided for authentication with the Oracle database.
  • User Id: The user Id provided for authentication with the Oracle database.
PostgreSQL

 

Below is the JDBC URL syntax for the official PostgreSQL JDBC driver:

jdbc:postgresql:[//[host[:port]]/]database[[?option=value][[&option=value][&option=value] ... ]]
For example, the following connection string connects to a database on the default host (localhost) and port (5432):
jdbc:postgresql:postgres
Below are typical connection properties:
  • Host: The address of the server hosting the PostgreSQL database.
  • Port: The port used to connect to the server hosting the PostgreSQL database.
  • Database: The name of the database.
  • Username: The user Id provided for authentication with the PostgreSQL database. You can specify this in the JDBC URL with the "user" parameter.
  • Password: The password provided for authentication with the PostgreSQL database.

 

 

Cache Driver

Data Type

string

Default Value

""

Remarks

 

You can cache to any database for which you have a JDBC driver, including CData JDBC drivers.

The cache database is determined based on the CacheDriver and CacheConnection properties. The CacheDriver is the name of the JDBC driver class that you would like to use to cache data.

Note that you must also add the CacheDriver JAR to the classpath.

The following examples show how to cache to several major databases. Refer to CacheConnection for more information on the JDBC URL syntax and typical connection properties.

Derby and Java DB

 

 

The driver simplifies Derby configuration. Java DB is the Oracle distribution of Derby. The JAR is shipped in the JDK. You can find the JAR, derby.jar, in the db subfolder of the JDK installation. In most caching scenarios, you need to specify only the following, after adding derby.jar to the classpath.

jdbc:dynamodb:CacheLocation='c:/Temp/cachedir';Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;
To customize the Derby JDBC URL, use CacheDriver and CacheConnection. For example, to cache to an in-memory database, use a JDBC URL like the following:
jdbc:dynamodb:CacheDriver=org.apache.derby.jdbc.EmbeddedDriver;CacheConnection='jdbc:derby:memory';Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;
SQLite

 

Below is a JDBC URL for the SQLite JDBC driver:

jdbc:dynamodb:CacheDriver=org.sqlite.JDBC;CacheConnection='jdbc:sqlite:C:/Temp/sqlite.db';Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;
MySQL

 

Below is a JDBC URL for the included CData JDBC Driver for MySQL:

  jdbc:dynamodb:Cache Driver=cdata.jdbc.mysql.MySQLDriver;Cache Connection='jdbc:mysql:Server=localhost;Port=3306;Database=cache;User=root;Password=123456';Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;
  
The CData JDBC Driver for MySQL is located in the lib subfolder of the CData JDBC Driver for DynamoDB 2018 installation directory.
SQL Server

 

The following JDBC URL uses the Microsoft JDBC Driver for SQL Server:

jdbc:dynamodb:Cache Driver=com.microsoft.sqlserver.jdbc.SQLServerDriver;Cache Connection='jdbc:sqlserver://localhost\sqlexpress:7437;user=sa;password=123456;databaseName=Cache';Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;
Oracle

 

Below is a JDBC URL for the Oracle Thin Client:

jdbc:dynamodb:Cache Driver=oracle.jdbc.driver.OracleDriver;CacheConnection='jdbc:oracle:thin:scott/tiger@localhost:1521:orcldb';Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;
PostgreSQL

 

The following JDBC URL uses the official PostgreSQL JDBC driver:

jdbc:dynamodb:CacheDriver=org.postgresql.Driver;CacheConnection='jdbc:postgresql://localhost:5433/postgres?user=postgres&password=admin';Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;

 

 

Cache Location

Data Type

string

Default Value

""

Remarks

The CacheLocation is a simple, file-based cache. The driver uses Java DB, Oracle's distribution of the Derby database. To cache to Java DB, you will need to add the Java DB JAR to the classpath. The JAR, derby.jar, is shipped in the JDK and located in the db subfolder of the JDK installation.

CacheLocation defaults to the directory specified by the Location setting.

See Also

 

 

  • AutoCache: Set this to implicitly create and maintain a cache for later offline use.
  • CacheMetadata: Set this to persist the DynamoDB catalog in CacheLocation.

 

 

Cache Metadata

Data Type

bool

Default Value

false

Remarks

As you execute queries with this property set, table metadata in the DynamoDB catalog are cached to the file store specified by CacheLocation if set or the user's home directory otherwise. A table's metadata will be retrieved only once, when the table is queried for the first time.

When to Use CacheMetadata

 

The driver automatically persists metadata in memory for up to two hours when you first discover the metadata for a table or view and therefore, CacheMetadata is generally not required. CacheMetadata becomes useful when metadata operations are expensive such as when you are working with large amounts of metadata or when you have many short-lived connections.

When Not to Use CacheMetadata

 

 

  • When you are working with volatile metadata: Metadata for a table is only retrieved the first time the connection to the table is made. To pick up new, changed, or deleted columns, you would need to delete and rebuild the metadata cache. Therefore, it is best to rely on the in-memory caching for cases where metdata will change often.
  • When you are caching to a database: CacheMetadata can only be used with CacheLocation. If you are caching to another database with the CacheDriver and CacheConnection properties, use AutoCache to cache implicitly. Or, use CACHE Statements to cache explicitly.

 

 

Cache Query Result

Data Type

bool

Default Value

false

Remarks

When CacheQueryResult and AutoCache are set, the rows returned from a SELECT query are cached in the cache database. The driver handles caching in a streaming fashion with each row being processed into the cache database from the original result set as you read the row from the returned ResultSet object. This ensures that the live data is not queried twice. Note that any rows you do not read from the returned ResultSet will not be updated in the cache.

 

Connection Life Time

Data Type

string

Default Value

"0"

Remarks

The maximum lifetime of a connection in seconds. Once the time has elapsed, the connection object is disposed. The default is 0 which indicates there is no limit to the connection lifetime.

 

Connect On Open

Data Type

bool

Default Value

false

Remarks

When set to 'true', a connection will be made to DynamoDB when the connection is opened. This property enables the 'Test Connection' feature available in various database tools.

This feature acts as a NOOP command as it is used to verify a connection can be made to DynamoDB and nothing from this initial connection is maintained.

Setting this property to 'false' may provide performance improvements (depending upon the number of times a connection is opened).

 

Domain

Data Type

string

Default Value

"amazonaws.com"

Remarks

If you do not have a unique AWS domain name, leave this value specified as amazonaws.com.

 

 

Firewall Password

Data Type

string

Default Value

""

Remarks

This property is passed to the proxy specified by FirewallServer and FirewallPort, following the authentication method specified by FirewallType.

 

Firewall Port

Data Type

string

Default Value

""

Remarks

This specifies the TCP port for a proxy allowing traversal of a firewall. Use FirewallServer to specify the name or IP address. Specify the protocol with FirewallType.

 

Firewall Server

Data Type

string

Default Value

""

Remarks

This property specifies the IP address, DNS name, or host name of a proxy allowing traversal of a firewall. The protocol is specified by FirewallType: Use FirewallServer with this property to connect through SOCKS or do tunneling. Use ProxyServer to connect to an HTTP proxy.

Note that the driver uses the system proxy by default. To use a different proxy, set ProxyAutoDetect to false.

 

Firewall Type

Data Type

string

Default Value

"NONE"

Remarks

This property specifies the protocol that the driver will use to tunnel traffic through the FirewallServer proxy. Note that by default the driver connects to the system proxy; to disable this behavior and connect to one of the following proxy types, set ProxyAutoDetect to false.

 

   
Type Default Port Description
TUNNEL 80 When this is set, the driver opens a connection to DynamoDB and traffic flows back and forth through the proxy.
SOCKS4 1080 When this is set, the driver sends data through the SOCKS 4 proxy specified by FirewallServer and FirewallPort and passes the FirewallUser value to the proxy, which determines if the connection request should be granted.
SOCKS5 1080 When this is set, the driver sends data through the SOCKS 5 proxy specified by FirewallServer and FirewallPort. If your proxy requires authentication, set FirewallUser and FirewallPassword to credentials the proxy recognizes.

 

To connect to HTTP proxies, use ProxyServer and ProxyPort. To authenticate to HTTP proxies, use ProxyAuthScheme, ProxyUser, and ProxyPassword.

 

 

Firewall User

Data Type

string

Default Value

""

Remarks

The FirewallUser and FirewallPassword properties are used to authenticate against the proxy specified in FirewallServer and FirewallPort, following the authentication method specified in FirewallType.

 

Flatten Arrays

Data Type

string

Default Value

""

Remarks

By default, nested arrays are returned as strings of JSON. The FlattenArrays property can be used to flatten the elements of nested arrays into columns of their own. This is only recommended for arrays that are expected to be short.

Set FlattenArrays to the number of elements you want to return from nested arrays. The specified elements are returned as columns. The zero-based index is concatenated to the column name. Other elements are ignored.

For example, you can return an arbitrary number of elements from an array of strings:

["FLOW-MATIC","LISP","COBOL"]
When FlattenArrays is set to 1, the preceding array is flattened into the following table:

 

   
Column Name Column Value
languages_0 FLOW-MATIC

 

 

Flatten Objects

Data Type

bool

Default Value

true

Remarks

Set FlattenObjects to true to flatten object properties into columns of their own. Otherwise, objects nested in arrays are returned as strings of JSON. The property name is concatenated onto the object name with an underscore to generate the column name.

For example, you can flatten the nested objects below at connection time:

[
     { "grade": "A", "score": 2 },
     { "grade": "A", "score": 6 },
     { "grade": "A", "score": 10 },
     { "grade": "A", "score": 9 },
     { "grade": "B", "score": 14 }
]
When FlattenObjects is set to true and FlattenArrays is set to 1, the preceding array is flattened into the following table:

 

   
Column Name Column Value
grades_0_grade A
grades_0_score 2

 

 

Generate Schema Files

Data Type

string

Default Value

"Never"

Remarks

GenerateSchemaFiles enables you to save the table definitions identified by Automatic Schema Discovery. This property outputs schemas to .rsd files in the path specified by Location.

Available settings are the following:

  • Never: A schema file will never be generated.
  • OnUse: A schema file will be generated the first time a table is referenced, provided the schema file for the table does not already exist.
  • OnStart: A schema file will be generated at connection time for any tables that do not currently have a schema file.
Note that if you want to regenerate a file, you will first need to delete it.
Generate Schemas with SQL

 

When you set GenerateSchemaFiles to OnUse, the driver generates schemas as you execute SELECT queries. Schemas are generated for each table referenced in the query.

Generate Schemas on Connection

 

Another way to use this property is to obtain schemas for every table in your database when you connect. To do so, set GenerateSchemaFiles to OnStart and connect.

Editing Schemas

 

Schema files have a simple format that makes them easy to modify. See Custom Schema Definitions for more information.

 

Insert Mode

Data Type

string

Default Value

"REPLACE"

Remarks

If InsertMode is set to DONTREPLACE, an exception will be thrown from DynamoDB if you attempt to insert a value where the primary key combination already exists in DynamoDB. By default there will be no exception and the item in DynamoDB will be replaced by the newly inserted value.

 

 

Location

Data Type

string

Default Value

""

Remarks

The path to a directory which contains the schema files for the driver (.rsd files for tables and views, .rsb files for stored procedures). The Location property is only needed if you would like to customize definitions (e.g., change a column name, ignore a column, etc.) or extend the data model with new tables, views, or stored procedures.

The schema files are deployed alongside the driver assemblies. You must also ensure that Location points to the folder that contains the schema files. The folder location can be a relative path from the location of the executable.

 

Logfile

Data Type

string

Default Value

""

Remarks

For more control over what is written to the log file, take a look at Verbosity.

 

Maximum Request Retries

Data Type

string

Default Value

""

Remarks

MaximumRequestRetries is the maximum number of times the driver will retry a request when the problem has been detected as temporary (errors like "unknown error", network issues, and exceeding the maximum threshold per table). In this case on the first retry the driver will back off and wait for the amount of time designated by RetryWaitTime. If that request fails, the driver will double the time and then double again until the driver has exhausted the available retries.

For example, if RetryWaitTime is set to 2 seconds and MaximumRequestRetries is set to 5, the wait times will be as follows: 0 -> 2 -> 4 -> 8 -> 16 -> 32.

 

Max Log File Size

Data Type

string

Default Value

"100MB"

Remarks

A string specifying the maximum size in bytes for a log file (ex: 10MB). When the limit is hit, a new log is created in the same folder with the date and time appended to the end. The default limit is 100MB. Values lower than 100kB will use 100kB as the value instead.

 

Max Rows

Data Type

string

Default Value

"-1"

Remarks

Limits the number of rows returned rows when no aggregation or group by is used in the query. This helps avoid performance issues at design time.

 

MFA Serial Number

Data Type

string

Default Value

""

Remarks

You can find the device for an IAM user by going to the AWS Management Console and viewing the user's security credentials. For virtual devices, this is actually an Amazon Resource Name (such as arn:aws:iam::123456789012:mfa/user).

 

MFA Token

Data Type

string

Default Value

""

Remarks

If MFA is required, this value will be used along with the MFASerialNumber to retrieve temporary credentials to login. The temporary credentials available from AWS will only last up to 1 hour. Once the time is up, the connection must be updated to specify a new MFA token so that new credentials may be obtained.

 

Number Column Mode

Data Type

string

Default Value

"DOUBLE"

Remarks

By default, all numbers will be specified as double. However, depending on your needs, you may wish to handle number columns as either double or decimal. In addition, you can also set the value to string to report all number columns as strings if you are using the CData JDBC Driver for DynamoDB 2018 in an environment that cannot handle the maximum precision size of DynamoDB.

 

 

Offline

Data Type

bool

Default Value

false

Remarks

When Offline is set to TRUE, all queries execute against the cache as opposed to the live data source. In this mode, certain queries like INSERT, UPDATE, DELETE, and CACHE are not allowed.

 

Other

Data Type

string

Default Value

""

Remarks

The properties listed below are available for specific use cases. Normal driver use cases and functionality should not require these properties.

Specify multiple properties in a semicolon-separated list.

Caching Configuration

 

   
CachePartial=True Caches only a subset of columns, which you can specify in your query.
QueryPassthrough=True Passes the specified query to the cache database instead of using the SQL parser of the driver.

 

Integration and Formatting

 

   
DefaultColumnSize Sets the default length of string fields when the data source does not provide column length in the metadata. The default value is 2000.
ConvertDateTimeToGMT Whether to convert date-time values to GMT, instead of the local time of the machine.
RecordToFile=filename Records the underlying socket data transfer to the specified file.

 

 

Pagesize

Data Type

string

Default Value

""

Remarks

The Pagesize property affects the maximum number of results to return per page from DynamoDB. By default, DynamoDB will return up to 1MB of data per page. The Pagesize indicates the maximum number of items to return per page. DynamoDB may return fewer than this number if the total size of the items exceeds 1MB before hitting it.

 

Pool Idle Timeout

Data Type

string

Default Value

""

Remarks

The allowed idle time a connection can remain in the pool until the connection is closed. The default is 60 seconds.

 

Pool Max Size

Data Type

string

Default Value

"100"

Remarks

The maximum connections in the pool. The default is 100. To disable this property, set the property value to 0 or less.

 

Pool Min Size

Data Type

string

Default Value

"1"

Remarks

The minimum number of connections in the pool. The default is 1.

 

Pool Wait Time

Data Type

string

Default Value

""

Remarks

The max seconds to wait for a connection to become available. If a new connection request is waiting for an available connection and exceeds this time, an error is thrown. By default, new requests wait forever for an available connection.

 

Proxy Auth Scheme

Data Type

string

Default Value

"BASIC"

Remarks

This value specifies the authentication type to use to authenticate to the HTTP proxy specified by ProxyServer and ProxyPort.

Note that the driver will use the system proxy settings by default, without further configuration needed; if you want to connect to another proxy, you will need to set ProxyAutoDetect to false, in addition to ProxyServer and ProxyPort. To authenticate, set ProxyAuthScheme and set ProxyUser and ProxyPassword, if needed.

The authentication type can be one of the following:

  • BASIC: The driver performs HTTP BASIC authentication.
  • DIGEST: The driver performs HTTP DIGEST authentication.
  • NEGOTIATE: The driver retrieves an NTLM or Kerberos token based on the applicable protocol for authentication.
  • PROPRIETARY: The driver does not generate an NTLM or Kerberos token. You must supply this token in the Authorization header of the HTTP request.
If you need to use another authentication type, such as SOCKS 5 authentication, see FirewallType.

 

 

Proxy Auto Detect

Data Type

bool

Default Value

true

Remarks

By default, the driver uses the system HTTP proxy. Set this to false if you want to connect to another proxy.

To connect to an HTTP proxy, see ProxyServer.

For other proxies, such as SOCKS or tunneling, see FirewallType.

 

Proxy Exceptions

Data Type

string

Default Value

""

Remarks

The ProxyServer will be used for all addresses, except for addresses defined in this property. Use semicolons to separate entries.

Note that the driver will use the system proxy settings by default, without further configuration needed; if you want to explicitly configure proxy exceptions for this connection, you will need to set ProxyAutoDetect to false, and configure ProxyServer and ProxyPort. To authenticate, set ProxyAuthScheme and set ProxyUser and ProxyPassword, if needed.

 

Proxy Password

Data Type

string

Default Value

""

Remarks

This property is used to authenticate to an HTTP proxy server that supports NTLM (Windows), Kerberos, or HTTP authentication. To specify the HTTP proxy, you can set ProxyServer and ProxyPort. To specify the authentication type, set ProxyAuthScheme.

If you are using HTTP authentication, additionally set ProxyUser and ProxyPassword to HTTP proxy.

If you are using NTLM authentication, set ProxyUser and ProxyPassword to your Windows password. You may also need these to complete Kerberos authentication.

For SOCKS 5 authentication or tunneling, see FirewallType.

By default, the driver uses the system proxy. If you want to connect to another proxy, set ProxyAutoDetect to false.

 

Proxy Port

Data Type

string

Default Value

"80"

Remarks

The port the HTTP proxy is running on that you want to redirect HTTP traffic through. Specify the HTTP proxy in ProxyServer. For other proxy types, see FirewallType.

 

Proxy Server

Data Type

string

Default Value

""

Remarks

The hostname or IP address of a proxy to route HTTP traffic through. The driver can use the HTTP, Windows (NTLM), or Kerberos authentication types to authenticate to an HTTP proxy.

If you need to connect through a SOCKS proxy or tunnel the connection, see FirewallType.

By default, the driver uses the system proxy. If you need to use another proxy, set ProxyAutoDetect to false.

 

Proxy SSL Type

Data Type

string

Default Value

"AUTO"

Remarks

This property determines when to use SSL for the connection to an HTTP proxy specified by ProxyServer. This value can be AUTO, ALWAYS, NEVER, or TUNNEL. The applicable values are the following:

 

   
AUTO Default setting. If the URL is an HTTPS URL, the driver will use the TUNNEL option. If the URL is an HTTP URL, the component will use the NEVER option.
ALWAYS The connection is always SSL enabled.
NEVER The connection is not SSL enabled.
TUNNEL The connection is through a tunneling proxy: The proxy server opens a connection to the remote host and traffic flows back and forth through the proxy.

 

 

Proxy User

Data Type

string

Default Value

""

Remarks

The ProxyUser and ProxyPassword options are used to connect and authenticate against the HTTP proxy specified in ProxyServer.

You can select one of the available authentication types in ProxyAuthScheme. If you are using HTTP authentication, set this to the username of a user recognized by the HTTP proxy. If you are using Windows or Kerberos authentication, set this property to a username in one of the following formats:

user@domain
domain\user

 

 

Pseudo Columns

Data Type

string

Default Value

""

Remarks

This setting is particularly helpful in Entity Framework, which does not allow you to set a value for a pseudo column unless it is a table column. The value of this connection setting is of the format "Table1=Column1, Table1=Column2, Table2=Column3". You can use the "*" character to include all tables and all columns; i.e., "*=*".

 

Readonly

Data Type

bool

Default Value

false

Remarks

If this property is set to true, the driver will allow only SELECT queries. INSERT, UPDATE, DELETE, and stored procedure queries will cause an error to be thrown.

 

Region

Data Type

string

Default Value

"NORTHERNVIRGINIA"

Remarks

The hosting region for your Amazon Web Services. Available values are NORTHERNVIRGINIA, OHIO, NORTHERNCALIFORNIA, OREGON, CENTRAL, IRELAND, FRANKFURT, LONDON, SINGAPORE, SYDNEY, SEOUL, TOKYO, MUMBAI, SAOPAULO, PARIS, NIGXIA, OSAKA-LOCAL and BEIJING.

 

 

Retry Wait Time

Data Type

string

Default Value

""

Remarks

The value of this property is doubled on every retry to determine how long to wait until the next retry. Specify the maximum number of retries with MaximumRequestRetries.

 

Role ARN

Data Type

string

Default Value

""

Remarks

When authenticating outside of AWS, it is common to use a Role for authentication instead of your direct AWS account credentials. Entering the RoleARN will cause the CData JDBC Driver for DynamoDB 2018 to perform a role based authentication instead of using the AccessKey and SecretKey directly. The AccessKey and SecretKey must still be specified to perform this authentication. You cannot use the credentials of an AWS root user when setting RoleARN. The AccessKey and SecretKey must be those of an IAM user.

 

Row Scan Depth

Data Type

string

Default Value

"50"

Remarks

Since DynamoDB is schemaless, the columns in a table must be determined by scanning table rows. This value determines the maximum number of rows that will be scanned.

See Table Columns for more details on the types discovered and how to define a static schema instead, an alternative that gives you more control over the projected columns.

 

RTK

Data Type

string

Default Value

""

Remarks

 

The RTK property may be used to license a build. Please see the included licensing file to see how to set this property. The runtime key is only available if you purchased an OEM license.

 

Secret Key

Data Type

string

Default Value

""

Remarks

Your AWS account secret key. This value is accessible from your AWS security credentials page:

  1. Sign into the AWS Management console with the credentials for your root account.
  2. Select your account name or number and select My Security Credentials in the menu that is displayed.
  3. Click Continue to Security Credentials and expand the Access Keys section to manage or create root account access keys.

 

 

 

Separator Character

Data Type

string

Default Value

"."

Remarks

In order to flatten out structures such as Maps and List attributes in DynamoDB, we need some specifier that states what the separation is between those columns and other columns. If this value is "." and a column comes back with the name address.city, this indicates that there is a mapped attribute with a child called city. If your data has columns that already use a single period within the attribute name, set the SeparatorCharacter to a different character or characters.

 

SSL Server Cert

Data Type

string

Default Value

""

Remarks

If using a TLS/SSL connection, this property can be used to specify the TLS/SSL certificate to be accepted from the server. Any other certificate that is not trusted by the machine will be rejected.

This property can take the forms:

 

   
Description Example
A full PEM Certificate (example shortened for brevity) -----BEGIN CERTIFICATE----- MIIChTCCAe4CAQAwDQYJKoZIhv......Qw== -----END CERTIFICATE-----
A path to a local file containing the certificate C:\cert.cer
The public key (example shortened for brevity) -----BEGIN RSA PUBLIC KEY----- MIGfMA0GCSq......AQAB -----END RSA PUBLIC KEY-----
The MD5 Thumbprint (hex values can also be either space or colon separated) ecadbdda5a1529c58a1e9e09828d70e4
The SHA1 Thumbprint (hex values can also be either space or colon separated) 34a929226ae0819f2ec14b4a3d904f801cbb150d

 

If not specified, any certificate trusted by the machine will be accepted. Use '*' to signify to accept all certificates (not recommended for security concerns).

 

Support Enhanced SQL

Data Type

bool

Default Value

true

Remarks

Use QueryCache to cache memory for a given time in seconds or to disable in-memory caching.

When SupportEnhancedSQL is set to true, the driver offloads as much of the SELECT statement processing as possible to DynamoDB and then processes the rest of the query in memory. In this way the driver can execute unsupported predicates, joins, and aggregation.

When SupportEnhancedSQL is set to false, the driver limits SQL execution to what is supported by the DynamoDB API.

Execution of Predicates

 

The driver determines which of the clauses are supported by the data source and then pushes them to the source to get the smallest superset of rows that would satisfy the query. It then filters the rest of the rows locally. The filter operation is streamed, which enables the driver to filter effectively for even very large datasets.

Execution of Joins

 

The driver uses various techniques to join in memory. The driver trades off memory utilization against the requirement of reading the same table more than once.

Execution of Aggregates

 

The driver retrieves all rows necessary to process the aggregation in memory.

 

Tables

Data Type

string

Default Value

""

Remarks

Listing the tables from some databases can be expensive. Providing a list of tables in the connection string improves the performance of the driver.

This property can also be used as an alternative to automatically listing views if you already know which ones you want to work with and there would otherwise be too many to work with.

Specify the tables you want in a comma-separated list. For example: Tables=TableA,TableB,TableC

 

Temporary Token Duration

Data Type

string

Default Value

"3600"

Remarks

Temporary tokens are used with both MFA and Role based authentication. Temporary tokens will eventually time out, at which time a new temporary token must be obtained. For situations where MFA is not used, this is not a big deal. The CData JDBC Driver for DynamoDB 2018 will internally request a new temporary token once the temporary token has expired.

However, for MFA required connection, a new MFAToken must be specified in the connection to retrieve a new temporary token. This is a more intrusive issue since it requires an update to the connection by the user. The maximum and minimum that can be specified will depend largely on the connection being used.

For Role based authentication, the minimum duration is 900 seconds (15 minutes) while the maximum if 3600 (1 hour). Even if MFA is used with role based authentication, 3600 is still the maximum.

For MFA authentication by itself (using an IAM User or root user), the minimum is 900 seconds (15 minutes), the maximum is 129600 (36 hours).

 

Thread Count

Data Type

string

Default Value

"4"

Remarks

Parallel scans allow data to be retrieved faster by splitting up the retrieval process across multiple threads. This can greatly improve performance when scanning data in DynamoDB. However, this will also consume your read units for a table much faster than a single thread. Consider your available cores, bandwidth, and read units for your tables before increasing the ThreadCount.

 

Timeout

Data Type

string

Default Value

"60"

Remarks

If the Timeout property is set to 0, operations do not time out: They run until they complete successfully or encounter an error condition.

If Timeout expires and the operation is not yet complete, the driver throws an exception.

 

Type Detection Scheme

Data Type

string

Default Value

""

Remarks

 

 

   
None Setting TypeDetectionScheme to None will return all columns as string type. Note: Even when set to None, the column names will still be scanned when Header=True.
RowScan Setting TypeDetectionScheme to RowScan will scan rows to heuristically determine the data type. The RowScanDepth determines the number of rows to be scanned. If no value is specified, RowScan will be used by default.

 

 

Url

Data Type

string

Default Value

""

Remarks

 

The URL will normally be determined automatically based on your Region and Domain. However, you can optionally specify the URL as an override. For instance, this can work for connecting to Local DynamoDB.

 

 

Use Connection Pooling

Data Type

bool

Default Value

false

Remarks

Enables connection pooling. The default is false. See Connection Pooling for information on using connection pools.

 

Use EC2 Roles

Data Type

bool

Default Value

false

Remarks

This property takes advantage of using EC2 roles. If the CData JDBC Driver for DynamoDB 2018 is running on an EC2 instance and the instance has an IAM Role assigned to it, the role can be used without any other credentials specified. When UseEC2Roles is set to true, other authentication credentials will be ignored. This connection property should not be used when connecting from outside of an EC2 instance.

 

Use Simple Names

Data Type

bool

Default Value

false

Remarks

Boolean determining if simple names should be used for tables and columns. DynamoDB tables and columns can use special characters in names that are normally not allowed in standard databases. UseSimpleNames makes the driver easier to use with traditional database tools.

Setting UseSimpleNames to true will simplify the names of tables and columns returned. It will enforce a naming scheme such that only alphanumeric characters and the underscore are valid for displayed table and column names. Any non-alphanumeric characters will be converted to an underscore.

 

Verbosity

Data Type

string

Default Value

"1"

Remarks

The verbosity level determines the amount of detail that the driver reports to the Logfile. Verbosity levels from 1 to 5 are supported. These are described below:

 

   
1 Setting Verbosity to 1 will log the query, the number of rows returned by it, the start of execution and the time taken, and any errors.
2 Setting Verbosity to 2 will log everything included in Verbosity 1, cache queries, and additional information about the request, if applicable, such as HTTP headers.
3 Setting Verbosity to 3 will additionally log the body of the request and the response.
4 Setting Verbosity to 4 will additionally log transport-level communication with the data source. This includes SSL negotiation.
5 Setting Verbosity to 5 will additionally log communication with the data source and additional details that may be helpful in troubleshooting problems. This includes interface commands.

The Verbosity should not be set to greater than 1 for normal operation. Substantial amounts of data can be logged at higher verbosities, which can delay execution times.

 

Views

Data Type

string

Default Value

""

Remarks

Listing the views from some databases can be expensive. Providing a list of views in the connection string improves the performance of the driver.

This property can also be used as an alternative to automatically listing views if you already know which ones you want to work with and there would otherwise be too many to work with.

Specify the views you want in a comma-separated list. For example: For example: Views=ViewsA,ViewsB,ViewsC