Simba ODBC Driver with SQL Connector for Apache Cassandra

Transcription

1 Simba ODBC Driver with SQL Connector for Apache Cassandra The release notes provide details of enhancements and features in Simba ODBC Driver with SQL Connector for Apache Cassandra , as well as the version history. The following are highlights of the new features and functionalities that have been added to Simba ODBC Driver with SQL Connector for Apache Cassandra Cassandra client API 1.0 GA now being used The driver now uses the 1.0 GA version of the Cassandra client API. Known Issues The following are known issues and limitations in Simba ODBC Driver with SQL Connector for Apache Cassandra Counter columns cannot be updated The driver is unable to update counter columns. Cassandra 1.2 is not supported The driver does not support Cassandra 1.2. When using Informatica PowerCenter Express, exporting DOUBLE/FLOAT data to a flat file returns incorrect data When you export DOUBLE/FLOAT data to a flat file in Informatica PowerCenter Express, the returned data has fewer decimal digits. As a workaround, move this data from one table to another without the flat file. 1

2 Version History Version ODBC Driver with SQL Connector for Apache Cassandra Cassandra client API beta 5 now being used The driver now uses the beta 5 version of the Cassandra client API, instead of beta 3. Support added for ODBC 3.80 Version The driver now supports ODBC Cassandra When you insert DOUBLE data into a table, the inserted data is corrupted Version DOUBLE data can now be correctly inserted into tables. Cassandra When a prepared query has a WHERE clause that contains a parameter, and the parameter has been bound multiple times, the query returns an error Version ODBC Driver with SQL Connector for Apache Cassandra

3 Separator for virtual table names now configurable You can now specify the separator to be used in virtual table names by using the "Virtual table name separator" option (the VTTableNameSeparator key). The default separator is _vt_ The name of a virtual table consists of the name of the original table, then the separator, and then the name of the collection from which the virtual table was built. For example: OriginalTable_vt_CollectionName Support added for the "Show Default Schema Only" option in Informatica Developer Version When using the driver in Informatica Developer, you can now use the "Show Default Schema Only" option in the Connection Explorer. ODBC Driver with SQL Connector for Apache Cassandra Data consistency can now be configured through the driver You can now specify a particular replica or the number of replicas that must process a query in order for the query to be considered successful. To configure this feature, use the "Tunable Consistency" configuration option (the TunableConsistency key). Large result sets can now be split into pages Version You can now configure the driver to split large result sets into pages. To configure this feature, use the Enable Paging check box (the EnablePaging key) and the Rows Per Page field (the RowsPerPage key). ODBC Driver with SQL Connector for Apache Cassandra User Name and Password authentication added You can now configure the driver to request user login when accessing a Cassandra server. 3

4 Host connection attribute can now accept multiple servers You can now specify a comma-separated list of IP addresses or hostnames in the Host attribute instead of specifying one server in the Host attribute and then specifying the rest in the SecondaryHosts attribute. The SecondaryHosts attribute is no longer available. The driver will attempt to connect to all the servers concurrently, and then keep the first connection that is successfully established. The driver does not maintain a connection with any of the other servers in the list. Support added for non-ascii Cassandra identifiers You can now use non-ascii Cassandra identifiers. Optimized filter passdown Optimizations for filter passdown functionalities have been implemented. Updated virtual table name delimiter The delimiter for virtual table names has been changed from _vt_ to #vt_ Cassandra The Linux version of the driver does not insert TIMESTAMP data correctly Driver does not detect changes made to the table schema or tables that were created or deleted after the connection was established If you create or delete a table or change the table schema after establishing the connection, the driver is now able to detect these changes. Collections cannot be displayed when the driver uses CQL_QUERY_MODE You can now retrieve collection columns in CQL_QUERY_MODE. Collection column data is returned as strings. Case-sensitive Cassandra identifiers are not handled correctly Virtual tables do not show foreign keys metadata correctly 4

5 Version Cassandra Version IPv6 data is not retrieved correctly Cassandra When writing a large amount of data to Cassandra, the driver returns the error message "Batch with conditions cannot span multiple partitions" When writing a large amount of data to Cassandra, the driver returns the error message "Cannot achieve consistency level QUORUM" Query fails to execute when the SQL statement does not use any column references In the Windows version of the driver, the length of INET data is not reported correctly, causing equality filters to fail Version When the connection fails, the driver terminates unexpectedly Cassandra

6 Version The default query mode is not SQL to CQL fallback The driver now uses the SQL to CQL fallback query mode by default. In some cases, TIMESTAMP values are not correctly written or retrieved The TRUNCATE TABLE query returns an error The CREATE/DROP TABLE query returns an error Catalog names are not case-sensitive Catalog names are now case-sensitive. INET and UUID data types are not correctly written to Cassandra The driver fails to delete all the data from large virtual and non-virtual tables You can now delete all the data from large tables. Cassandra Version When retrieving the primary keys of a table, a memory allocation error occurs ODBC Driver with SQL Connector for Apache Cassandra

7 SQLForeignKeys supported for virtual and non-virtual tables You can now use SQLForeignKeys in virtual and non-virtual tables. UPDATE and DELETE statements supported for virtual and non-virtual tables You can now use the UPDATE and DELETE statements on virtual and non-virtual tables. List index columns marked as non-nullable List index columns are now marked as non-nullable. Support added for inserting or updating data at a specific position in a list You can now specify the position in a list in which to insert or update data by writing to the _index column. Cassandra The driver fails to connect when there is a table with a clustering key in descending order Column order is sometimes inconsistent with the order displayed by cqlsh The issue occurred when the name of the primary key column was not alphabetically the first column name. The driver may terminate unexpectedly when a collection column contains multiple null or empty values Version The issue occurred when a collection column had several rows where the collection value was null or empty. ODBC Driver with SQL Connector for Apache Cassandra Support added for Cassandra 2.0 The driver now supports Cassandra

8 Virtual tables feature added To support the renormalization of collections, the driver is now able to create virtual tables from list, set, and map columns inside the Cassandra database. Virtual tables allow you to select and insert data as if the data was stored in SQL format. If you insert data into a list at index number -1, the data is appended to the list. If you insert data into a set or map, the data is inserted based on the default ordering in Cassandra. 8

9 Contact Us If you have difficulty using the driver, please contact our Technical Support staff. We welcome your questions, comments and feature requests. Technical Support is available Monday to Friday from 8 a.m. to 5 p.m. Pacific Time. Important: To help us assist you, prior to contacting Technical Support please prepare a detailed summary of the client and server environment including operating system, product version, patch level and configuration. You can contact Technical Support via: support@simba.com Web site: Telephone: (604) Extension 3 Fax: (604) You can also follow us on 9