Basic text search requirements and restrictions
When you plan how to configure basic text searching, you must understand the requirements and restrictions.
- Database server requirement
The Scheduler must be running in the database server. If the Scheduler is not running when you create a bts index, a message that the access method is not found is returned.
- Database requirements
The database that contains the bts index must be logged and must not be an ANSI database. If you attempt to create a bts index in an unlogged or ANSI database, the message
DataBlade registration failed
is printed in the database server message log.- Data type support
To use basic text searching, you must store the text data in a column of data type BLOB, BSON, CHAR, CLOB, JSON, LVARCHAR, NCHAR, NVARCHAR, or VARCHAR.
To use basic text searching, you must store the text data in a column of data type BLOB, CHAR, CLOB, LVARCHAR, NCHAR, NVARCHAR, or VARCHAR.
Although you can store searchable text in a column of the BLOB data type, you cannot create a basic text search index on binary data. BLOB data type columns must contain text.
- Locales and languages support
Basic text search queries can use most multi-byte character sets and global language support, including UTF-8, and can use ideographic languages such as Chinese, Korean, and Japanese if you specify the CJK analyzer.
Important: If you use UTF-8 character encoding, including the Chinese GB18030-2000 code set, you must set the GL_USEGLU environment variable before you create the database.JSON or BSON documents must be in a database with a UTF-8 locale.
- High availability support
You can run basic text search queries on primary and all types of secondary servers in high-availability clusters.
- Index characteristics restrictions
- The following characteristics are not supported for bts indexes:
- Fill factors
- Index clustering
- Unique indexes
- Indexed document restrictions
If your documents are over 32 KB, store them in columns of type BLOB or CLOB.
The size of a document that you want to index is limited by the amount of available virtual memory on your machine. For example, if you have 1 GB of available virtual memory, you can only index documents that are smaller than 1 GB.
- Query restrictions
You cannot include basic text search queries in distributed queries or parallel database queries.