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SQL programmingYou can use the HCL OneDB™ implementation of the SQL language to develop applications for HCL OneDB™ database servers.
Guide to SQL: SyntaxThe HCL OneDB™ Guide to SQL: Syntax describes the syntax of the statements, data types, expressions, operators, and built-in functions of the HCL OneDB™ dialect of the SQL language.
SQL statementsThis chapter describes the syntax and semantics of SQL statements that are recognized by HCL OneDB™.
ALTER FRAGMENT statementUse the ALTER FRAGMENT statement to change the distribution strategy or the storage location of an existing table or index. This statement is an extension to the ANSI/ISO standard for the SQL language.
ALTER FRAGMENT and Transaction Logging

ALTER FRAGMENT and Transaction Logging

If your database supports transaction logging, ALTER FRAGMENT is executed within a single transaction. If the fragmentation strategy uses large numbers of records, you might run out of log space or disk space. (To alter a fragmentation strategy, the database server requires extra disk space that it later frees.)

If you run out of log space or disk space, try one of the following procedures to reduce your log-space or disk-space requirements:

Turn off logging and turn it back on again at the end of the operation. This procedure indirectly requires a backup of the root dbspace.
Split the operations into multiple ALTER FRAGMENT statements, moving a smaller portion of records each time.

For information about log-space requirements and disk-space requirements, see your HCL OneDB™ Administrator's Guide. That guide also contains detailed instructions about how to turn off logging. For information about backups, refer to your HCL OneDB Backup and Restore Guide.

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