Runtime data persistency for in-memory database systems

A computer-implemented system for in-memory persistent runtime data within a database system, the computer-implemented system comprising:

• one or more data processors;
• and
• memory storing instructions which, when executed by the one or more data processors, result in operations comprising:
• receiving a query by at least one data processor of a database system, the database system including a table container, the table container storing data and metadata in pages organized in one or more page chains;
• determining whether the query includes a data definition statement that updates or changes in-memory runtime data;
• in response to the determining that the query includes a data definition statement, copying the in-memory runtime data to a persistent volume, the persistent volume being configured to be accessed by the database system;
• wherein:
• the in-memory runtime data includes one or more first data fields comprising persistent data fields and one or more second data fields comprising non-persistent data fields, the one or more first data fields being different from the one or more second data fields;
• and
• the table container includes a first persistent runtime data descriptor that is associated with the persistent data fields and persists the one or more second data fields by copying each field of the non-persistent data fields to a field associated with the persistent runtime data descriptor.

A non-transitory computer program product for in-memory persistent runtime data within a database system, the non-transitory computer program product storing instructions which, when executed by one or more data processors of one or more computing devices, cause at least one data processor to perform operations comprising:

• receiving a query by at least one data processor of a database system, the database system including a table container, the table container storing data and metadata in pages organized in one or more page chains;
• determining whether the query includes a data definition statement that updates or changes in-memory runtime data;
• in response to the determining that the query includes a data definition statement, copying the in-memory runtime data to a persistent volume, the persistent volume being configured to be accessed by the database system;
• wherein:
• the in-memory runtime data includes one or more first data fields comprising persistent data fields and one or more second data fields comprising non-persistent data fields, the one or more first data fields being different from the one or more second data fields;
• the table container includes a persistent runtime data descriptor that is associated with the persistent data fields and persists the one or more second data fields by copying each field of the non-persistent data fields to a field associated with the persistent runtime data descriptor;
• and
• the query is defined in at least one of a multidimensional query language, a graph query and manipulation language, or a structure query language.