摘要:
The present invention specifies database security at a row level and, optionally, at a column and table level. The systems and methods cluster one or more sets of rows with similar security characteristics and treat them as a named expression, wherein clustered data is accessed based on associated row-level security. The systems and methods specify a syntax that invokes row(s), column(s) and/or table(s) security via programming statements. Such statements include arbitrary Boolean expressions (predicates) defined over, but not restricted to table columns and/or other contextual data. These statements typically are associated with query initiators, incorporated into queries therefrom, and utilized while querying data. Rows of data that return “true” when evaluated against an aggregate of associated security expressions are said to “satisfy” the security expressions and enable access to the data stored therein. Such security expressions can be created and invoked via the Structured Query Language (SQL) database programming language.
摘要:
This invention provides a method and apparatus for loading data having a predetermined order of data records from a source into a database using parallel processing. Using one or more reading agents, data records are read from the source in which they are stored. These data records are stored in groups of records. Each group of stored records are tagged with a sequence identifier corresponding to the predetermined order of data. Apparatus is provided for formatting the data records in the groups using a plurality of formatting agents in parallel. The formatted records are stored in formatted record groups. Sequence identifiers are written for each of the groups to the respective formatted record group. A record identification apparatus is provided for assigning page locations for the records using the sequence identifiers to maintain the predetermined order.