Global Catalog - Federated Database - Database - Precise Answer
✔✔Directory of participating database objects (tables, columns,
indexesw)
Global Query Processor - Federated Database - Database - Precise
Answer ✔✔Decomposes a federated query into queries for each
participating database
Database Wrapper - Federated Database - Database - Precise Answer
✔✔Converts decomposed queries to the appropriate syntax for each
participating database
Nickname - Federated Database - Database - Precise Answer
✔✔Federated database name for a participating database object (tables
& columns)
User Mapping - Federated Database - Database - Precise Answer
✔✔Associates a federated database user with a participating database
user
Query - Databases - Precise Answer ✔✔Request to retrieve or change
data in a database
, CAP - Database - Precise Answer ✔✔Cannot simultaneously be:
Consistent (conforms to all rules at all times, Available (nodes must
respond to queries at all times), Partition-Tolerant (database functions
when network partition occurs)
Replica - Database - Precise Answer ✔✔Copy of entire database; high
availability, fast concurrent reads, local reads, slow updates
Database Application - Databases - Precise Answer ✔✔Software that
helps business users interact with database systems
Performance - File & Database Systems Shared by Many Users - Precise
Answer ✔✔When many users & applications simultaneously access
large databases, query response time degrades rapidly
Authorization - File & Database Systems Shared by Many Users -
Precise Answer ✔✔Many database users should have limited access to
specific tables, columns, or rows of database
Security - File & Database Systems Shared by Many Users - Precise
Answer ✔✔Database systems ensure authorized users only access
permissible data
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