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A savepoint is a way of implementing subtransactions (also known as nested transactions) within a relational database management system by indicating a point within a transaction that can be "rolled back to" without affecting any work done in the transaction before the savepoint was created. Multiple savepoints can exist within a single ...
In SQL, you can alias tables and columns. A table alias is called a correlation name, according to the SQL standard. [1] A programmer can use an alias to temporarily assign another name to a table or column for the duration of the current SELECT query. Assigning an alias does not actually rename the column or table.
To find the Name for ID 13, an index on (ID) is useful, but the record must still be read to get the Name. However, an index on (ID, Name) contains the required data field and eliminates the need to look up the record. Covering indexes are each for a specific table. Queries which JOIN/ access across multiple tables, may potentially consider ...
The SQL Access Group (SAG) was a group of software companies that was formed in 1989 to define and promote standards for database portability and interoperability. Initial members were Oracle Corporation , Informix , Ingres , DEC , Tandem , Sun and HP .
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
In relational algebra, a rename is a unary operation written as / where: R is a relation; a and b are attribute names; b is an attribute of R; The result is identical to R except that the b attribute in all tuples is renamed to a. [1]
The rename file must have a read port for every input of every instruction renamed every cycle, and a write port for every output of every instruction renamed every cycle. Because the size of a register file generally grows as the square of the number of ports, the rename file is usually physically large and consumes significant power.
In relational database management systems and in the particular context of an Oracle Enterprise Manager (OEM) environment, an Oracle Management Server (OMS) is a software system that functions as a middle tier between Oracle intelligent agents and Oracle management consoles.