When Database Systems Meet the Grid pot

... so reluctant to use database technologies. As stated in the introduction, although the potential benefits of using database systems on the Grid has been recognized [16], their actual use as ... area because the database scans the areas using high-speed sequential access and spatial indices rather than keeping all the data in the RAM. The SQL application does...

Ngày tải lên: 30/03/2014, 13:20

... link is the same as the global name of the database to which the link points. For example, the following SQL statement creates a database link in the local database that describes a path to the remote SALES.US.AMERICAS.ACME_AUTO.COM ... database access. Databases and Database Links Each database in a distributed database is distinct from all other databases in the...

Ngày tải lên: 07/03/2014, 23:20

... search with the data key a as the prefix. Among the found entries, the one that has the latest timestamp contains the pointer to the current version of the data record in the log. The ability ... of the record as the prefix and the times- tamp as the suffix. P tr is the offset that points to the location of a data record in the log, which includes three informat...

Ngày tải lên: 16/03/2014, 16:20

Ngày tải lên: 24/12/2013, 12:17

Ngày tải lên: 24/12/2013, 12:17

Ngày tải lên: 24/12/2013, 12:17

Ngày tải lên: 24/12/2013, 12:17

... happens if there is a failure after line (14); perhaps the computer fails or the network connecting the database to the processor that is actually performing the transfer fails. Then the database ... of the database, the trigger creator must have the necessary privileges for those actions. When someone performs an activity that awakens the trigger, they do not ne...

Ngày tải lên: 21/01/2014, 18:20

... large-scale database systems will manage their data directly on the disk. These systems are limited in size only by the amount of data that can be stored on all the disks and other storage ... Initially, the first block of the file is copied into the buffer. When the application program has consumed those 4K bytes of the file, the next block of the file is bro...

Ngày tải lên: 21/01/2014, 18:20

... room for the inserted record in the block at hand, then we simply slide the records within the block and adjust the pointers in the offset table. The new record is inserted into the block, ... having to retrieve the block containing the record. The fact that K exists in the dense index is enough to guarantee the existence of the record with key I(. On th...

Ngày tải lên: 21/01/2014, 18:20