GV$ and V$ Views

TimesTen provides several views that are prefixed with GV$ and V$. These views are supported in TimesTen Scaleout and TimesTen Classic. For most V$ views, there is a corresponding GV$ view.

In TimesTen Scaleout:

  • The GV$ views contain the contents of the V$ view for every element of the database.

  • The V$ views contain data for the element to which your application is connected.

In TimesTen Classic:

  • The GV$ views contain the same contents as their corresponding V$ view.

  • The V$ views contain rows of data for the database to which your application is connected.

For example, assume you want to query the GV$ and V$BLOCK_INFO system views for information on blocks and fragmentation.

In TimesTen Scaleout:

  • When you query the GV$BLOCK_INFO view, TimesTen returns the contents of the V$BLOCK_INFO contents for every element in the database. In this example, there are 6 elements, so TimesTen returns data for each of these 6 elements. 

    Command> SELECT * FROM GV$BLOCK_INFO;
 
TOTALBLOCKS, FREEBLOCKS, FREEBYTES, LARGESTFREE, ELEMENTID
< 1549, 11, 235753720, 235717496, 1 >
< 1548, 17, 235789368, 235728984, 3 >
< 1547, 14, 235883704, 235855096, 5 >
< 1549, 13, 235786520, 235762712, 2 >
< 1548, 13, 235851352, 235827960, 6 >
< 1544, 13, 235886264, 235851960, 4 >
6 rows found.

  • When you query the V$BLOCK_INFO view, TimesTen returns data for the element to which your application is connected (the local element). In this example, the local element is 1.

    Before running the query, run the set columnlabels on ttIsql command to display the column headers. 

    Command> set columnlabels on;
Command> SELECT * FROM V$BLOCK_INFO;
 
TOTALBLOCKS, FREEBLOCKS, FREEBYTES, LARGESTFREE, ELEMENTID
< 1549, 11, 235753720, 235717496, 1 >
1 row found.

In TimesTen Classic:

  • When you query the GV$BLOCK_INFO view, TimesTen returns the same contents as the V$BLOCK_INFO view. Ignore the elementId column. 

    Command> SELECT * FROM GV$BLOCK_INFO;
 
TOTALBLOCKS, FREEBLOCKS, FREEBYTES, LARGESTFREE, ELEMENTID
< 659, 4, 118359840, 118214208, 1 >
1 row found.

  • When you query the V$BLOCK_INFO view, TimesTen returns data for the database to which your application is connected. Ignore the elementId column. 

    Command> SELECT * FROM V$BLOCK_INFO;
 
TOTALBLOCKS, FREEBLOCKS, FREEBYTES, LARGESTFREE, ELEMENTID
< 659, 4, 118359840, 118214208, 1 >
1 row found.

These views are categorized as follows: