V$BUFFER_POOL

V$BUFFER_POOL displays information about all buffer pools available for the instance.

Column	Datatype	Description
`ID`	`NUMBER`	Buffer pool identifier number
`NAME`	`VARCHAR2(20)`	Name of the buffer pool: `DEFAULT` `KEEP` `RECYCLE` Note: Currently, `KEEP` and `RECYCLE` pools only exist for the standard block size. All nonstandard block size pools are `DEFAULT`.
`BLOCK_SIZE`	`NUMBER`	Block size (in bytes) for buffers in this pool. Possible values: the standard block size, the power of 2 nonstandard block sizes, `2048`, `4096`, `8192`, `16384`, `32768`.
`RESIZE_STATE`	`VARCHAR2(10)`	Current state of the resize operation: `STATIC` - Not being resized `ALLOCATING` - Memory is being allocated (can be canceled by the user) `ACTIVATING` - New buffers are being created (user cannot cancel) `SHRINKING` - Buffers are being deleted (can be canceled by the user)
`CURRENT_SIZE`	`NUMBER`	Present size of the sub-cache (in megabytes)
`BUFFERS`	`NUMBER`	Current instantaneous number of buffers
`TARGET_SIZE`	`NUMBER`	If a resize is in progress (state is not `STATIC`), records new target size (in megabytes). If the pool is `STATIC`, the value in this column is the same as the current size of the pool.
`TARGET_BUFFERS`	`NUMBER`	If a resize is in progress, records new target size in terms of buffers. Otherwise, the value in this column is the same as the current number of buffers.
`PREV_SIZE`	`NUMBER`	Previous buffer pool size. If the buffer pool has never been resized, the previous size is zero.
`PREV_BUFFERS`	`NUMBER`	Previous number of buffers in the buffer pool. Value is zero if the buffer pool has never been resized.
`LO_BNUM`	`NUMBER`	Obsolete column
`HI_BNUM`	`NUMBER`	Obsolete column
`LO_SETID`	`NUMBER`	Obsolete column
`HI_SETID`	`NUMBER`	Obsolete column
`SET_COUNT`	`NUMBER`	Obsolete column
`CON_ID`	`NUMBER`	The ID of the container to which the data pertains. Possible values include: `0`: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. `1`: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data