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Oracle® Database Reference
12c Release 1 (12.1)

E17615-24
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V$SQL_SHARED_MEMORY

V$SQL_SHARED_MEMORY displays information about the cursor shared memory snapshot. Each SQL statement stored in the shared pool has one or more child objects associated with it. Each child object has several parts, one of which is the context heap, which holds, among other things, the query plan.

Column Datatype Description
SQL_TEXT VARCHAR2(1000) SQL text of the shared cursor child object for which this row is displaying information
SQL_FULLTEXT CLOB Full text for the SQL statement exposed as a CLOB column. The full text of a SQL statement can be retrieved using this column instead of joining with the V$SQLTEXT dynamic performance view.
HASH_VALUE NUMBER Hash value of the above SQL text in the shared pool
SQL_ID VARCHAR2(13) SQL identifier of the above SQL text in the shared pool
HEAP_DESC RAW(4 | 8) Address of the descriptor for the context heap of the child cursor described in this row
STRUCTURE VARCHAR2(16) If the memory chunk described in this row was allocated using a comment of the form "X : Y", then this is the "X" part of the comment
FUNCTION VARCHAR2(16) Similar to the STRUCTURE column, this is the "Y" field of the comment
CHUNK_COM VARCHAR2(16) Whole comment field that was supplied when this memory chunk was allocated
CHUNK_PTR RAW(4 | 8) Starting address of the allocated memory chunk
CHUNK_SIZE NUMBER Amount of memory allocated for this chunk
ALLOC_CLASS VARCHAR2(8) Class of memory that this chunk of memory belongs to. It will usually be either FREEABLE or PERMANENT.
CHUNK_TYPE NUMBER An index into a table of callback functions that tell the server how to re-create this chunk of memory should it need to be removed from the shared pool based on an LRU algorithm
SUBHEAP_DESC RAW(4 | 8) If the parent heap of this context heap is itself a subheap, then this is the address of the descriptor of the parent heap
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