1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$SCHEDULER_RUNNING_JOBS to V$ZONEMAP_USAGE_STATS
  4. V$SQL_OPTIMIZER_ENV

9.57 V$SQL_OPTIMIZER_ENV

V$SQL_OPTIMIZER_ENV displays the contents of the optimizer environment used to build the execution plan of a SQL cursor. This view can be joined with V$SQLAREA on (HASH_VALUE, ADDRESS) and with V$SQL on (HASH_VALUE, CHILD_ADDRESS).
Column Datatype Description

ADDRESS

RAW(4 | 8)

Address of the parent cursor

HASH_VALUE

NUMBER

Hash value of the parent cursor in the library cache. The hash value is the fixed index for the view and should be used when querying V$SQL_OPTIMIZER_ENV to avoid scanning the entire library cache.

SQL_ID

VARCHAR2(13)

SQL identifier

CHILD_ADDRESS

RAW(4 | 8)

Address of the child cursor

CHILD_NUMBER

NUMBER

Child cursor number

ID

NUMBER

Unique identifier of the parameter in the optimizer environment

NAME

VARCHAR2(40)

Name of the parameter

ISDEFAULT

VARCHAR2(3)

Indicates whether the parameter is set to the default value (YES) or not (NO)

VALUE

VARCHAR2(25)

Value of the parameter

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