TASK_NAME

VARCHAR2(128)

Advisor task name in which the SQL plan was generated (see DBA_ADVISOR_TASKS)

TASK_ID

NUMBER(38)

NOT NULL

Advisor task ID in which the SQL plan was generated (see DBA_ADVISOR_TASKS)

EXECUTION_NAME

VARCHAR2(128)

NOT NULL

Advisor task execution in which the SQL plan was generated (see DBA_ADVISOR_EXECUTIONS)

SQL_ID

VARCHAR2(13)

NOT NULL

Identifier for the relevant SQL statement

OBJECT_ID

NUMBER(38)

NOT NULL

Advisor object ID identifying the relevant SQL statement (see DBA_ADVISOR_OBJECTS)

ATTRIBUTE

VARCHAR2(34)

Text string identifying the type of the execution plan. The following values are used by the SQL Tuning Advisor:

• Original - Original plan of the query

• Original with adjusted cost - Same as Original but with adjusted cost

• Using SQL profile - Plan with SQL profile applied

• Using new indices - Plan with indexes applied

STATEMENT_ID

VARCHAR2(30)

Optional statement identifier specified in the EXPLAIN PLAN statement

PLAN_HASH_VALUE

NUMBER

NOT NULL

Numerical representation of the execution plan

PLAN_ID

NUMBER

NOT NULL

Plan identifier

TIMESTAMP

DATE

Date and time when the EXPLAIN PLAN statement was issued

REMARKS

VARCHAR2(4000)

Place for comments that can be added to the steps of the execution plan

OPERATION

VARCHAR2(30)

Name of the operation performed at this step

OPTIONS

VARCHAR2(255)

Options used for the operation performed at this step

OBJECT_NODE

VARCHAR2(128)

Name of the database link used to reference the object

OBJECT_OWNER

VARCHAR2(128)

Owner of the object

OBJECT_NAME

VARCHAR2(128)

Name of the object

OBJECT_ALIAS

VARCHAR2(261)

Object alias

OBJECT_INSTANCE

NUMBER(38)

Numbered position of the object name in the original SQL statement

OBJECT_TYPE

VARCHAR2(30)

Descriptive modifier that further describes the type of object

OPTIMIZER

VARCHAR2(255)

Current mode of the optimizer

SEARCH_COLUMNS

NUMBER

Number of index columns with start and stop keys (that is, the number of columns with matching predicates)

ID

NUMBER(38)

NOT NULL

Identification number for this step in the execution plan

PARENT_ID

NUMBER(38)

ID of the next step that operates on the results of this step

DEPTH

NUMBER(38)

Depth

POSITION

NUMBER(38)

Order of processing for steps with the same parent ID

COST

NUMBER(38)

Cost of the current operation estimated by the cost-based optimizer (CBO)

CARDINALITY

NUMBER(38)

Number of rows returned by the current operation (estimated by the CBO)

BYTES

NUMBER(38)

Number of bytes returned by the current operation

OTHER_TAG

VARCHAR2(255)

Describes the function of the SQL text in the OTHER column. Values for OTHER_TAG are:

• SERIAL - SQL is the text of a locally-executed, serial query plan. Currently, SQL is not loaded in OTHER for this case.

• SERIAL_FROM_REMOTE - SQL text shown in the OTHER column will be executed at a remote site

• PARALLEL_COMBINED_WITH_PARENT - Parent of this operation is a DFO that performs both operations in the parallel execution plan

• PARALLEL_COMBINED_WITH_CHILD - Child of this operation is a DFO that performs both operations in the parallel execution plan.

• PARALLEL_TO_SERIAL - SQL text shown in the OTHER column is the top-level of the parallel plan.

• PARALLEL_TO_PARALLEL - SQL text shown in the OTHER column is executed and output in parallel

• PARALLEL_FROM_SERIAL - Operation consumes data from a serial operation and outputs it in parallel

PARTITION_START

VARCHAR2(255)

Start partition of a range of accessed partitions

PARTITION_STOP

VARCHAR2(255)

Stop partition of a range of accessed partitions

PARTITION_ID

NUMBER(38)

Step that has computed the pair of values of the PARTITION_START and PARTITION_STOP columns

OTHER

LONG

Information about parallel execution servers and parallel queries

DISTRIBUTION

VARCHAR2(30)

Distribution method

CPU_COST

NUMBER(38)

User-defined CPU cost

IO_COST

NUMBER(38)

User-defined I/O cost

TEMP_SPACE

NUMBER(38)

Temporary space usage of the operation (sort or hash-join) as estimated by the CBO

ACCESS_PREDICATES

VARCHAR2(4000)

Predicates used to locate rows in an access structure. For example, start or stop predicates for an index range scan.

FILTER_PREDICATES

VARCHAR2(4000)

Predicates used to filter rows before producing them

PROJECTION

VARCHAR2(4000)

Expressions produced by the operation

TIME

NUMBER(38)

Elapsed time (in seconds) of the operation as estimated by the CBO

QBLOCK_NAME

VARCHAR2(128)

Name of the query block

OTHER_XML

CLOB

Provides extra information specific to an execution step of the execution plan. The content of this column is structured using XML because it allows multiple pieces of information to be stored, including the following:

• Name of the schema against which the query was parsed

• Release number of the Oracle Database that produced the explain plan

• Hash value associated with the execution plan

• Name (if any) of the outline or the SQL profile used to build the execution plan

• Indication of whether or not dynamic statistics were used to produce the plan

• The outline data, a set of optimizer hints that can be used to regenerate the same plan