The DBMS_IOT package creates a table into which references to the chained rows for an index-organized table can be placed using the ANALYZE command. DBMS_IOT can also create an exception table into which references to the rows of an index-organized table that violate a constraint can be placed during the enable_constraint operation.
DBMS_IOT is not loaded during database installation. To install DBMS_IOT, run dbmsiotc.sql, available in the ADMIN directory.
This chapter contains the following topics:
Summary of DBMS_IOT Subprograms
Note:
With the introduction of logical-rowids for IOTs with Oracle Database Release 8.1, you no longer need to use the procedures contained in this package which is retained for backward compatibility only. It is however required for servers running with Oracle Database Release 8.0.Table 76-1 DBMS_IOT Package Subprograms
| Subprogram | Description |
|---|---|
|
Creates a table into which references to the chained rows for an index-organized table can be placed using the |
|
|
Creates an exception table into which rows of an index-organized table that violate a constraint can be placed |
This procedure creates a table into which references to the chained rows for an index-organized table can be placed using the ANALYZE command.
DBMS_IOT.BUILD_CHAIN_ROWS_TABLE ( owner IN VARCHAR2, iot_name IN VARCHAR2, chainrow_table_name IN VARCHAR2 default 'IOT_CHAINED_ROWS');
You should create a separate chained-rows table for each index-organized table to accommodate its primary key.
CREATE TABLE l(a char(16),b char(16), c char(16), d char(240),
PRIMARY KEY(a,b,c)) ORGANIZATION INDEX pctthreshold 10 overflow;
EXECUTE DBMS_IOT.BUILD_CHAIN_ROWS_TABLE('SYS','L','LC');
A chained-row table is created with the following columns:
Column Name Null? Type ------------------------------ -------- ---- OWNER_NAME VARCHAR2(30) TABLE_NAME VARCHAR2(30) CLUSTER_NAME VARCHAR2(30) PARTITION_NAME VARCHAR2(30) SUBPARTITION_NAME VARCHAR2(30) HEAD_ROWID ROWID TIMESTAMP DATE A CHAR(16) B CHAR(16) C CHAR(16)
This procedure creates an exception table into which rows of an index-organized table that violate a constraint can be placed during the execution of the following SQL statements:
ALTER TABLE ... ENABLE CONSTRAINT ... EXCEPTIONS INTO
ALTER TABLE ... ADD CONSTRAINT ... EXCEPTIONS INTO
DBMS_IOT.BUILD_EXCEPTIONS_TABLE ( owner IN VARCHAR2, iot_name IN VARCHAR2, exceptions_table_name IN VARCHAR2 default 'IOT_EXCEPTIONS');
You should create a separate exception table for each index-organized table to accommodate its primary key.
EXECUTE DBMS_IOT.BUILD_EXCEPTIONS_TABLE('SYS','L','LE');
An exception table for the preceding index-organized table with the following columns:
Column Name Null? Type ------------------------------ -------- ---- ROW_ID VARCHAR2(30) OWNER VARCHAR2(30) TABLE_NAME VARCHAR2(30) CONSTRAINT VARCHAR2(30) A CHAR(16) B CHAR(16) C CHAR(16)