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Database SQL Language Reference, 11g Release 2 (11.2)

FLASHBACK TABLE

FLASHBACK TABLEPurpose Use the FLASHBACK TABLE statement to restore an earlier state of a table in the event of … human or application error. The time in the past to which the table can be flashed back is dependent … on the amount of undo data in the system. Also, Oracle Database cannot restore a table to an earlier … state

Database SQL Language Reference, 11g Release 2 (11.2)

DROP TABLE

DROP TABLEPurpose Use the DROP TABLE statement to move a table or object table to the recycle bin or to … remove the table and all its data from the database entirely. Caution: Unless you specify the PURGE … clause, the DROP TABLE statement does not result in space being released back to the tablespace for use

Database SQL Language Reference, 11g Release 2 (11.2)

LOCK TABLE

LOCK TABLEPurpose Use the LOCK TABLE statement to lock one or more tables, table partitions, or table … access to a table or view by other users for the duration of your operation. Some forms of locks can be … placed on the same table at the same time. Other locks allow only one lock for a table.

Database SQL Language Reference, 11g Release 2 (11.2)

CREATE TABLE

CREATE TABLEPurpose Us e the CREATE TABLE statement to create one of the following types of tables: A … relational table, which is the basic structure to hold user data. An object table, which is a table that uses … an object type for a column definition. An object table is explicitly defined to hold object

Database SQL Language Reference, 11g Release 2 (11.2)

ALTER TABLE

ALTER TABLEPurpose Use the ALTER TABLE statement to alter the definition of a nonpartitioned table, a … partitioned table, a table partition, or a table subpartition. For object tables or relational tables with … object columns, use ALTER TABLE to convert the table to the latest

Database SQL Language Reference, 11g Release 2 (11.2)

TRUNCATE TABLE

TRUNCATE TABLEPurpose Caution: You cannot roll back a TRUNCATE TABLE statement, nor can you use a FLASHBACK TABLE … statement to retrieve the contents of a table that has been truncated. Use the TRUNCATE TABLE … statement to remove all rows from a table. By default, Oracle Database also performs the following tasks

Database SQL Language Reference, 11g Release 2 (11.2)

Selecting from the DUAL Table

Selecting from the DUAL TableDUAL is a table automatically created by Oracle Database along with the data dictionary. DUAL is in … , DUMMY, defined to be VARCHAR2(1), and contains one row with a value X. Selecting from the DUAL table is … expression from any table, but the value will be returned as many times as there are rows in the table

Database SQL Language Reference, 11g Release 2 (11.2)

SQL Statements: ALTER TABLE to ALTER TABLESPACE

12 SQL Statements: ALTER TABLE to ALTER TABLESPACEThis chapter contains the following SQL statements: ALTER TABLE ALTER TABLESPACE

Database SQL Language Reference, 11g Release 2 (11.2)

Logical Conditions

Table 7-5 NOT Truth Table-- TRUE FALSE UNKNOWN NOT FALSE TRUE UNKNOWN Table 7-6 shows the results of combining the AND condition to two expressions.

Database SQL Language Reference, 11g Release 2 (11.2)

Logical Conditions

Table 7-6 AND Truth Table: SELECT * FROM employees WHERE hire_date 2500 ORDER BY employee_id; Table 7-7 shows the results of applying OR to two expressions.

Database SQL Language Reference, 11g Release 2 (11.2)

Logical Conditions

Table 7-7 OR Truth TableOR TRUE FALSE UNKNOWN TRUE TRUE TRUE TRUE FALSE TRUE FALSE UNKNOWN UNKNOWN TRUE UNKNOWN UNKNOWN For example, the following query returns employees who have a 40% commission rate or a salary greater than $20,000: SELECT employee_id FROM employees WHERE commission_pct =.4 OR salary > 20000 ORDER BY employee_id;

Database Administrator's Guide, 11g Release 2 (11.2)

Managing Tables

Creating a Temporary Tableoptional itineraries. Each itinerary is represented by a row in a temporary table. The application … wants to use, the application moves the row for that itinerary to a persistent table. During the … . The definition of a temporary table is visible to all sessions, but the data in a temporary table is … visible

Database Administrator's Guide, 11g Release 2 (11.2)

Managing Tables

Example: Creating a TableWhen you issue the following statement, you create a table named admin_emp in the hr schema and … store it in the admin_tbs tablespace: CREATE TABLE hr.admin_emp ( empno NUMBER(5) PRIMARY KEY, ename … hr.departments (department_id)) TABLESPACE admin_tbs STORAGE ( INITIAL 50K); COMMENT ON TABLE hr.admin_emp IS … 'Enhanced employee

Database Administrator's Guide, 11g Release 2 (11.2)

Managing Distributed Transactions

Table 35-1 DBA_2PC_PENDINGColumn Description LOCAL_TRAN_ID Local transaction identifier in the format integer. integer. integer. Note: When the LOCAL_TRAN_ID and the GLOBAL_TRAN_ID for a connection are the same, the node is the global coordinator of the transaction. GLOBAL_TRAN_ID Global database identifier in the format global_db_nam e. db_hex_id. local_tran_id, where db_hex_id is an eight-character hexadecimal value used

Database Administrator's Guide, 11g Release 2 (11.2)

Managing Tables

Consider Using Table CompressionAs your database grows in size, consider using table compression. Compression saves disk space … offset by reduced I/O requirements. Table compression is completely transparent to applications. It is … systems. You can specify compression for a tablespace, a table, or a partition. If specified at the … can occur while data is

Database Administrator's Guide, 11g Release 2 (11.2)

Managing Tables

Adding Table ColumnsTo add a column to an existing table, use the ALTER TABLE...ADD statement. The following statement … alters the hr.admin_emp table to add a new column named bonus: ALTER TABLE hr.admin_emp ADD (bonus … NUMBER (7,2)); If a new column is added to a table, the column is initially NULL unless you specify

Database PL/SQL Language Reference, 11g Release 2 (11.2)

PL/SQL Optimization and Tuning

Chaining Pipelined Table FunctionsTo chain pipelined table functions tf1 and tf2 is to make the output of tf1 the input of tf2. For … example: SELECT * FROM TABLE(tf2(CURSOR(SELECT * FROM TABLE(tf1())))); The rows that tf1 pipes out … table functions are enabled for parallel execution, then each function runs in a different process (or … set of

Database Administrator's Guide, 11g Release 2 (11.2)

Managing Tables

Consider Parallelizing Table CreationTABLE statement. Because multiple processes work together to create the table, performance of the … table creation operation is improved. Parallelizing table creation is discussed in the section \"Parallelizing Table Creation\".

Database Administrator's Guide, 11g Release 2 (11.2)

Managing Tables

Dropping Table ColumnsYou can drop columns that are no longer needed from a table, including an index-organized table … data then re-create indexes and constraints. You cannot drop all columns from a table, nor can you … drop columns from a table owned by SYS. Any attempt to do so results in an error. See Also: Oracle … columns from

Database PL/SQL Language Reference, 11g Release 2 (11.2)

PL/SQL Optimization and Tuning

Overview of Table FunctionsA table function is a user-defined PL/SQL function that returns a collection of rows (a nested … table or varray). You can select from this collection as if it were a database table by invoking the … table function inside the TABLE clause in a SELECT statement. For example: SELECT * FROM TABLE