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SQL> CONNECT system/system_passwd@remote_db Connected. SQL> CREATE OR REPLACE DIRECTORY source_dir as '/u01/app/oracle/source'; SQL> connect system/system_passwd@local_db Connected. SQL> CREATE OR REPLACE DIRECTORY dest_dir as /'u01/app/oracle/dest'; You can now use the PUT_FILE procedure to put a local file on the remote server, as shown here: SQL> BEGIN DBMS_FILE_TRANSFER.PUT_FILE( source_directory_object source_file_name destination_directory_object destination_file_name destination_database END; / SQL>

that they wanted to index that column They had read somewhere that bitmap indexes are for low-cardinality columns (columns that have only a few distinct values) so it seemed a natural fit Nevertheless, that bitmap index was the cause of all of their problems In a bitmap index, a single key entry points to many rows hundreds or more of them If you update a bitmap index key, the hundreds of records to which that key points are effectively locked as well as the single row you are actually updating So, someone inserting a new N record would lock an N key in the bitmap index, effectively locking hundreds of other N records as well.

'SOURCE_DIR', 'test01.dbf', 'DEST_DIR', 'test01.dbf', 'remote_db');

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The most important and complex parts of an EBS are the coordinators and workers Because they are complex, relative to other types of parts, workers and coordinators should be as decoupled as possible from the rest of the system to make them easier to build, test, and deploy While office workers and managers in an office can talk to each other easily, decoupled parts have no built-in connections to other parts, so they can t communicate with others until a communication path is established In an EBS, the dominant form of communication between the salient parts is through event notifications, so you must establish notification paths at run time in a process called binding or wiring The wires of an EBS act in much the same way as the old pneumatic tube message-delivery systems used in the 1800s in large businesses.

The DBMS_MONITOR package helps you trace and gather statistics about client sessions. This package is at the heart of the new end-to-end tracing feature of Oracle Database 10g. The package has routines for enabling and disabling statistics aggregation and for tracing by session ID, or a combination of service name, module name, and action name. 23 contains a detailed discussion of this package. Here are the important procedures of the package: CLIENT_ID_STAT_ENABLE enables statistics accumulation for a client identifier. CLIENT_ID_STAT_DISABLE disables statistics accumulation for a client identifier. SERV_MOD_ACT_STAT_ENABLE enables the aggregation of statistics for a hierarchy of service name, module name, and action name. SERV_MOD_ACT_STAT_DISABLE disables the aggregation of statistics for a hierarchy of service name, module name, and action name.

Meanwhile, the process trying to read this table and process the records would be prevented from modifying some N record to be a Y (processed) record, because in order for it to update this column from N to Y, it would need to lock that same bitmap index key In fact, other sessions just trying to insert a new record into this table would be blocked as well, as they would be attempting to lock this same bitmap key entry In short, the developers had implemented a set of structures that at most one person would be able to insert or update against at a time! I can demonstrate this scenario easily with a simple example Here, I use two sessions to demonstrate the blocking that can easily happen: ops$tkyte@ORA10G> create table t ( processed_flag varchar2(1) ); Table created ops$tkyte@ORA10G> create bitmap index t_idx on t(processed_flag); Index created.

The UTL_COMPRESS package lets you compress and decompress binary data (RAW, BLOB, and BFILE). It provides the same functionality as the gzip utility. Here s a simple example: SQL> SET SERVEROUTPUT ON SQL> DECLARE l_original_blob BLOB; l_compressed_blob BLOB; l_uncompressed_blob BLOB; BEGIN l_original_blob := TO_BLOB(UTL_RAW.CAST_TO_RAW('1234567890123456789012 345678901234567890')); l_compressed_blob := TO_BLOB('1');

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