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Figure 12-3. Table to LOBINDEX to LOBSEGMENT The LOB in the table really just points to the LOBINDEX; the LOBINDEX, in turn, points to all of the pieces of the LOB itself. To get bytes N through M of the LOB, you would dereference the pointer in the table (the LOB locator), walk the LOBINDEX structure to find the needed chunks, and then access them in order. This makes random access to any piece of the LOB equally fast you can get the front, the middle, or the end of a LOB equally fast, as you don t always just start at the beginning and walk the LOB. Now that you understand conceptually how a LOB is stored, I d like to walk through each of the optional settings listed previously and explain what they are used for and what exactly they imply.

we ll see, upon working with the LOB locator and opened cursor, that the data is presented as of the point in time we retrieved or opened them :

You can specify the REUSE_DUMPFILE parameter to overwrite an export dump file. By default, the database doesn t overwrite dump files. You can specify the value Y to overwrite a dump file and the value N for the default behavior, which is not to use older dump files. Here s an example showing how to specify this parameter during an export job: $ expdp hr DIRECTORY=dpump_dir1 DUMPFILE=hr.dmp TABLES=employees REUSE_DUMPFILES=y Of course, you must make sure that you don t need the contents of the preexisting dump file, hr.dmp.

The CREATE TABLE statement returned from DBMS_METADATA included the following: LOB ("TXT") STORE AS BASICFILE ( TABLESPACE "USERS"

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The COMPRESSION parameter enables the user to specify which data to compress before writing the export data to a dump file. By default, all metadata is compressed before it s written out to an export dump file. You can disable compression by specifying a value of NONE for the COMPRESSION parameter, as shown here: $ expdp hr/hr DIRECTORY=dpump_dir1 DUMPFILE=hr_comp.dmp COMPRESSION=NONE The COMPRESSION parameter can take any of the following four values: ALL: Enables compression for the entire operation. DATA_ONLY: Specifies that all data should be written to the dump file in a compressed format. METADATA_ONLY: Specifies all metadata be written to the dump file in a compressed format. This is the default value. NONE: Disables compression of all types.

dbms_output.put_line( dbms_lob.substr( l_clob, 100, 1 ) ); fetch c into l_id; dbms_output.put_line( 'id = ' || l_id ); close c;

The export mode-related parameters are FULL, SCHEMAS, TABLES, TABLESPACES, TRANSPORT_TABLESPACES, and TRANSPORT_FULL_CHECK. You ve already seen all these parameters except the last one, TRANSPORT_ FULL_CHECK, in the Data Pump Export Modes section earlier in this chapter. The TRANSPORT_FULL_CHECK parameter checks to make sure that the tablespaces you are trying to transport meet all the conditions to qualify for the transportable tablespaces job. Using this parameter, you can specify whether to check for dependencies between objects inside the transportable set and the other objects in the database. For example, an index is entirely dependent on the table, since it doesn t have any meaning without the table. However, a table isn t dependent on an index, since the table can exist without an index. You can set the TRANSPORT_FULL_CHECK parameter to a value of Y or N. If you set TRANSPORT_ FULL_CHECK=Y, the Data Pump Export job will check for two-way dependencies. If you have a table in the transportable tablespace but not its indexes, or your tablespace contains indexes without their tables, the export job will fail. If you set TRANSPORT_FULL_CHECK=N, the Data Pump Export job will check for one-way dependencies. If your transportable tablespace set contains tables without their indexes, the export will succeed. However, if the set contains indexes without their tables, the export job will fail.

The TABLESPACE specified here is the tablespace where the LOBSEGMENT and LOBINDEX will be stored, and this may be different from the tablespace where the table itself resides. That is, the tablespace that holds the LOB data may be separate and distinct from the tablespace that holds the actual table data. The main reasons you might consider using a different tablespace for the LOB data versus the table data are mostly administrative and performance related. From the administrative angle, a LOB datatype represents a sizable amount of information. If the table had millions of rows, and each row has a sizeable LOB associated with it, the LOB data would be huge. It would make sense to segregate the table from the LOB data just to facilitate backup and recovery and space management. You may well want a different uniform extent size for your LOB data than you have for your regular table data, for example. The other reason could be for I/O performance. By default, LOBs are not cached in the buffer cache (more on that later). Therefore, by default every LOB access, be it read or write, is a physical I/O a direct read from disk or a direct write to disk.

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