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If at 9:00 am when we did the initial pull of data we hit that row and it was locked, we would have blocked and waited for it, and read the committed version If it were not locked, we would just read whatever was there, committed So, does this mean the preceding logic just cannot be used No, it means that we need to get the right now time a little differently We need to query V$TRANSACTION and find out which is the earliest of the current time and the time recorded in the START_TIME column of this view We will need to pull all records changed since the start time of the oldest transaction (or the current SYSDATE value if there are no active transactions): select nvl( min(to_date(start_time,'mm/dd/rr hh24:mi:ss')),sysdate) from v$transaction; In this example, that would be 8:59:30 am when the transaction that modified the row started.

Contrary to what its name suggests, this package won t help you administer space within the Oracle database. You use the DBMS_SPACE_ADMIN package mostly to manage the locally managed tablespaces. The package has several procedures, as shown in Listing 24-15.

Listing 24-15. Describing the DBMS_SPACE_ADMIN Package SQL> DESC DBMS_SPACE_ADMIN Argument Name Type ------------------------------ -------------PROCEDURE SEGMENT_CORRUPT TABLESPACE_NAME VARCHAR2 HEADER_RELATIVE_FILE BINARY_INTEGER HEADER_BLOCK BINARY_INTEGER CORRUPT_OPTION BINARY_INTEGER PROCEDURE SEGMENT_DROP_CORRUPT TABLESPACE_NAME VARCHAR2 HEADER_RELATIVE_FILE BINARY_INTEGER HEADER_BLOCK BINARY_INTEGER PROCEDURE TABLESPACE_MIGRATE_FROM_LOCAL TABLESPACE_NAME VARCHAR2 PROCEDURE TABLESPACE_MIGRATE_TO_LOCAL TABLESPACE_NAME VARCHAR2 UNIT_SIZE BINARY_INTEGER RFNO BINARY_INTEGER PROCEDURE TABLESPACE_RELOCATE_BITMAPS TABLESPACE_NAME VARCHAR2 FILNO BINARY_INTEGER BLKNO BINARY_INTEGER PROCEDURE TABLESPACE_VERIFY TABLESPACE_NAME VARCHAR2 VERIFY_OPTION BINARY_INTEGER SQL> In/Out Default -------- -------IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN DEFAULT DEFAULT DEFAULT

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When we go to refresh the data at 10:00 am, we pull all of the changes that had occurred since that time, and when we merge these into the data warehouse, we ll have.

Another worker might expose 50 methods, but have only one class with a total of 50 lines of code This part would be internally simple but externally complex The internal complexity affects the level of difficulty to design, implement, and maintain a part The external complexity affects the level of difficulty to test and integrate a component How externally complex should a component be The simpler, the better In the absence of a perfect answer, heuristics are useful A reasonable one might be what I call the 10-10-10 guideline:4 A worker should not expose more than 10 properties, 10 methods, and 10 events Most workers don t expose the same number of properties, methods, and events, but the interface footprint should contain 30 items or less If a worker exposed only methods, it should expose no more than 30.

You can use the DBMS_SPACE_ADMIN package to migrate dictionary-managed tablespaces to locally managed tablespaces. Make sure you first follow all the requirements before you perform the actual migration of the tablespaces. The following example shows how to use the TABLESPACE_MIGRATE_TO_LOCAL procedure to perform the tablespace migration. There s also a TABLESPACE_MIGRATE_FROM_LOCAL procedure that converts a locally managed tablespace into a dictionary-managed tablespace. SQL> EXECUTE DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL('TEST1'); PL/SQL procedure successfully completed. SQL>

Another situation where it is vital that you understand read consistency and multi-versioning is when you are faced with a query that in production, under a heavy load, uses many more I/Os than you observe in your test or development systems, and you have no way to account for it You review the I/O performed by the query and note that it is much higher than you have ever seen much higher than seems possible You restore the production instance on test and discover that the I/O is way down But in production it is still very high (but seems to vary: sometimes it is high, sometimes it is low, and sometimes it is in the middle) The reason, as we ll see, is that in your test system, in isolation, you do not have to undo other transactions changes.

The DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL procedure has three parameters, but you can leave out the UNIT_SIZE and the REFNO (relative file number) parameters in most cases.

There is nothing magical about the number 30, but workers exposing more than 30 interface items are probably trying to do too much and will be difficult to test and maintain..

The DBMS_PROFILER package lets you gather performance data on your applications. Each time your PL/SQL code executes in the database, performance data is stored in database tables. You start the profiler, run your PL/SQL code, and stop the profiler. Repeated executions of several variations of the code will give you a good idea about where your performance problems lie.

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