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You, as the DBA, have to decide how big your Oracle blocks should be and set the DB_BLOCK_SIZE parameter in your Oracle initialization file (the init.ora file). Think of the block size as the minimum unit for conducting Oracle s business of updating, selecting, or inserting data. When a user selects data from a table, the select operation will read, or fetch, data from the database files in units of Oracle blocks. If you choose the common Oracle block size of 8KB, your data block will have exactly 8,192 bytes. If you use an Oracle block size of 64KB (65,536 bytes), even if you just want to retrieve a name that s only four characters long, you ll have to read in the entire block of 64KB that happens to contain the four characters you re interested in.

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As you know by now, when you drop a table, Oracle doesn t immediately reclaim the space occupied by the table and its indexes. Instead, Oracle places these objects in the Recycle Bin. Unless there s space pressure or you use the DROP TABLE table_name PURGE command, the table remains in place, although its name is internally changed to a system-generated name. You can use the FLASHBACK TABLE . . . TO BEFORE DROP command to recover all objects from the Recycle Bin. The DBA_RECYCLEBIN view shows all objects dropped by you that the database still retains: SQL> SELECT object_name,original_name,can_undrop,can_purge 2 FROM DBA_RECYCLEBIN; OBJECT_NAME ORIGINAL_NAME CAN_UNDROP CAN_PURGE ------------------------------ -----------------------------------BIN$5CiRvIxdSMngNABgsLLCaA==$0 UTL_RECOMP_ERR YES YES BIN$5CiRvIxaSMngNABgsLLCaA==$0 UTL_RECOMP_IDX1 NO YES SQL>

You can use the SHOW RECYCLEBIN command in SQL*Plus to see the objects that are in the Recycle Bin. However, unlike a query on the DBA_RECYCLEBIN view, this command only shows you objects that you can undrop.

For native objects, destruction and memory deallocation are strictly coupled For example, when an instance on the native heap is deleted, its destructor is called and the heap can use the object s space for other further allocations Therefore, reading fields from the deallocated object will likely read random data Modifying fields from the deallocated object can be even worse, because it can change other objects randomly This typically causes undefined behavior that is often detected millions of processor instructions later These scenarios are often difficult to debug, because the source of the problem (an illegal pointer) and the symptoms (undefined behavior because of inconsistent state) often appear unrelated Accessing managed objects that have been disposed does not cause access to deallocated memory The GC is aware of the tracking handle referring to the disposed object.

The FLASHBACK_TRANSACTION_QUERY view contains information about all flashback transaction queries in the database. This view gives you the necessary SQL statements to undo changes made by a transaction or during a certain time period. Using the Flashback Transaction Query feature, you can generate the SQL statements to undo changes faster than by using LogMiner. 6 shows how to use this feature.

These values are useful to get logging set up and to ensure that the script is working, but normally you ll want to set these to no so that the log file doesn t grow to take over your hard disk.

If you have created any jobs within your database using the DBMS_JOB package ( 24 shows you how to do this), you can query the DBA_JOBS view to monitor the job status. Listing 23-3 shows a typical query against the DBA_JOBS view. Listing 23-3. Querying the DBA_JOBS View SQL> 2 3 4 5 6 /* Job Identifier */ /* last time the job was successfully run */ /* data when the job started executing */ /* next time the job is scheduled to run * /Y=an attempt will not be made to run it. No=attempt will be made*/ 7 interval, /* the next NEXT_DATE */ 8 failures, /* Number of failures since last success */ 9 what /*Text of the PL/SQL code the job will execute*/ 10 FROM DBA_JOBS; SELECT job, last_date, this_date, next_date, broken,