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Deadlocks occur in any RDBMS when two sessions block each other while each waits for a resource that the other session is holding. This is a catch-22 situation, because the stalemate can t be broken by either session unilaterally. In such circumstances, Oracle steps in, kills one of the sessions, and rolls back its transaction. Oracle quickly recognizes that two sessions are deadlocked and terminates the transaction that holds the most recently applied lock. This will release the object locks that the other session is waiting for. You don t really need to do anything when there are deadlocks, although you ll see messages in your dump directory that deadlocks are currently in the database. When Oracle encounters a deadlock between transactions, it records in the trace file (in the directory location specified by the USER_DUMP_DEST initialization parameter) the session IDs involved, the SQL statements issued in the transactions, and the specific object name and the rows on which locks are held in each session involved in the deadlock. Oracle further informs you that the deadlock is not an Oracle error, but is due to errors in application design or is a result of issuing ad hoc SQL. Application designers must write exception handlers in the code to roll back the aborted transaction and restart it. You can avoid deadlocks by paying attention in the design phase and ensuring the proper locking order of the objects. Given that writers block other writers, deadlocks in Oracle are a rare phenomenon.

Consistent gets: This is a read of the buffer cache, to retrieve a block in consistent mode This may include a read of undo segments to maintain the read consistency principle (see 8 for more information about read consistency) If Oracle finds that another session has updated the data in that block since the read began, then it will apply the new information from the undo segments Logical reads: Every time Oracle is able to satisfy a request for data by reading it from the database buffer cache, you get a logical read Thus logical reads include both DB block gets and consistent gets Buffer gets: This term refers to the number of database cache buffers retrieved This value is the same as the logical reads described earlier.

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The V$BUFFER_POOL view shows you multiple buffer pool information. By default there s just one pool, named the default pool, but you can configure other pools, called the recycle and keep buffer pools. The following query uses the V$BUFFER_POOL view:

The following formula gives you the buffer cache hit ratio: 1 - ('physical reads cache') / ('consistent gets from cache' + 'db block gets from cache') You can use the following query to get the current values for all three necessary buffer cache statistics: SQL> SELECT name, value FROM v$sysstat WHERE where name IN ('physical reads cache', 'consistent gets from cache', 'db block gets from cache');.

SQL> 2 3 4 5*

NAME --------------------------db block gets from cache consistent gets from cache physical reads cache 3 rows selected. SQL>

SELECT name, /* name of pool - recycle, keep, or default */ current_size, /* size in megabytes */ buffers /* number of buffers */ FROM V$BUFFER_POOL;

VALUE ----------103264732 5924585423 50572618

NAME CURRENT_SIZE BUFFERS -------------------- ------------ ---------DEFAULT 24 3000 SQL> The V$BUFFER_POOL_STATISTICS view shows details about all the buffer pools in a database instance.

The following calculation, based on the statistics I derived in the preceding code from the V$SYSSTAT view, show that the buffer cache hit ratio for my database is a little over 91 percent: 1 - (505726180)/(103264732 + 5924585494) = 916101734 As you can see from the formula for the buffer cache hit ratio, the lower the ratio of physical reads to the total logical reads, the higher the buffer cache hit ratio You can use the V$BUFFER_POOL_STATISTICS view, which lists all buffer pools for the instance, to derive the hit ratio for the buffer cache: SQL> SELECT NAME, PHYSICAL_READS, DB_BLOCK_GETS, CONSISTENT_GETS, 1 - (PHYSICAL_READS/(DB_BLOCK_GETS + CONSISTENT_GETS)) "HitRatio" FROM V$BUFFER_POOL_STATISTICS; NAME ------DEFAULT SQL> In addition, you can use the Database Control s Memory Advisor to get advice regarding the optimal buffer cache size.

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