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The table lock prevents any updates from taking place against the entire table for the duration of your query (for a table of four rows, this would only be a very short period, but for tables with hundreds of thousands of rows, it could be several minutes) The.

If you re the only Oracle DBA in your organization, you must have all the system privileges to manage the database. However, if you have a group of Oracle DBAs managing a large number of databases, it s smart not to give everyone the same type of privileges (such as SYSDBA) and the same type of roles (such as DBA). You should create your own specialized roles, with each role containing a specific set of privileges for performing certain database tasks. Thus, a DBA in charge of helping the developers create new objects won t be able to perform certain recovery-related tasks, and vice versa. You can then assign these roles to the DBAs, ensuring that there is a clear demarcation of job duties.

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lock as you go method prevents updates on data you have read and already processed and could actually cause deadlocks between your query and other updates Now, I said earlier that you wouldn t be able to take full advantage of Oracle if you didn t understand the concept of multi-versioning Here is one reason why that is true Oracle uses multiversioning to get the answer, as it existed at the point in time the query began, and the query will take place without locking a single thing (while our account transfer transaction updates rows 1 and 4, these rows will be locked to other writers, but not locked to other readers, such as our SELECT SUM..query) In fact, Oracle doesn t have a shared read lock (a type of lock common in other databases) it doesn t need it.

The theoretical advantage of the first approach is that to move from database to database you need not change anything. I call it a theoretical advantage because the downside of this implementation is so huge that it makes this solution totally infeasible. What you would have to do to develop a totally database-independent process is to create a table such as ops$tkyte@ORA10G> create table id_table 2 ( id_name varchar2(30) primary key, 3 id_value number ); Table created. ops$tkyte@ORA10G> insert into id_table values ( 'MY_KEY', 0 ); 1 row created. ops$tkyte@ORA10G> commit; Commit complete. Then, in order to get a new key, you would have to execute the following code: ops$tkyte@ORA10G> update id_table 2 set id_value = id_value+1 3 where id_name = 'MY_KEY'; 1 row updated. ops$tkyte@ORA10G> select id_value 2 from id_table 3 where id_name = 'MY_KEY'; ID_VALUE ---------1 Looks simple enough, but the outcomes (notice plural) are as follows: Only one user at a time may process a transaction row. You need to update that row to increment a counter, and this will cause your program to serialize on that operation. At best, one person at a time will generate a new value for this key. In Oracle (and the behavior might be different in other databases), all but the first user to attempt to concurrently perform this operation would receive the error ORA-08177: can t serialize access for this transaction in the SERIALIZABLE isolation level. For example, using a serializable transaction (which is more common in the J2EE environment, where many tools automatically use this as the default mode of isolation, often unbeknownst to the developers), you would observe the following behavior. Notice that the SQL prompt (using the SET SQLPROMPT SQL*Plus command) contains information about which session is active in this example:

Users that are granted the ANY system privilege can drop data dictionary tables. To protect your data dictionary, you must set the 07_DICTIONARY_ACCESSIBILITY configuration parameter to FALSE in your parameter file. This will limit the ANY privilege to only those users who log in with the SYSDBA privilege.

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