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3. The user executes a statement to insert a new row into a table. 4. Oracle checks the user s privileges to make sure the user has the necessary rights to perform the insertion. If the user s privilege information isn t already in the library cache, it will have to be read from disk into that cache. 5. If the user has the requisite privileges, Oracle checks whether a previously executed SQL statement that s similar to the one the user just issued is already in the shared pool. If there is, Oracle executes this version of the SQL; otherwise Oracle parses and executes the user s SQL statement. Oracle then creates a private SQL area in the user session s PGA. 6. Oracle first checks whether the necessary data is already in the data buffer cache. If not, the server process reads the necessary table data from the datafiles on disk. 7. Oracle immediately applies row-level locks, where needed, to prevent other processes from trying to change the same data simultaneously. 8. The server writes the change vectors to the redo log buffer. 9. The server modifies the table data (inserts the new row) in the data buffer cache. 10. The user commits the transaction, making the insertion permanent. Oracle releases the row locks after the commit is issued. 11. The log writer process immediately writes out the changed data in the redo log buffers to the online redo log file. 12. The server process sends a message to the client process to indicate the successful completion of the INSERT operation. The message would be COMMIT COMPLETE in this case. (If it couldn t complete the request successfully, it sends a message indicating the failure of the operation.) 13. Changes made to the table by the insertion may not be written to disk right away. The database writer process writes the changes in batches, so it may be some time before the inserted information is actually written permanently to the database files on disk.
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Note In the previous example, since a new row is being inserted, there s no undo information to record in the undo tablespace. (The ROWID of the new row goes to the undo segment, so you can use a DELETE...WHERE ROWID=... statement to roll back the insert if necessary. If the user had updated a row instead, Oracle would have had to record the before-update row in the undo records. Until the original transaction commits the update, all other users will see the original data values of the row.
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You must be clear about two fundamental transaction-related terms: committing and rolling back transactions. I briefly explain these terms here. 8 contains additional discussion of these two key concepts.
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When you commit a transaction, say by issuing the COMMIT statement, Oracle makes all the changes performed by all the SQL statements in that transaction a permanent part of the database. Before Oracle commits the results of a transaction, it does the following:
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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
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It generates undo information that essentially consists of the before-change values of the data that are going to be modified. The undo data is stored in the undo segments, which are located in the undo tablespace. It also generates redo log data containing changes to the data blocks and to the rollback blocks, in the redo log buffer. The database may write the redo log buffer contents to disk before it commits the transaction. It makes changes to the database buffers in the SGA. The database may write the modified buffers to disk before it commits the transaction. The database may write the transaction changes that are made first in the database buffers in the SGA to the datafiles immediately or sometime after the transaction commits or even before the transaction commits. Once the database commits a transaction, it does the following things: The database assigns and records an SCN for the committed transaction. The log writer writes the redo log entries to the redo log on disk, from the redo log buffer in the SGA; the log writer also records the transaction SCN in the redo log file, marking the official committing of the transaction. The database releases all table and row locks. The database marks the transaction as being completed.
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