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) But that bitmap index was the cause of all of their problems In a bitmap index, a single key entry points to many rows, hundreds or more of them If you update a bitmap index key, the hundreds of records that key points to are locked as well So, someone inserting the new record with N would lock the N record in the bitmap index, effectively locking hundreds of other N records as well Meanwhile, the process trying to read this table and process the records would be prevented from modifying some N record to be a Y (processed) record, because in order for it to update this column from N to Y, it would need to lock that same bitmap index key.

The UPDATE statement changes the value (or values) of one or more columns of a row (or rows) in a table. The expression to which a column is being set or modified can be a constant, arithmetic, or string operation, or the product of a SELECT statement. The general structure of the UPDATE statement is as follows (note that the elements in square brackets are optional): UPDATE <table> SET <column i> = <expression i>, . . . , <column j> = <expression j> [WHERE <condition> ]; If you want to change or modify a column s values for all the rows in the table, you use an UPDATE statement without a WHERE condition: SQL> UPDATE persons SET salary=salary*0.10; If you want to modify only some rows, you need to use the WHERE clause in your UPDATE statement: SQL> UPDATE persons SET salary = salary * 0.10 WHERE review_grade > 5;

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The WHERE clause in a SELECT, INSERT, DELETE, or UPDATE statement lets you filter data. That is, you can restrict the number of rows on which you want to perform a SQL operation. Here s a simple example: SQL> INSERT INTO a SELECT * FROM b WHERE city='DALLAS';

When you do an update, you ll be modifying index blocks that are stored here and there, and data blocks that are also randomly distributed on disk LGWR, on the other hand, does lots of sequential writes to the redo log This is an important distinction and one of the reasons that Oracle has a redo log and the LGWR process as well as the DBWn process Scattered writes are significantly slower than sequential writes By having the SGA buffer dirty blocks and the LGWR process do large sequential writes that can re-create these dirty buffers, we achieve an increase in performance The fact that DBWn does its slow job in the background while LGWR does its faster job while the user waits gives us better overall performance.

In fact, other sessions just trying to insert a new record into this table would be blocked as well, as they would be attempting to lock the same bitmap key entry In short, the developers had created a table that at most one person would be able to insert or update against at a time! We can see this easily using a simple scenario..

Frequently, you ll have to sort the results of a query in some order. The ORDER BY clause enables you to sort the data based on the value of one or more columns. You can choose the sorting order (ascending or descending) and you can choose to sort by column aliases. You can also sort by multiple columns. Here s an example: SQL> SELECT employee_id, salary FROM employees ORDER BY salary;

The ANSI/ISO SQL standard defines four levels of transaction isolation, with different possible outcomes for the same transaction scenario. That is, the same work performed in the same fashion with the same inputs may result in different answers, depending on your isolation level. These isolation levels are defined in terms of three phenomena that are either permitted or not at a given isolation level:

This is true even though Oracle may technically be doing more I/O than it needs to (writes to the log and to the data file) the writes to the online redo log could in theory be skipped if, during a commit, Oracle physically wrote the modified blocks out to disk instead In practice, it does not happen this way: LGWR writes the redo information to the online redo logs for every transaction, and DBWn flushes the database blocks to disk in the background..

Be default, an ORDER BY clause sorts in ascending order. If you want to sort in descending order, you need to specify the DESC keyword: SQL> SELECT employee_id, salary FROM employees ORDER BY salary desc;

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