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frmt: 0x02 chkval: 0x882e type: 0x23=PAGETABLE SEGMENT HEADER Extent Control Header ----------------------------------------------------------------Extent Header:: spare1: 0 spare2: 0 #extents: 59 #blocks: 483328 last map 0x00000000 #maps: 0 offset: 2720 Highwater:: 0x63826009 ext#: 58 blk#: 8192 ext size: 8192 #blocks in seg. hdr's freelists: 0 #blocks below: 479093 mapblk 0x00000000 offset: 58 Unlocked -------------------------------------------------------Low HighWater Mark : Highwater:: 0x6381ef7e ext#: 4 blk#: 3957 ext size: 8192 #blocks in seg. hdr's freelists: 0 #blocks below: 36725 mapblk 0x00000000 offset: 4 Level 1 BMB for High HWM block: 0x63824028 Level 1 BMB for Low HWM block: 0x6381e018 -------------------------------------------------------Segment Type: 1 nl2: 0 blksz: 8192 fbsz: 0 L2 Array start offset: 0x00001438 First Level 3 BMB: 0x6340802a L2 Hint for inserts: 0x63408029 Last Level 1 BMB: 0x63824028 Last Level II BMB: 0x63412029 Last Level III BMB: 0x6341202a Map Header:: next 0x00000000 #extents:59 obj#:4916681 flag: 0x10000000 . . . End dump data blocks tsn: 110 file#: 397 minblk 32811 maxblk 32811 It is possible to interpret and read dump data to find details about the information in a table or index. Let s look at a simple example that shows how you can get the table name from the preceding block dump information. Take the obj# shown in second-to-last line, and run the following query: SQL> SELECT name 2 FROM sys.obj$ 3* WHERE obj#='4916681'; NAME --------------PERSONS SQL> The previous example is trivial, but it demonstrates how you can derive information straight from a database block dump. Of course, if you need more significant data from the dumps, you d have to employ more rigorous techniques.

When several contiguous data blocks are combined, they are called an extent. When you create a database object like a table or index, you allocate it an initial amount of space, called the initial extent, and you also specify the size of the next and subsequent extents and the maximum number of extents for that object. Once allocated to a table or index, the extents remain allocated to that particular object, unless you drop the object from the database, in which case the space will revert to the pool of allocatable free space in the database.

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Phantom read: This means that if you execute a query at time T1 and re-execute it at time T2, additional rows may have been added to the database, which will affect your results. This differs from the nonrepeatable read in that with a phantom read, data you already read has not been changed, but rather that more data satisfies your query criteria than before.

has higher priority than the original message. Using a separate abort message also makes it clear who has the power to interrupt the interaction.

A set of extents forms the next higher unit of data storage, the segment. Oracle calls all the space allocated to any particular database object a segment. So if you have a table called Customer, you simply refer to the space allocated to it as the Customer segment. When you create an index, it will have its own segment named after the index name. Data and index segments are the most common type of Oracle segments. There are also temporary segments and rollback segments.

Oracle databases are logically divided into one or more tablespaces An Oracle tablespace is a logical entity that contains the physical data files Tablespaces store all the usable data of the database, and the data in the tablespaces is physically stored in one or more data files Data files are Oracleformatted operating system files The tablespace is a purely logical construct and is the primary logical storage structure of an Oracle database You usually should keep related tables together in the same tablespace, since the tablespace also acts as the logical container for logical segments such as tables How big you make your tablespaces depends on the size of your tables and indexes and the total amount of data in the database there are no rules about the minimum or maximum size of tablespaces (the maximum size is too large to be of any practical consequence).

Note The ANSI/ISO SQL standard defines transaction-level characteristics, not just individual statementby-statement level characteristics. In the following pages, we ll examine transaction-level isolation, not just statement-level isolation.

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