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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.

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There are a couple of caveats to using this formula to account for dates that land on a number line. In that case, before you perform the calculation, the values of Month and Year may need to be altered: for the months of January (1) and February (2), you must add 13 to Month and subtract 1 from Year; for all other months you simply add 1 to Month to return the correct value. The Day value to be used is always the day of the month. Thus, the equation applied to January 1, 1970, is as follows:

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.

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.

In this type name, the dot character () is used as a separator for namespace names and type names The FCL uses this type-naming schema because most NET languages, including C# and VB NET, use it, too Even though a C++/CLI developer has to write System::Int32 with two colons (::) instead, it is important to know about the other naming schema used by the FCL, especially if you search the MSDN documentation or the Web for information about a type..

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).

It is quite common to have tablespaces that are 100GB in size coexisting in the same database with tablespaces as small as 1GB or even much smaller The data files that contain the data for the tablespaces in a database together constitute the total amount of physical space assigned to a particular database (The size of a tablespace is the sum of the sizes of the data files that contain its data, and if you add up the sizes of the tablespaces or the sizes of all the data files, you will get the size of the database itself) If you re running out of space in your database because you re adding new data, you need to create more tablespaces with new data files, add new data files to existing tablespaces, or make the existing data files of a tablespace larger.

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