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Figure 3-3. A tablespace containing two data files, three segments, and four extents Figure 3-3 shows a tablespace named USER_DATA. It consists of two data files, user_data01.dbf and user_data02.dbf. It has three segments allocated it: T1, T2, and I1 (probably two tables and an index). The tablespace has four extents allocated in it, and each extent is depicted as a logically contiguous set of database blocks. Segment T1 consists of two extents, one extent in each file. Segments T2 and I1 each have one extent depicted. If we need more space in this tablespace, we could either resize the data files already allocated to the tablespace or we could add a third data file to it. A tablespaces is a logical storage container in Oracle. As developers, we will create segments in tablespaces. We will never get down to the raw file level we don t specify that we want our extents to be allocated in a specific file (we can, but in general we don t). Rather, we create objects in tablespaces and Oracle takes care of the rest. If at some point in the future, the DBA decides to move our data files around on disk to more evenly distribute I/O, that is OK with us. It will not affect our processing at all.

It must be restored to a meaningful value once deserialization is complete, and that occurs in the parent object s FieldDataDeserialized() method, which is invoked by the OnDeserializedHandler() method The result is that a child object can always get a reference to its immediate parent through its Parent property This reference is used automatically in some cases, as I discuss later in the Parent Editable Collection section..

Basic Cisco Router/Switch NTP Configuration Cisco routers and switches are typically deployed as secondary timeservers, which means that even as they serve time to other devices and peer with them as well, those among

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In summary, the hierarchy of storage in Oracle is as follows: 1. 2. A database is made up of one or more tablespaces. A tablespace is made up of one or more data files. These files might be cooked files in a file system, raw partitions, ASM managed database files, or a file on a clustered file system. A tablespace contains segments. A segment (TABLE, INDEX, and so on) is made up of one or more extents. A segment exists in a tablespace, but may have data in many data files within that tablespace. An extent is a logically contiguous set of blocks on disk. An extent is in a single tablespace and, furthermore, is always in a single file within that tablespace. A block is the smallest unit of allocation in the database. A block is the smallest unit of I/O used by a database.

4. 5.

The n-level undo functionality of CSLA .NET is discussed in detail in 13. It is also discussed to some degree in 10 because n-level undo is used to provide important functionality for data binding. There are several points in n-level undo and data binding, where parent and child objects must interact with each other. I won t discuss the details here; you can refer to s 10 and 13.

Before we move on, let s look at one more topic related to tablespaces: how extents are managed in a tablespace. Prior to Oracle 8.1.5, there was only one method for managing the allocation of extents within a tablespace: a dictionary-managed tablespace. That is, the space within a tablespace was managed in data dictionary tables, in much the same way you d manage accounting data, perhaps with a DEBIT and CREDIT table. On the debit side, we have all of the extents allocated to objects. On the credit side, we have all of the free extents available for use. When an object needed another extent, it would ask the system for one. Oracle would then go to its data dictionary tables, run some queries, find the space (or not), and then update a row in one table (or remove it all together) and insert a row into another.

Oracle managed space in very much the same way you write your applications: by modifying data and moving it around This SQL, executed on your behalf in the background to get the additional space, is referred to as recursive SQL Your SQL INSERT statement caused other recursive SQL to be executed to get more space This recursive SQL can be quite expensive if it is done frequently Such updates to the data dictionary must be serialized; they can t be done simultaneously They are something to be avoided In earlier releases of Oracle, we would see this space management issue this recursive SQL overhead most often in temporary tablespaces (this was before the introduction of real temporary tablespaces created via the CREATE TEMPORARY TABLESPACE command).

Space would frequently be allocated (we would have to delete from one dictionary table and insert into another) and deallocated (we would put the rows we just moved back where they were initially) These operations would tend to serialize, dramatically decreasing concurrency and increasing wait times In version 73 (way back in 1995 now!), Oracle introduced the concept of a true temporary tablespace, a new tablespace type dedicated to just storing temporary data, to help alleviate this issue Prior to this special tablespace type, temporary data was managed in the same tablespaces as persistent data and treated in much the same way as permanent data was A temporary tablespace was one in which you could create no permanent objects of your own This was fundamentally the only difference; the space was still managed in the data dictionary tables.

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