android barcode scan javascript Managing Database Storage Structures in Software

Drawing QR Code in Software Managing Database Storage Structures

Managing Database Storage Structures
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Figures 7-5 and 7-6 show the windows for creating a tablespace NEWTS with one datafile Clicking the Show SQL button would display this command (the line numbers have been added manually):
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1 2 3 4 5 6 7 CREATE SMALLFILE TABLESPACE "NEWTS" DATAFILE 'D:\APP\ORACLE\ORADATA\ORCL11G\newts01dbf' SIZE 100M AUTOEXTEND ON NEXT 10M MAXSIZE 200M LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO DEFAULT NOCOMPRESS;
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FIGURE 7-5
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The Create Tablespace window
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Create and Manage Tablespaces
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FIGURE 7-6
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The Add Datafile window
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Taking this command line by line:
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Line 1 The tablespace is a SMALLFILE tablespace This means that it can consist of many datafiles The alternative is BIGFILE, in which case it would be impossible to add a second datafile later (though the first file could be resized) The Use Bigfile Tablespace check box in Figure 7-5 controls this The datafile name and location The datafile will be created as 100 MB but when full can automatically extend in 10 MB increments to a maximum of 200 MB By default, automatic extension is not enabled All operations on segments in the tablespace will generate redo; this is the default It is possible to disable redo generation for a very few operations (such as index generation) The tablespace will use bitmaps for allocating extents; this is the default Segments in the tablespace will use bitmaps for tracking block usage; this is the default Segments in the tablespace will not be compressed; this is the default
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Line 2 Line 3 Line 4 Line 5 Line 6 Line 7
7:
Managing Database Storage Structures
Taking the Storage tab shown in Figure 7-5 gives access to options for extent management and compression, as shown in Figure 7-7 When using local extent management (as all tablespaces should), it is possible to enforce a rule that all extents in the tablespace should be the same size This is discussed in the following section If enabling compression, then it can be applied to data only when it is bulk-loaded, or as a part of all DML operations If logging is disabled, this provides a default for the very few operations where redo generation can be disabled, such as index creation Whatever setting is chosen, all DML operations will always generate redo All tablespaces should be locally managedThe older mechanism, known as dictionary managed, was far less efficient and is only supported (and only just) for backward compatibility It has been possible to create locally managed tablespaces, and to convert dictionary-managed tablespaces to locally managed, since release 8i
FIGURE 7-7
Further options for tablespace creation
Create and Manage Tablespaces
A typical tablespace creation statement as executed from the SQL*Plus command line is shown in Figure 7-8, with a query confirming the result The tablespace GLTABS consists of two datafiles, neither of which will autoextend The only deviation from defaults has been to specify a uniform extent size of 5 MB The first query in the figure shows that the tablespace is not a bigfile tablespace; if it were, it would not have been possible to define two datafiles The second query in the figure investigates the TEMP tablespace, used by the database for storing temporary objects It is important to note that temporary tablespaces use tempfiles, not datafiles Tempfiles are listed in the views V$TEMPFILE and DBA_TEMP_FILES, whereas datafiles are listed in V$DATAFILE and DBA_DATA_FILES Also note that the V$ views and the DBA views give different information As the query shows, you can query V$TABLESPACE to find if a tablespace is a bigfile table and V$TEMPFILE (or V$DATAFILE) to find how big a file was at creation time This information is not shown in the DBA views However, the DBA views give the detail of extent management and segment space management The different information available in the views is because some information is stored only in the controlfile (and therefore visible only in V$ views) and some is stored only in the data dictionary (and therefore visible only in DBA views) Other information is duplicated
FIGURE 7-8
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