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on what type of devices can be used and how they should be configured are strict, but not unusual The DBA then groups these physical volumes (known as ASM disks) into logical volumes (known as ASM disk groups) The disk groups are formatted into allocation units, which are contiguous blocks of space on a physical volume The default allocation unit size is 1 MB, but this can be increased up to 64 MB if the nature of the application is such (typically, a data warehouse) that it would benefit from this The lowest level of storage is the physical block This will be determined by the geometry of the disks Every file created on an ASM disk group will always be striped across all the ASM disks that make up the group This is not configurable; it is a performance benefit with no downside and is always implemented Mirroring is configurable but is enabled by default Generally speaking, ASM gives far superior performance to any third-party logical volume ASM stripes les, not manager This is because it is an Oracle-aware volumes Mirroring is optional, striping system that can stripe the files intelligently is not Different file types have different access patterns that make different striping and mirroring strategies appropriate Because ASM stripes at the file level (rather than the volume level, the way a RAID system does), it can handle this much better than an operating system dependent logical volume manager The file-level striping and mirroring also means that additional disks can be added to or removed from a group one at a time if necessary For example, if a volume group consists of just two disks and a third is added, ASM will automatically launch a rebalance operation to bring it into use by restriping the ASM files: it will move a mix of primary and mirrored extents from the existing disks onto the new disk Similarly, if a disk leaves the group (either because of an administration command or a failure), the disk group will immediately rebalance itself to reinstantiate lost mirrors Rebalancing operations occur in the background, while the database is in use A key feature of ASM is that it can work as a clustered file system Historically, many operating systems had problems with making a file system available on two or more nodes concurrently (this is not making files available through a file server it is directly attached storage), as is necessary for RAC database For operating systems that do support clustered file systems, often they are a chargeable option ASM is a clustered file system available on all mainstream platforms and bundled with the Oracle database license ASM gives fantastic performance It works for single-instance databases, as well as RAC databases
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FIGURE 7-3
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Figure 7-3 sketches the ASM structures as an entity-relationship diagram Note the one-to-one mapping of an ASM file to a database file, which could be any of the file types that ASM supports One could draw in a many-to-many relationship between ASM files and ASM disks, but this is resolved via either the ASM disk groups or the allocation units
EXERCISE 7-1 Investigate the Database s Data Storage Structures
In this exercise, you will run queries to document a database s physical structure The commands could be run interactively from SQL*Plus or Database Control, but it would make sense to save them as a script that (with suitable refinements for display format and for site specific customizations) can be run against any database as part of the regular reports on space usage 1 Connect to the database as user SYSTEM 2 Determine the name and size of the controlfile(s):
select name,block_size*file_size_blks bytes from v$controlfile;
3 Determine the name and size of the online redo log file members:
select member,bytes from v$log join v$logfile using (group#);
4 Determine the name and size of the datafiles and the tempfiles:
select name,bytes from v$datafile union all select name,bytes from v$tempfile;
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