Alldata 9.5 Import Disc 4

Proper storage design is important for any NAS.Please read through this entire chapter before configuring storagedisks. Features are described to help make it clear which arebeneficial for particular uses, and caveats or hardware restrictionswhich limit usefulness.

Unlike a password, a passphrase can contain spaces and is typically aseries of words. A good passphrase is easy to remember (like the lineto a song or piece of literature) but hard to guess (people you knowshould not be able to guess the passphrase). Remember thispassphrase. An encrypted pool cannot be reimported without it. Inother words, if the passphrase is forgotten, the data on the pool canbecome inaccessible if it becomes necessary to reimport the pool.Protect this passphrase, as anyone who knows it could reimport theencrypted pool, thwarting the reason for encrypting the disks in thefirst place.

alldata 9.5 import disc 4

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After the passphrase is set, the name of this button changes toChange Passphrase and the Root Password is alsorequired to change the passphrase. After setting or changing thepassphrase, it is important to immediately create a new recovery keyby clicking the Add Recovery Key button. This way, if thepassphrase is forgotten, the associated recovery key can be usedinstead.

The Export/Disconnect Pool screen provides the optionsDestroy data on this pool?,Confirm export/disconnect, andDelete configuration of shares that used this pool?. Anencrypted pool also displays a button to DOWNLOAD KEY forthat pool.

To export/disconnect the pool and keep the data and configurations of shares,set only Confirm export/disconnectand click EXPORT/DISCONNECT. This makes it possible to re-importthe pool at a later time. For example, when moving a pool fromone system to another, perform this export/disconnect action first toflush any unwritten data to disk, write data to the disk indicatingthat the export was done, and remove all knowledge of the pool fromthis system.

Use the Disks dropdown menu to select the disks to decrypt.Click Browse to select an encryption key to upload.Enter the Passphrase associated with the key, then clickNEXT to continue importing the pool.

In FreeNAS, deduplication can be enabled during dataset creation. Beforewarned that there is no way to undedup the data within a datasetonce deduplication is enabled, as disabling deduplication hasNO EFFECT on existing data. The more data written to a deduplicateddataset, the more RAM it requires. When the system starts storing theDDTs (dedup tables) on disk because they no longer fit into RAM,performance craters. Further, importing an unclean pool can requirebetween 3-5 GiB of RAM per terabyte of deduped data, and if the systemdoes not have the needed RAM, it will panic. The only solution is to addmore RAM or recreate the pool. Think carefully before enabling dedup!This articleprovides a good description of the value versus cost considerationsfor deduplication.

Setting permissions is an important aspect of managing data access. Theweb interface is meant to set the initialpermissions for a pool or dataset to make it available as ashare. Once a share is available, the client operating system isused to fine-tune the permissions of the files and directories thatare created by the client.

Use the drop-down menu to select the disk to import, select the typeof filesystem on the disk, and browse to the ZFS dataset that will holdthe copied data. If the MSDOSFS filesystem is selected, anadditional MSDOSFS locale drop-down menu will display. Usethis menu to select the locale if non-ASCII characters are present onthedisk.

Refresher using cheat sheets that summarize many R functions is available here: It is important to know the different types of R objects: scalars, vectors, data frames, matrix, and lists.

There are many different ways to get data into R. You can enter data manually (see below), or semi-manually (see below). You can read data into R from a local file or a file on the internet. You can also use R to retrieve data from databases, local or remote. The most important thing is to read data set into R correctly. A dataset not read in correctly will never be analyzed or visualized correctly.

pg_upgrade does its best to make sure the old and new clusters are binary-compatible, e.g., by checking for compatible compile-time settings, including 32/64-bit binaries. It is important that any external modules are also binary compatible, though this cannot be checked by pg_upgrade.

The dump file set is made up of one or more disk files that contain table data, database object metadata, and control information. The files are written in a proprietary, binary format. During an import operation, the Oracle Data Pump Import utility uses these files to locate each database object in the dump file set.

Several system schemas cannot be exported, because they are not user schemas; they contain Oracle-managed data and metadata. Examples of schemas that are not exported include SYS, ORDSYS, and MDSYS. Scondary objects are also not exported, because the CREATE INDEX at import time will recreate them.

Cross-schema references are not exported unless the referenced schema is also specified in the list of schemas to be exported. For example, a trigger defined on a table within one of the specified schemas, but that resides in a schema not explicitly specified, is not exported. Also, external type definitions upon which tables in the specified schemas depend are not exported. In such a case, it is expected that the type definitions already exist in the target instance at import time.

You must have the DATAPUMP_EXP_FULL_DATABASE role to specify tables that are not in your own schema. Note that type definitions for columns are not exported in table mode. It is expected that the type definitions already exist in the target instance at import time. Also, as in schema exports, cross-schema references are not exported.

To recover tables and table partitions, you can also use RMAN backups and the RMAN RECOVER TABLE command. During this process, RMAN creates (and optionally imports) a Data Pump export dump file that contains the recovered objects. Refer to Oracle Database Backup and Recovery Guide for more information about transporting data across platforms.

In transportable tablespace mode, only the metadata for the tables (and their dependent objects) within a specified set of tablespaces is exported. The tablespace data files are copied in a separate operation. Then, a transportable tablespace import is performed to import the dump file containing the metadata and to specify the data files to use.

This warning points out that in order to successfully import such a transportable tablespace job, the target database wallet must contain a copy of the same database master key used in the source database when performing the export. Using the ENCRYPTION_PASSWORD parameter during the export and import eliminates this requirement.

METADATA_ONLY unloads only database object definitions; no table row data is unloaded. Be aware that if you specify CONTENT=METADATA_ONLY, then afterward, when the dump file is imported, any index or table statistics imported from the dump file are locked after the import.

GROUP_PARTITION_TABLE_DATA: Tells Data Pump to unload all table data in one operation rather than unload each table partition as a separate operation. As a result, the definition of the table will not matter at import time because Import will see one partition of data that will be loaded into the entire table.

VERIFY_STREAM_FORMAT: Validates the format of a data stream before it is written to the Data Pump dump file. The verification checks for a valid format for the stream after it is generated but before it is written to disk. This assures that there are no errors when the dump file is created, which in turn helps to assure that there will not be errors when the stream is read at import time.

Although it is possible to specify multiple files using the DUMPFILE parameter, the export job can only require a subset of those files to hold the exported data. The dump file set displayed at the end of the export job shows exactly which files were used. It is this list of files that is required to perform an import operation using this dump file set. Any files that were not used can be discarded.

DUAL mode creates a dump file set that can later be imported either transparently or by specifying a password that was used when the dual-mode encrypted dump file set was created. When you later import the dump file set created in DUAL mode, you can use either the wallet or the password that was specified with the ENCRYPTION_PASSWORD parameter. DUAL mode is best suited for cases in which the dump file set will be imported on-site using the wallet, but which may also need to be imported offsite where the wallet is not available.

PASSWORD mode requires that you provide a password when creating encrypted dump file sets. You will need to provide the same password when you import the dump file set. PASSWORD mode requires that you also specify the ENCRYPTION_PASSWORD parameter. The PASSWORD mode is best suited for cases in which the dump file set will be imported into a different or remote database, but which must remain secure in transit.

TRANSPARENT mode enables you to create an encrypted dump file set without any intervention from a database administrator (DBA), provided the required wallet is available. Therefore, the ENCRYPTION_PASSWORD parameter is not required. The parameter will, in fact, cause an error if it is used in TRANSPARENT mode. This encryption mode is best suited for cases in which the dump file set is imported into the same database from which it was exported. 2ff7e9595c