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ndb_import imports CSV-formatted data, such
as that produced by mysqldump
--tab
, directly into
NDB
using the NDB API.
ndb_import requires a connection to an NDB
management server (ndb_mgmd) to function; it
does not require a connection to a MySQL Server.
Usage
ndb_import db_name file_name options
ndb_import requires two arguments.
db_name
is the name of the database
where the table into which to import the data is found;
file_name
is the name of the CSV file
from which to read the data; this must include the path to this
file if it is not in the current directory. The name of the file
must match that of the table; the file's extension, if any,
is not taken into consideration. Options supported by
ndb_import include those for specifying field
separators, escapes, and line terminators, and are described
later in this section. ndb_import must be
able to connect to an NDB Cluster management server; for this
reason, there must be an unused [api]
slot in
the cluster config.ini
file.
To duplicate an existing table that uses a different storage
engine, such as InnoDB
, as an
NDB
table, use the mysql
client to perform a
SELECT INTO
OUTFILE
statement to export the existing table to a
CSV file, then to execute a
CREATE TABLE
LIKE
statement to create a new table having the same
structure as the existing table, then perform
ALTER TABLE ...
ENGINE=NDB
on the new table; after this, from the
system shell, invoke ndb_import to load the
data into the new NDB
table. For example, an
existing InnoDB
table named
myinnodb_table
in a database named
myinnodb
can be exported into an
NDB
table named
myndb_table
in a database named
myndb
as shown here, assuming that you are
already logged in as a MySQL user with the appropriate
privileges:
In the mysql client:
- mysql> EXIT;
- Bye
- shell>
Once the target database and table have been created, a running mysqld is no longer required. You can stop it using mysqladmin shutdown or another method before proceeding, if you wish.
In the system shell:
# if you are not already in the MySQL bin directory: shell> cd path-to-mysql-bin-dir shell> ndb_import myndb /tmp/myndb_table.csv --fields-optionally-enclosed-by='"' \ --fields-terminated-by="," --fields-escaped-by='\\'
The output should resemble what is shown here:
job-1 import myndb.myndb_table from /tmp/myndb_table.csv job-1 [running] import myndb.myndb_table from /tmp/myndb_table.csv job-1 [success] import myndb.myndb_table from /tmp/myndb_table.csv job-1 imported 19984 rows in 0h0m9s at 2277 rows/s jobs summary: defined: 1 run: 1 with success: 1 with failure: 0 shell>
The following table includes options that are specific to ndb_import. Additional descriptions follow the table. For options common to most NDB Cluster programs (including ndb_import), see Section 22.4.31, “Options Common to NDB Cluster Programs — Options Common to NDB Cluster Programs”.
Table 22.345 Command-line options for the ndb_import program
Format | Description | Added, Deprecated, or Removed |
---|---|---|
Dump core on any fatal error; used for debugging | All NDB 8.0 releases |
|
For table with hidden PK, specify autoincrement increment. See mysqld | All NDB 8.0 releases |
|
For table with hidden PK, specify autoincrement offset. See mysqld | All NDB 8.0 releases |
|
For table with hidden PK, specify number of autoincrement values that are prefetched. See mysqld | All NDB 8.0 releases |
|
Number of cluster connections to create | All NDB 8.0 releases |
|
When job fails, continue to next job | All NDB 8.0 releases |
|
Number of threads, per data node, executing database operations | All NDB 8.0 releases |
|
Error insert type, for testing purposes; use "list" to obtain all possible values | All NDB 8.0 releases |
|
Error insert delay in milliseconds; random variation is added | All NDB 8.0 releases |
|
Same as FIELDS ENCLOSED BY option for LOAD DATA statements. For CSV input this is same as using --fields-optionally-enclosed-by | All NDB 8.0 releases |
|
Same as FIELDS ESCAPED BY option for LOAD DATA statements | All NDB 8.0 releases |
|
Same as FIELDS OPTIONALLY ENCLOSED BY option for LOAD DATA statements | All NDB 8.0 releases |
|
Same as FIELDS TERMINATED BY option for LOAD DATA statements. | All NDB 8.0 releases |
|
Number of milliseconds to sleep waiting for more to do | All NDB 8.0 releases |
|
Number of times to re-try before idlesleep | All NDB 8.0 releases |
|
Ignore first # lines in input file. Used to skip a non-data header. | All NDB 8.0 releases |
|
Input type: random or csv | All NDB 8.0 releases |
|
Number of threads processing input. Must be 2 or more if --input-type is csv. | All NDB 8.0 releases |
|
Preserve state files | All NDB 8.0 releases |
|
Same as LINES TERMINATED BY option for LOAD DATA statements | All NDB 8.0 releases |
|
Set internal logging level; for debugging and development | All NDB 8.0 releases |
|
Import only this number of input data rows; default is 0, which imports all rows | All NDB 8.0 releases |
|
Periodically print status of running job if something has changed (status, rejected rows, temporary errors). Value 0 disables. Value 1 prints any change seen. Higher values reduce status printing exponentially up to some pre-defined limit. | All NDB 8.0 releases |
|
Run database operations as batches, in single transactions | All NDB 8.0 releases |
|
Do not use distribution key hint to select data node (TC) | All NDB 8.0 releases |
|
A db execution batch is a set of transactions and operations sent to NDB kernel. This option limits NDB operations (including blob operations) in a db execution batch. Therefore it also limits number of asynch transactions. Value 0 is not valid | All NDB 8.0 releases |
|
Limit bytes in execution batch (default 0 = no limit) | All NDB 8.0 releases |
|
Output type: ndb is default, null used for testing | All NDB 8.0 releases |
|
Number of threads processing output or relaying database operations | All NDB 8.0 releases |
|
Align I/O buffers to given size | All NDB 8.0 releases |
|
Size of I/O buffers as multiple of page size. CSV input worker allocates a double-sized buffer | All NDB 8.0 releases |
|
Timeout per poll for completed asynchonous transactions; polling continues until all polls are completed, or error occurs | All NDB 8.0 releases |
|
Limit number of rejected rows (rows with permanent error) in data load. Default is 0 which means that any rejected row causes a fatal error. The row exceeding the limit is also added to *.rej | All NDB 8.0 releases |
|
If job aborted (temporary error, user interrupt), resume with rows not yet processed | All NDB 8.0 releases |
|
Limit rows in row queues (default 0 = no limit); must be 1 or more if --input-type is random | All NDB 8.0 releases |
|
Limit bytes in row queues (0 = no limit) | All NDB 8.0 releases |
|
Where to write state files; currect directory is default | All NDB 8.0 releases |
|
Save performance and statistics information in
*.sto and *.stt
files |
All NDB 8.0 releases |
|
Number of milliseconds to sleep between temporary errors | All NDB 8.0 releases |
|
Number of times a transaction can fail due to a temporary error, per execution batch; 0 means any temporary error is fatal. Such errors do not cause any rows to be written to .rej file | All NDB 8.0 releases |
|
Enable verbose output | All NDB 8.0 releases |
-
Property Value Command-Line Format --abort-on-error
Type Boolean Default Value FALSE
Dump core on any fatal error; used for debugging only.
-
Property Value Command-Line Format --ai-increment=#
Type Integer Default Value 1
Minimum Value 1
Maximum Value 4294967295
For a table with a hidden primary key, specify the autoincrement increment, like the
auto_increment_increment
system variable does in the MySQL Server. -
Property Value Command-Line Format --ai-offset=#
Type Integer Default Value 1
Minimum Value 1
Maximum Value 4294967295
For a table with hidden primary key, specify the autoincrement offset. Similar to the
auto_increment_offset
system variable. -
Property Value Command-Line Format --ai-prefetch-sz=#
Type Integer Default Value 1024
Minimum Value 1
Maximum Value 4294967295
For a table with a hidden primary key, specify the number of autoincrement values that are prefetched. Behaves like the
ndb_autoincrement_prefetch_sz
system variable does in the MySQL Server. -
Property Value Command-Line Format --connections=#
Type Integer Default Value 1
Minimum Value 1
Maximum Value 4294967295
Number of cluster connections to create.
-
Property Value Command-Line Format --continue
Type Boolean Default Value FALSE
When a job fails, continue to the next job.
-
Property Value Command-Line Format --db-workers=#
Type Integer Default Value 4
Minimum Value 1
Maximum Value 4294967295
Number of threads, per data node, executing database operations.
-
Property Value Command-Line Format --errins-type=name
Type Enumeration Default Value [none]
Valid Values stopjob
stopall
sighup
sigint
list
Error insert type; use
list
as thename
value to obtain all possible values. This option is used for testing purposes only. -
Property Value Command-Line Format --errins-delay=#
Type Integer Default Value 1000
Minimum Value 0
Maximum Value 4294967295
Error insert delay in milliseconds; random variation is added. This option is used for testing purposes only.
-
Property Value Command-Line Format --fields-enclosed-by=char
Type String Default Value [none]
This works in the same way as the
FIELDS ENCLOSED BY
option does for theLOAD DATA
statement, specifying a character to be interpeted as quoting field values. For CSV input, this is the same as--fields-optionally-enclosed-by
. -
Property Value Command-Line Format --fields-escaped-by=name
Type String Default Value \
Specify an escape character in the same way as the
FIELDS ESCAPED BY
option does for the SQLLOAD DATA
statement. --fields-optionally-enclosed-by
=char
Property Value Command-Line Format --fields-optionally-enclosed-by=char
Type String Default Value [none]
This works in the same way as the
FIELDS OPTIONALLY ENCLOSED BY
option does for theLOAD DATA
statement, specifying a character to be interpeted as optionally quoting field values. For CSV input, this is the same as--fields-enclosed-by
.-
Property Value Command-Line Format --fields-terminated-by=char
Type String Default Value \t
This works in the same way as the
FIELDS TERMINATED BY
option does for theLOAD DATA
statement, specifying a character to be interpeted as the field separator. -
Property Value Command-Line Format --idlesleep=#
Type Integer Default Value 1
Minimum Value 1
Maximum Value 4294967295
Number of milliseconds to sleep waiting for more work to perform.
-
Property Value Command-Line Format --idlespin=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 4294967295
Number of times to retry before sleeping.
-
Property Value Command-Line Format --ignore-lines=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 4294967295
Cause ndb_import to ignore the first
#
lines of the input file. This can be employed to skip a file header that does not contain any data. -
Property Value Command-Line Format --input-type=name
Type Enumeration Default Value csv
Valid Values random
csv
Set the type of input type. The default is
csv
;random
is intended for testing purposes only. . -
Property Value Command-Line Format --input-workers=#
Type Integer Default Value 4
Minimum Value 1
Maximum Value 4294967295
Set the number of threads processing input.
-
Property Value Command-Line Format --keep-state
Type Boolean Default Value false
By default, ndb_import removes all state files (except non-empty
*.rej
files) when it completes a job. Specify this option (nor argument is required) to force the program to retain all state files instead. -
Property Value Command-Line Format --lines-terminated-by=name
Type String Default Value \n
This works in the same way as the
LINES TERMINATED BY
option does for theLOAD DATA
statement, specifying a character to be interpeted as end-of-line. -
Property Value Command-Line Format --log-level=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 2
Performs internal logging at the given level. This option is intended primarily for internal and development use.
In debug builds of NDB only, the logging level can be set using this option to a maximum of 4.
-
Property Value Command-Line Format --max-rows=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 4294967295
Import only this number of input data rows; the default is 0, which imports all rows.
-
Property Value Command-Line Format --monitor=#
Type Integer Default Value 2
Minimum Value 0
Maximum Value 4294967295
Periodically print the status of a running job if something has changed (status, rejected rows, temporary errors). Set to 0 to disable this reporting. Setting to 1 prints any change that is seen. Higher values reduce the frequency of this status reporting.
-
Property Value Command-Line Format --no-asynch
Type Boolean Default Value FALSE
Run database operations as batches, in single transactions.
-
Property Value Command-Line Format --no-hint
Type Boolean Default Value FALSE
Do not use distribution key hinting to select a data node.
-
Property Value Command-Line Format --opbatch=#
Type Integer Default Value 256
Minimum Value 1
Maximum Value 4294967295
Set a limit on the number of operations (including blob operations), and thus the number of asynchronous transactions, per execution batch.
-
Property Value Command-Line Format --opbytes=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 4294967295
Set a limit on the number of bytes per execution batch. Use 0 for no limit.
-
Property Value Command-Line Format --output-type=name
Type Enumeration Default Value ndb
Valid Values null
Set the output type.
ndb
is the default.null
is used only for testing. -
Property Value Command-Line Format --output-workers=#
Type Integer Default Value 2
Minimum Value 1
Maximum Value 4294967295
Set the number of threads processing output or relaying database operations.
-
Property Value Command-Line Format --pagesize=#
Type Integer Default Value 4096
Minimum Value 1
Maximum Value 4294967295
Align I/O buffers to the given size.
-
Property Value Command-Line Format --pagecnt=#
Type Integer Default Value 64
Minimum Value 1
Maximum Value 4294967295
Set the size of I/O buffers as multiple of page size. The CSV input worker allocates buffer that is doubled in size.
-
Property Value Command-Line Format --polltimeout=#
Type Integer Default Value 1000
Minimum Value 1
Maximum Value 4294967295
Set a timeout per poll for completed asynchonous transactions; polling continues until all polls are completed, or until an error occurs.
-
Property Value Command-Line Format --rejects=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 4294967295
Limit the number of rejected rows (rows with permanent errors) in the data load. The default is 0, which means that any rejected row causes a fatal error. Any rows causing the limit to be exceeded are added to the
.rej
file.The limit imposed by this option is effective for the duration of the current run. A run restarted using
--resume
is considered a “new” run for this purpose. -
Property Value Command-Line Format --resume
Type Boolean Default Value FALSE
If a job is aborted (due to a temporary db error or when interrupted by the user), resume with any rows not yet processed.
-
Property Value Command-Line Format --rowbatch=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 4294967295
Set a limit on the number of rows per row queue. Use 0 for no limit.
-
Property Value Command-Line Format --rowbytes=#
Type Integer Default Value 262144
Minimum Value 0
Maximum Value 4294967295
Set a limit on the number of bytes per row queue. Use 0 for no limit.
-
Property Value Command-Line Format --stats
Type Boolean Default Value false
Save information about options related to performance and other internal statistics in files named
*.sto
and*.stt
. These files are always kept on successful completion (even if--keep-state
is not also specified). -
Property Value Command-Line Format --state-dir=name
Type String Default Value .
Where to write the state files (
,tbl_name
.map
,tbl_name
.rej
, andtbl_name
.res
) produced by a run of the program; the default is the current directory.tbl_name
.stt -
Property Value Command-Line Format --tempdelay=#
Type Integer Default Value 10
Minimum Value 0
Maximum Value 4294967295
Number of milliseconds to sleep between temporary errors.
-
Property Value Command-Line Format --temperrors=#
Type Integer Default Value 0
Minimum Value 0
Maximum Value 4294967295
Number of times a transaction can fail due to a temporary error, per execution batch. The default is 0, which means that any temporary error is fatal. Temporary errors do not cause any rows to be added to the
.rej
file. -
Property Value Command-Line Format --verbose
Type Boolean Default Value false
Enable verbose output.
As with LOAD DATA
, options for
field and line formatting much match those used to create the
CSV file, whether this was done using
SELECT INTO ...
OUTFILE
, or by some other means. There is no
equivalent to the LOAD DATA
statement STARTING WITH
option.
ndb_import was added in NDB 7.6.2.
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