De-duplication is automatically managed for tables that were partially loaded. In either case, the utility can still resume the import from where it stopped. You can choose to reset the progress state and start the import for a dump again from the beginning, but in this case the utility does not skip objects that were already created and does not manage de-duplication.
If you do this, to ensure a correct import, you must manually remove from the target MySQL instance all previously loaded objects from that dump, including schemas, tables, users, views, triggers, routines, and events. Otherwise, the import stops with an error if an object in the dump files already exists in the target MySQL instance. With appropriate caution, you may use the ignoreExistingObjects option to make the utility report duplicate objects but skip them and continue with the import.
Note that the utility does not check whether the contents of the object in the target MySQL instance and in the dump files are different, so it is possible for the resulting import to contain incorrect or invalid data. Do not change the data in the dump files between a dump stopping and a dump resuming. Resuming a dump after changing the data has undefined behavior and can lead to data inconsistency and data loss. If you need to change the data after partially loading a dump, manually drop all objects that were created during the partial import as listed in the progress state file , then run the dump loading utility with the resetProgress option to start again from the beginning.
To do this, first use the dump loading utility to load only the DDL for the selected table, to create the table on the target server. Then use the parallel table import utility to capture and transform data from the output files for the table, and import it to the target table. Repeat that process as necessary for any other tables where you want to modify the data. Finally, use the dump loading utility to load the DDL and data for any remaining tables that you do not want to modify, excluding the tables that you did modify.
For a description of the procedure, see Modifying Dumped Data. The tables in a dump are loaded in parallel by the number of threads you specify using the threads option, which defaults to 4.
If table data was chunked when the dump was created, multiple threads can be used for a table, otherwise each thread loads one table at a time. The dump loading utility schedules data imports across threads to maximize parallelism. If the dump files were compressed by MySQL Shell's dump utilities, the dump loading utility handles decompression for them.
By default, fulltext indexes for a table are created only after the table is completely loaded, which speeds up the import. You can choose to defer all index creation except the primary index until each table is completely loaded. You can also opt to create all indexes during the table import. You can also choose to disable index creation during the import, and create the indexes afterwards, for example if you want to make changes to the table structure after loading.
For an additional improvement to data loading performance, you can disable the InnoDB redo log on the target MySQL instance during the import. For more information, see Disabling Redo Logging. MySQL 5. This feature list is not backward compatible, but it supports backward compatibility when new features are added in future releases.
This process can include assigning default values and implicit default values to fields, and converting invalid values to the closest valid value for the column data type. See the description of the updateGtidSet option for details. PARs provide a way to let users access a bucket or an object without having their own credentials. Before using this access method, assess the business requirement for and the security ramifications of pre-authenticated access to a bucket or objects in a bucket.
Carefully manage the distribution of PARs. The content of the file is in JSON format, so a text file with a. The following example shows the syntax for loading dump files using a PAR created for all objects in a bucket:. The same syntax is used to load objects in a bucket with a specific prefix, but in this case, the PAR URL includes the prefix:. The manifest file contains a PAR for each item in the dump. Prior to MySQL 8.
When using a PAR created for a manifest file, a progress state file is required. The progress state file can be created in the same prefixed location as the dump files in the Object Storage bucket, or it can be created locally. You can use any user account with the required permissions to create a PAR for the progress state file.
A local progress state file does not require a PAR. Consider using a local progress state file if you do not have the permissions required to create a PAR.
Note that a local progress file does not permit resuming progress from a different location in the event of a failure. Creating a dump with the ociParManifest option enabled generates a manifest file containing a PAR for each item in the dump. Generating PARs for each item in a dump is time consuming for large datasets, and an additional PAR must be created for the manifest file and possibly for a progress state file.
The following example shows the syntax for loading dump files using PARs created for the manifest file and a progress state file. If using a local progress state file, the progressFile option specifies the path to the local progress state file instead of a PAR URL. While the dump is still in progress, the dump loading utility monitors and waits for new additions to the manifest file, rather than to the Object Storage bucket. You must open the global session which can have an X Protocol connection or a classic MySQL protocol connection before running the utility.
The utility opens its own sessions for each thread, copying options such as connection compression and SSL options from the global session, and does not make any further use of the global session. The options are listed in the remaining sections in this topic. If you are importing a dump that is located in the Oracle Cloud Infrastructure Compute instance's filesystem where you are running the utility, url is a string specifying the path to a local directory containing the dump files.
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Related Hot Network Questions. Question feed. Accept all cookies Customize settings. The exception is that the. This permits passwords to be specified in a safer way than on the command line even when --no-defaults is used. To create. Usage scenarios for mysqldump include setting up an entire new MySQL instance including database tables , and replacing data inside an existing instance with existing databases and tables.
The following options let you specify which things to tear down and set up when restoring a dump, by encoding various DDL statements within the dump file. In MySQL 8. Instead, to use --add-drop-database , use --databases with a list of schemas to be dumped, where the list does not include mysql.
This information is not otherwise included in the output from mysqldump. This option is currently relevant only to NDB Cluster tables. This option does not exclude statements creating log file groups or tablespaces from mysqldump output; however, you can use the --no-tablespaces option for this purpose. The following options print debugging information, encode debugging information in the dump file, or let the dump operation proceed regardless of potential problems.
Permit creation of column names that are keywords. This works by prefixing each column name with the table name. Write additional information in the dump file such as program version, server version, and host. This option is enabled by default. To suppress this additional information, use --skip-comments. Write a debugging log. MySQL release binaries provided by Oracle are not built using this option.
Print debugging information and memory and CPU usage statistics when the program exits. If the --comments option is given, mysqldump produces a comment at the end of the dump of the following form:. However, the date causes dump files taken at different times to appear to be different, even if the data are otherwise identical.
The default is --dump-date include the date in the comment. Ignore all errors; continue even if an SQL error occurs during a table dump. One use for this option is to cause mysqldump to continue executing even when it encounters a view that has become invalid because the definition refers to a table that has been dropped.
Without --force , mysqldump exits with an error message. With --force , mysqldump prints the error message, but it also writes an SQL comment containing the view definition to the dump output and continues executing. If the --ignore-error option is also given to ignore specific errors, --force takes precedence. Log warnings and errors by appending them to the named file.
The default is to do no logging. See the description for the --comments option. The following options display information about the mysqldump command itself. The following options change how the mysqldump command represents character data with national language settings. The directory where character sets are installed.
If no character set is specified, mysqldump uses utf8. Turns off the --set-charset setting, the same as specifying --skip-set-charset. The mysqldump command is frequently used to create an empty instance, or an instance including data, on a replica server in a replication configuration. The following options apply to dumping and restoring data on replication source servers and replicas.
From MySQL 8. Both options have the same effect. Use this option before MySQL 8. The options automatically enable --source-data or --master-data. The options are similar to --source-data , except that they are used to dump a replica server to produce a dump file that can be used to set up another server as a replica that has the same source as the dumped server.
These are the replication source server coordinates from which the replica starts replicating. Inconsistencies in the sequence of transactions from the relay log which have been executed can cause the wrong position to be used.
In addition, specifying this option causes the --source-data or --master-data option to be overridden, if used, and effectively ignored. The option value is handled the same way as for --source-data. Setting 2 causes the statement to be written but encased in SQL comments. It has the same effect as --source-data in terms of enabling or disabling other options and in how locking is handled. The options are used to dump a replication source server to produce a dump file that can be used to set up another server as a replica of the source.
These are the replication source server coordinates from which the replica should start replicating after you load the dump file into the replica. If the option value is 1, the statement is not written as a comment and takes effect when the dump file is reloaded.
If no option value is specified, the default value is 1. They also turn on --lock-all-tables , unless --single-transaction also is specified, in which case, a global read lock is acquired only for a short time at the beginning of the dump see the description for --single-transaction.
In all cases, any action on logs happens at the exact moment of the dump. It is also possible to set up a replica by dumping an existing replica of the source, using the --dump-replica or --dump-slave option, which overrides --source-data and --master-data and causes them to be ignored.
This statement prevents new GTIDs from being generated and assigned to the transactions in the dump file as they are executed, so that the original GTIDs for the transactions are used. In MySQL 5. For MySQL 5. If you do not replay any further dump files on the target server, the extraneous GTIDs do not cause any problems with the future operation of the server, but they make it harder to compare or reconcile GTID sets on different servers in the replication topology.
In this case, either remove the statement manually before replaying the dump file, or output the dump file without the statement. You can also include the statement but manually edit it in the dump file to achieve the desired result.
The possible values for the --set-gtid-purged option are as follows:. The default value. If GTIDs are not enabled on the server, the statements are not added to the output. An error occurs if you set this option but GTIDs are not enabled on the server.
Available from MySQL 8. For example, you might prefer to do this if you are migrating data to another server that already has different active databases.
The following options specify how to represent the entire dump file or certain kinds of data in the dump file. They also control whether certain optional information is written to the dump file. Produce more compact output. This option enables the --skip-add-drop-table , --skip-add-locks , --skip-comments , --skip-disable-keys , and --skip-set-charset options. Produce output that is more compatible with other database systems or with older MySQL servers.
The only permitted value for this option is ansi , which has the same meaning as the corresponding option for setting the server SQL mode. See Section 5. Dump binary columns using hexadecimal notation for example, 'abc' becomes 0x It can be disabled with --skip-quote-names , but this option should be given after any option such as --compatible that may enable --quote-names.
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