= MigrateAccountPatchReviewDb

== NAME
MigrateAccountPatchReviewDb - Migrates AccountPatchReviewDb from one database
backend to another.

== SYNOPSIS
[verse]
--
_java_ -jar gerrit.war MigrateAccountPatchReviewDb
  -d <SITE_PATH>
  [--sourceUrl] [--chunkSize]
--

== DESCRIPTION
Migrates AccountPatchReviewDb from one database backend to another. The
AccountPatchReviewDb is a database used to store the user file reviewed flags.

This command is only intended to be run if the configuration parameter
link:config-gerrit.html#accountPatchReviewDb.url[accountPatchReviewDb.url]
is set or changed.

To migrate AccountPatchReviewDb:

* Stop Gerrit
* Configure new value for link:config-gerrit.html#accountPatchReviewDb.url[accountPatchReviewDb.url]
* Migrate data using this command
* Start Gerrit

[NOTE]
When using MySQL, the file_name column length in the account_patch_reviews table will be shortened
from the standard 4096 characters down to 255 characters. This is due to a
link:https://dev.mysql.com/doc/refman/5.7/en/innodb-restrictions.html[MySQL limitation]
on the max size of 767 bytes for each column in an index.

== OPTIONS

-d::
--site-path::
	Location of the `gerrit.config` file, and all other per-site
	configuration data, supporting libraries and log files.

--sourceUrl::
	Url of source database. Only need to be specified if the source is not H2.

--chunkSize::
	Chunk size of fetching from source and pushing to target on each time.
	Defaults to 100000.

== CONTEXT
This command can only be run on a server which has direct
connectivity to the database.

== EXAMPLES
To migrate from H2 to the database specified by
link:config-gerrit.html#accountPatchReviewDb.url[accountPatchReviewDb.url]
in gerrit.config:

----
	$ java -jar gerrit.war MigrateAccountPatchReviewDb -d site_path
----

== SEE ALSO

* Configuration parameter link:config-gerrit.html#accountPatchReviewDb.url[accountPatchReviewDb.url]

GERRIT
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