Update most documentation for NoteDb

Remove outdated references to ReviewDb. Where ambiguous terms like
"database" are used, make sure they are still technically accurate, or
else remove them.

After this change, all documentation should be up to date with respect
to the database backend, with the exception of note-db.txt itself.

Change-Id: I7134087dc56070788e81ada6ac504b3c8fe84c4c

Documentation/cmd-create-project.txt

@@ -28,9 +28,8 @@ _ssh_ -p <port> <host> _gerrit create-project_
 == DESCRIPTION
 Creates a new bare Git repository under `gerrit.basePath`, using
 the project name supplied.  The newly created repository is empty
-(has no commits), but is registered in the Gerrit database so that
+(has no commits), and the initial content may either be uploaded for
-the initial commit may be uploaded for review, or initial content
+review, or pushed directly to a branch.
-can be pushed directly into a branch.
 
 If replication is enabled, this command also connects to each of
 the configured remote systems over SSH and uses command line git

Documentation/cmd-flush-caches.txt

@@ -16,7 +16,7 @@ Clear an in-memory cache, forcing Gerrit to reconsult the ground
 truth when it needs the information again.
 
 Flushing a cache may be necessary if an administrator modifies
-database records directly in the database, rather than going through
+NoteDb metadata directly in a repository, rather than going through
 the Gerrit web interface.
 
 If no options are supplied, defaults to `--all`.

Documentation/cmd-index.txt

@@ -71,7 +71,7 @@ link:cmd-ls-projects.html[gerrit ls-projects]::
 	List projects visible to the caller.
 
 link:cmd-query.html[gerrit query]::
-	Query the change database.
+	Query the change search index.
 
 'gerrit receive-pack'::
 	'Deprecated alias for `git receive-pack`.'

Documentation/cmd-ls-user-refs.txt

@@ -32,8 +32,8 @@ Administrators
 --user::
 -u::
 	Required; User for which the visible refs should be listed. Gerrit
-	will query the database to find matching users, so the
+	will query the index to find matching users, so the full
-	full identity/name does not need to be specified.
+	identity/name does not need to be specified.
 
 --only-refs-heads::
 	Only list the refs found under refs/heads/*

Documentation/cmd-query.txt

@@ -1,7 +1,7 @@
 = gerrit query
 
 == NAME
-gerrit query - Query the change database
+gerrit query - Query the change search index
 
 == SYNOPSIS
 [verse]
@@ -24,7 +24,7 @@ _ssh_ -p <port> <host> _gerrit query_
 
 == DESCRIPTION
 
-Queries the change database and returns results describing changes
+Queries the change search index and returns results describing changes
 that match the input query.  More recently updated changes appear
 before older changes, which is the same order presented in the
 web interface.  For each matching change, the result contains data

Documentation/cmd-review.txt

@@ -27,7 +27,7 @@ _ssh_ -p <port> <host> _gerrit review_
 == DESCRIPTION
 Updates the current user's approval status of the specified patch
 sets and/or submits them for merging, sending out email
-notifications and updating the database.
+notifications and updating code review metadata.
 
 Patch sets may be specified in 'CHANGEID,PATCHSET' format, such as
 '8242,2', or 'COMMIT' format.

Documentation/config-gerrit.txt

@@ -46,8 +46,8 @@ Changing this parameter requires to migrate database using the
 link:pgm-MigrateAccountPatchReviewDb.html[MigrateAccountPatchReviewDb] program.
 Migration cannot be done while the server is running.
 +
-Also note that the db_name has to be a new db and not reusing gerrit's own review database,
+Also note that the db_name has to be a new db and not reusing an old ReviewDb
-otherwise gerrit's init will remove the table.
+database from a former 2.x site, otherwise gerrit's init will remove the table.
 
 ----
 [accountPatchReviewDb]
@@ -805,11 +805,10 @@ cache `"accounts"`::
 +
 Cache entries contain important details of an active user, including
 their display name, preferences, and known email addresses. Entry
-information is obtained from the `accounts` database table.
+information is obtained from NoteDb data in the `All-Users` repo.
 
 +
-If direct updates are made to any of these database tables, this
+If direct updates are made to `All-Users`, this cache should be flushed.
-cache should be flushed.
 
 cache `"adv_bases"`::
 +
@@ -2623,8 +2622,7 @@ Defaults to no limit.
 +
 Maximum number of leaf terms to allow in a query. Too-large queries may
 perform poorly, so setting this option causes query parsing to fail fast
-before attempting to send them to the secondary index. Should this limit
+before attempting to send them to the secondary index.
-be reached, database is used instead of index as applicable.
 +
 When the index type is `LUCENE`, also sets the maximum number of clauses
 permitted per BooleanQuery. This is so that all enforced query limits
@@ -3318,9 +3316,9 @@ Common examples:
 [[note-db]]
 === Section noteDb
 
-NoteDb is the next generation of Gerrit storage backend, currently powering
+NoteDb is the Git-based database storage backend for Gerrit. For more
-`googlesource.com`. For more information, including how to migrate your data,
+information, including how to migrate data from an older Gerrit version, see the
-see the link:note-db.html[documentation].
+link:note-db.html[documentation].
 
 [[notedb.accounts.sequenceBatchSize]]notedb.accounts.sequenceBatchSize::
 +

Documentation/config-robot-comments.txt

@@ -36,7 +36,6 @@ Robot comments can be dropped by deleting this ref.
 
 == Limitations
 
-* Robot comments are only supported with NoteDb, but not with ReviewDb.
 * Robot comments are not displayed in the web UI yet.
 * There is no support for draft robot comments, but robot comments are
   always published and visible to everyone who can see the change.

Documentation/dev-contributing.txt

@@ -250,7 +250,6 @@ back and consult this section when creating them.
 Here are some design level objectives that you should keep in mind
 when coding:
 
-  * ORM entity objects should match exactly one row in the database.
   * Most client pages should perform only one RPC to load so as to
     keep latencies down.  Exceptions would apply to RPCs which need
     to load large data sets if splitting them out will help the
@@ -269,10 +268,11 @@ when coding:
   * Don't leave repository objects (git or schema) open.  A .close()
     after every open should be placed in a finally{} block.
   * Don't leave UI components, which can cause new actions to occur,
-    enabled during RPCs which update the DB.  This is to prevent
+    enabled during RPCs which update Git repositories, including NoteDb.
-    people from submitting actions more than once when operating
+    This is to prevent people from submitting actions more than once
-    on slow links.  If the action buttons are disabled, they cannot
+    when operating on slow links.  If the action buttons are disabled,
-    be resubmitted and the user can see that Gerrit is still busy.
+    they cannot be resubmitted and the user can see that Gerrit is still
+    busy.
   * ...and so is Guava (previously known as Google Collections).
 
 

Documentation/dev-plugins.txt

@@ -325,10 +325,10 @@ from the Section.Factory rather than from an injected Config object.
 
 Plugins' InitSteps are executed during the "Gerrit Plugin init" phase, after
 the extraction of the plugins embedded in the distribution .war file into
-`$GERRIT_SITE/plugins` and before the DB Schema initialization or upgrade.
+`$GERRIT_SITE/plugins` and before the site initialization or upgrade.
 
-A plugin's InitStep cannot refer to Gerrit's DB Schema or any other Gerrit
+A plugin's InitStep cannot refer to any Gerrit runtime objects injected at
-runtime objects injected at startup.
+startup.
 
 [source,java]
 ----
@@ -1573,9 +1573,8 @@ public Object apply(RevisionResource rcrs, Input in) {
   // schedule a build
   [...]
   // update change
-  ReviewDb db = dbProvider.get();
   try (BatchUpdate bu = batchUpdateFactory.create(
-      db, project.getNameKey(), user, TimeUtil.nowTs())) {
+      project.getNameKey(), user, TimeUtil.nowTs())) {
     bu.addOp(change.getId(), new BatchUpdate.Op() {
       @Override
       public boolean updateChange(ChangeContext ctx) {

Documentation/install.txt

@@ -61,8 +61,7 @@ the notes under link:dev-readme.html[developer setup].
 
 Gerrit stores configuration files, the server's SSH keys, and the
 managed Git repositories under a local directory, typically referred
-to as `'$site_path'`.  If the embedded H2 database is being used,
+to as `'$site_path'`.
-its data files will also be stored under this directory.
 
 You also have to decide where to store your server side git repositories. This
 can either be a relative path under `'$site_path'` or an absolute path
@@ -87,11 +86,10 @@ have any privileges, you may have to manually create the directory first and
 then give ownership of that location to the `'gerrit'` user.
 
 If run from an interactive terminal, the init command will prompt through a
-series of configuration questions, including gathering information
+series of configuration questions.  If the terminal is not interactive,
-about the database created above.  If the terminal is not interactive,
+running the init command will choose some reasonable default selections.
-running the init command will choose some reasonable default selections,
+Once the init phase is complete, you can review your settings in the file
-and will use the embedded H2 database. Once the init phase is complete,
+`'$site_path/etc/gerrit.config'`.
-you can review your settings in the file `'$site_path/etc/gerrit.config'`.
 
 When running the init command, additional JARs might be downloaded to
 support optional selected functionality.  If a download fails a URL will

Documentation/metrics.txt

@@ -106,10 +106,6 @@ Each queue provides the following metrics:
 * `sshd/sessions/created`: Rate of new SSH sessions.
 * `sshd/sessions/authentication_failures`: Rate of SSH authentication failures.
 
-=== SQL connections
-
-* `sql/connection_pool/connections`: SQL database connections.
-
 === Topics
 
 * `topic/cross_project_submit`: number of cross-project topic submissions.

Documentation/pgm-LocalUsernamesToLowerCase.txt

@@ -47,7 +47,7 @@ it must be run by itself.
 
 == CONTEXT
 This command can only be run on a server which has direct
-connectivity to the metadata database.
+connectivity to the managed Git repositories.
 
 == EXAMPLES
 To convert the local username of every account to lower case:

Documentation/pgm-init.txt

@@ -28,7 +28,7 @@ for some basic setup prior to writing default configuration files
 into a newly created `$site_path`.
 
 If run in an existing `$site_path`, init upgrades existing resources
-(e.g. DB schema, plugins) as necessary.
+(e.g. NoteDb schema, plugins) as necessary.
 
 == OPTIONS
 -b::
@@ -100,8 +100,7 @@ objects these SQL statements must be executed manually.
 	folder.
 
 == CONTEXT
-This command can only be run on a server which has direct
+This command can only be run on a server which has direct local access to the
-connectivity to the metadata database, and local access to the
 managed Git repositories.
 
 GERRIT

Documentation/pgm-rulec.txt

@@ -33,8 +33,7 @@ named `rules-'SHA1'.jar` in `'$site_path'/cache/rules`.
 	Compile rules for the specified project.
 
 == CONTEXT
-This command can only be run on a server which has direct
+This command can only be run on a server which has local access to the
-connectivity to the metadata database, and local access to the
 managed Git repositories.
 
 Caching needs to be enabled. See

Documentation/user-upload.txt

@@ -732,7 +732,7 @@ client invoked by the end-user, or by `repo upload`.  This allows
 Gerrit to provide magical refs, such as `+refs/for/*+` for new
 change submission and `+refs/changes/*+` for change replacement.
 When a push request is received to create a ref in one of these
-namespaces Gerrit performs its own logic to update the database,
+namespaces Gerrit performs its own logic to update the review metadata,
 and then lies to the client about the result of the operation.
 A successful result causes the client to believe that Gerrit has
 created the ref, but in reality Gerrit hasn't created the ref at all.