$ php maintenance/run.php renameDbPrefix --old "hiwiki_" --new "enwiki_"

Renaming DB prefix for tables of wiki from 'hiwiki_' to 'enwiki_'

Renaming table hiwiki_actor to enwiki_actor
Renaming table hiwiki_archive to enwiki_archive
Renaming table hiwiki_bot_passwords to enwiki_bot_passwords
Renaming table hiwiki_category to enwiki_category
Renaming table hiwiki_categorylinks to enwiki_categorylinks
Renaming table hiwiki_change_tag to enwiki_change_tag
Renaming table hiwiki_change_tag_def to enwiki_change_tag_def
Renaming table hiwiki_comment to enwiki_comment
Renaming table hiwiki_content to enwiki_content
Renaming table hiwiki_content_models to enwiki_content_models
Renaming table hiwiki_externallinks to enwiki_externallinks
Renaming table hiwiki_filearchive to enwiki_filearchive
Renaming table hiwiki_image to enwiki_image
Renaming table hiwiki_imagelinks to enwiki_imagelinks
Renaming table hiwiki_interwiki to enwiki_interwiki
Renaming table hiwiki_ip_changes to enwiki_ip_changes
Renaming table hiwiki_ipblocks to enwiki_ipblocks
Renaming table hiwiki_ipblocks_restrictions to enwiki_ipblocks_restrictions
Renaming table hiwiki_iwlinks to enwiki_iwlinks
Renaming table hiwiki_job to enwiki_job
Renaming table hiwiki_l10n_cache to enwiki_l10n_cache
Renaming table hiwiki_langlinks to enwiki_langlinks
Renaming table hiwiki_log_search to enwiki_log_search
Renaming table hiwiki_logging to enwiki_logging
Renaming table hiwiki_module_deps to enwiki_module_deps
Renaming table hiwiki_objectcache to enwiki_objectcache
Renaming table hiwiki_oldimage to enwiki_oldimage
Renaming table hiwiki_page to enwiki_page
Renaming table hiwiki_page_props to enwiki_page_props
Renaming table hiwiki_page_restrictions to enwiki_page_restrictions
Renaming table hiwiki_pagelinks to enwiki_pagelinks
Renaming table hiwiki_protected_titles to enwiki_protected_titles
Renaming table hiwiki_querycache to enwiki_querycache
Renaming table hiwiki_querycache_info to enwiki_querycache_info
Renaming table hiwiki_querycachetwo to enwiki_querycachetwo
Renaming table hiwiki_recentchanges to enwiki_recentchanges
Renaming table hiwiki_redirect to enwiki_redirect
Renaming table hiwiki_revision to enwiki_revision
Renaming table hiwiki_revision_actor_temp to enwiki_revision_actor_temp
Renaming table hiwiki_revision_comment_temp to enwiki_revision_comment_temp
Renaming table hiwiki_searchindex to enwiki_searchindex
Renaming table hiwiki_site_identifiers to enwiki_site_identifiers
Renaming table hiwiki_site_stats to enwiki_site_stats
Renaming table hiwiki_sites to enwiki_sites
Renaming table hiwiki_slot_roles to enwiki_slot_roles
Renaming table hiwiki_slots to enwiki_slots
Renaming table hiwiki_templatelinks to enwiki_templatelinks
Renaming table hiwiki_text to enwiki_text
Renaming table hiwiki_updatelog to enwiki_updatelog
Renaming table hiwiki_uploadstash to enwiki_uploadstash
Renaming table hiwiki_user to enwiki_user
Renaming table hiwiki_user_former_groups to enwiki_user_former_groups
Renaming table hiwiki_user_groups to enwiki_user_groups
Renaming table hiwiki_user_newtalk to enwiki_user_newtalk
Renaming table hiwiki_user_properties to enwiki_user_properties
Renaming table hiwiki_watchlist to enwiki_watchlist
Renaming table hiwiki_watchlist_expiry to enwiki_watchlist_expiry

Done! [57 tables]