Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-21051

Store and read foreign key info into/from FRM files

    XMLWordPrintable

Details

    • Task
    • Status: Closed (View Workflow)
    • Critical
    • Resolution: Duplicate
    • N/A
    • Server
    • None

    Description

      1. Introduce Foreign_key_io class which creates/parses binary stream containing foreign key structures. Referenced tables store there only hints about foreign tables (their db and name), they restore full info from the corresponding tables.

      Foreign_key_io is stored under new EXTRA2_FOREIGN_KEY_INFO field in extra2 section of FRM file.

      2. Modify mysql_prepare_create_table() to generate names for foreign keys. Until InnoDB storage of foreign keys is removed, FK names must be unique across the database: the FK name must be based on table name.

      3. Keep stored data in sync on DDL changes. Referenced tables update their foreign hints after following operations on foreign tables:

      • RENAME TABLE
      • DROP TABLE
      • CREATE TABLE
      • ADD FOREIGN KEY
      • DROP FOREIGN KEY

      Foreign tables update their foreign info after following operations on referenced tables:

      • RENAME TABLE
      • RENAME COLUMN

      4. To achieve 3. there must be ability to rewrite extra2 section of FRM file without full reparse. FRM binary is built from primary structures like HA_CREATE_INFO and cannot be built from TABLE_SHARE.

      Use shadow write and rename like fast_alter_partition_table() does.

      Attachments

        Issue Links

          Activity

            People

              midenok Aleksey Midenkov
              midenok Aleksey Midenkov
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Git Integration

                  Error rendering 'com.xiplink.jira.git.jira_git_plugin:git-issue-webpanel'. Please contact your Jira administrators.