MySQL  8.0.27
Source Code Documentation
server.h
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22 
23 #ifndef DD_UPGRADE__SERVER_H_INCLUDED
24 #define DD_UPGRADE__SERVER_H_INCLUDED
25 
26 #include <stdio.h>
27 
28 #include "typelib.h"
29 
30 class THD;
31 class Time_zone;
32 
34 enum enum_upgrade_mode : int {
39 };
40 
41 namespace dd {
42 namespace upgrade {
43 /**
44  Upgrades/restores the system tables to defaults of the current MySQL version.
45  This is a replacement for the mysql_upgrade client.
46 
47  There are four SQL scripts executed:
48  1. mysql_system_tables.sql - Creates the system tables
49  2. mysql_system_tables_fix.sql - Updates the system table
50  3. mysql_system_tables_data_fix.sql - Fills the system tables with meta data
51  4. mysql_sys_schema.sql - Create and/or updates the sys schema
52 
53  Then the system tables are checked by executing CHECK TABLE SQL statements.
54 
55  This function is called during startup if the MySQL version present in
56  DD_properties in not the same as the current MySQL version. This function can
57  also be called if the server is started with --upgrade=FORCE option.
58 
59  If the server is started with --upgrade=MINIMAL option with a newer MySQL
60  server version Z on an older data directory of MySQL server version X, this
61  function checks if server upgrade has been skipped before using another MySQL
62  server version Y such that Y != Z, X < Y and X < Z. If yes, we abort.
63 
64  The server upgrade ends with updating the MYSQLD_UPGRADED_VERSION value in
65  DD_properties to the current server version (MYSQL_VERSION_ID).
66 
67  @param[in] thd Thread handle.
68 
69  @retval false ON SUCCESS
70  @retval true ON FAILURE
71 */
72 bool upgrade_system_schemas(THD *thd);
73 
75 
77 
78 } // namespace upgrade
79 
80 } // namespace dd
81 #endif // DD_UPGRADE__SERVER_H_INCLUDED
For each client connection we create a separate thread with THD serving as a thread/connection descri...
Definition: sql_class.h:821
This class represents abstract time zone and provides basic interface for MYSQL_TIME <-> my_time_t co...
Definition: tztime.h:48
bool I_S_upgrade_required()
Definition: server.cc:876
bool no_server_upgrade_required()
Definition: server.cc:871
bool upgrade_system_schemas(THD *thd)
Upgrades/restores the system tables to defaults of the current MySQL version.
Definition: server.cc:803
The version of the current data dictionary table definitions.
Definition: dictionary_client.h:42
Definition: typelib.h:34
TYPELIB upgrade_mode_typelib
Definition: server.cc:72
enum_upgrade_mode
Definition: server.h:34
@ UPGRADE_NONE
Definition: server.h:35
@ UPGRADE_MINIMAL
Definition: server.h:36
@ UPGRADE_AUTO
Definition: server.h:37
@ UPGRADE_FORCE
Definition: server.h:38