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Transaction IDs wrap around, per my proposal of 13-Aug-01. More

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documentation to come, but the code is all here.  initdb forced.
This commit is contained in:
Tom Lane
2001-08-26 16:56:03 +00:00
parent d1ee78f296
commit bc7d37a525
29 changed files with 617 additions and 171 deletions
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44
src/backend/commands/dbcommands.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/dbcommands.c,v 1.78 2001/08/10 18:57:34 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/dbcommands.c,v 1.79 2001/08/26 16:55:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -39,8 +39,9 @@
/* non-export function prototypes */
static bool get_db_info(const char *name, Oid *dbIdP, int4 *ownerIdP,
int *encodingP, bool *dbIsTemplateP,
Oid *dbLastSysOidP, char *dbpath);
int *encodingP, bool *dbIsTemplateP, Oid *dbLastSysOidP,
TransactionId *dbVacuumXidP, TransactionId *dbFrozenXidP,
char *dbpath);
static bool get_user_info(Oid use_sysid, bool *use_super, bool *use_createdb);
static char *resolve_alt_dbpath(const char *dbpath, Oid dboid);
static bool remove_dbdirs(const char *real_loc, const char *altloc);
@ -65,6 +66,8 @@ createdb(const char *dbname, const char *dbpath,
int src_encoding;
bool src_istemplate;
Oid src_lastsysoid;
TransactionId src_vacuumxid;
TransactionId src_frozenxid;
char src_dbpath[MAXPGPATH];
Relation pg_database_rel;
HeapTuple tuple;
@ -91,7 +94,7 @@ createdb(const char *dbname, const char *dbpath,
* idea, so accept possibility of race to create. We will check again
* after we grab the exclusive lock.
*/
if (get_db_info(dbname, NULL, NULL, NULL, NULL, NULL, NULL))
if (get_db_info(dbname, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL))
elog(ERROR, "CREATE DATABASE: database \"%s\" already exists", dbname);
/*
@ -101,7 +104,9 @@ createdb(const char *dbname, const char *dbpath,
dbtemplate = "template1"; /* Default template database name */
if (!get_db_info(dbtemplate, &src_dboid, &src_owner, &src_encoding,
&src_istemplate, &src_lastsysoid, src_dbpath))
&src_istemplate, &src_lastsysoid,
&src_vacuumxid, &src_frozenxid,
src_dbpath))
elog(ERROR, "CREATE DATABASE: template \"%s\" does not exist",
dbtemplate);
@ -208,8 +213,10 @@ createdb(const char *dbname, const char *dbpath,
pg_database_rel = heap_openr(DatabaseRelationName, AccessExclusiveLock);
/* Check to see if someone else created same DB name meanwhile. */
if (get_db_info(dbname, NULL, NULL, NULL, NULL, NULL, NULL))
if (get_db_info(dbname, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL))
{
/* Don't hold lock while doing recursive remove */
heap_close(pg_database_rel, AccessExclusiveLock);
remove_dbdirs(nominal_loc, alt_loc);
elog(ERROR, "CREATE DATABASE: database \"%s\" already exists", dbname);
}
@ -227,6 +234,8 @@ createdb(const char *dbname, const char *dbpath,
new_record[Anum_pg_database_datistemplate - 1] = BoolGetDatum(false);
new_record[Anum_pg_database_datallowconn - 1] = BoolGetDatum(true);
new_record[Anum_pg_database_datlastsysoid - 1] = ObjectIdGetDatum(src_lastsysoid);
new_record[Anum_pg_database_datvacuumxid - 1] = TransactionIdGetDatum(src_vacuumxid);
new_record[Anum_pg_database_datfrozenxid - 1] = TransactionIdGetDatum(src_frozenxid);
/* no nulls here, GetRawDatabaseInfo doesn't like them */
new_record[Anum_pg_database_datpath - 1] =
DirectFunctionCall1(textin, CStringGetDatum(dbpath ? dbpath : ""));
@ -307,7 +316,7 @@ dropdb(const char *dbname)
pgdbrel = heap_openr(DatabaseRelationName, AccessExclusiveLock);
if (!get_db_info(dbname, &db_id, &db_owner, NULL,
&db_istemplate, NULL, dbpath))
&db_istemplate, NULL, NULL, NULL, dbpath))
elog(ERROR, "DROP DATABASE: database \"%s\" does not exist", dbname);
if (!use_super && GetUserId() != db_owner)
@ -397,13 +406,15 @@ dropdb(const char *dbname)
static bool
get_db_info(const char *name, Oid *dbIdP, int4 *ownerIdP,
int *encodingP, bool *dbIsTemplateP,
Oid *dbLastSysOidP, char *dbpath)
int *encodingP, bool *dbIsTemplateP, Oid *dbLastSysOidP,
TransactionId *dbVacuumXidP, TransactionId *dbFrozenXidP,
char *dbpath)
{
Relation relation;
ScanKeyData scanKey;
HeapScanDesc scan;
HeapTuple tuple;
bool gottuple;
AssertArg(name);
@ -414,12 +425,11 @@ get_db_info(const char *name, Oid *dbIdP, int4 *ownerIdP,
F_NAMEEQ, NameGetDatum(name));
scan = heap_beginscan(relation, 0, SnapshotNow, 1, &scanKey);
if (!HeapScanIsValid(scan))
elog(ERROR, "Cannot begin scan of %s", DatabaseRelationName);
tuple = heap_getnext(scan, 0);
if (HeapTupleIsValid(tuple))
gottuple = HeapTupleIsValid(tuple);
if (gottuple)
{
Form_pg_database dbform = (Form_pg_database) GETSTRUCT(tuple);
text *tmptext;
@ -428,7 +438,7 @@ get_db_info(const char *name, Oid *dbIdP, int4 *ownerIdP,
/* oid of the database */
if (dbIdP)
*dbIdP = tuple->t_data->t_oid;
/* uid of the owner */
/* sysid of the owner */
if (ownerIdP)
*ownerIdP = dbform->datdba;
/* multibyte encoding */
@ -440,6 +450,12 @@ get_db_info(const char *name, Oid *dbIdP, int4 *ownerIdP,
/* last system OID used in database */
if (dbLastSysOidP)
*dbLastSysOidP = dbform->datlastsysoid;
/* limit of vacuumed XIDs */
if (dbVacuumXidP)
*dbVacuumXidP = dbform->datvacuumxid;
/* limit of frozen XIDs */
if (dbFrozenXidP)
*dbFrozenXidP = dbform->datfrozenxid;
/* database path (as registered in pg_database) */
if (dbpath)
{
@ -462,7 +478,7 @@ get_db_info(const char *name, Oid *dbIdP, int4 *ownerIdP,
heap_endscan(scan);
heap_close(relation, AccessShareLock);
return HeapTupleIsValid(tuple);
return gottuple;
}
static bool