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Unlogged sequences 

Add support for unlogged sequences.  Unlike for unlogged tables, this
is not a performance feature.  It allows sequences associated with
unlogged tables to be excluded from replication.

A new subcommand ALTER SEQUENCE ... SET LOGGED/UNLOGGED is added.

An identity/serial sequence now automatically gets and follows the
persistence level (logged/unlogged) of its owning table.  (The
sequences owned by temporary tables were already temporary through the
separate mechanism in RangeVarAdjustRelationPersistence().)  But you
can still change the persistence of an owned sequence separately.
Also, pg_dump and pg_upgrade preserve the persistence of existing
sequences.

Discussion: https://www.postgresql.org/message-id/flat/04e12818-2f98-257c-b926-2845d74ed04f%402ndquadrant.com
This commit is contained in:
Peter Eisentraut 2022-04-07 16:13:23 +02:00
parent bab588cd5c
commit 344d62fb9a
16 changed files with 237 additions and 31 deletions
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12
doc/src/sgml/ref/alter_sequence.sgml
View File

@ -31,6 +31,7 @@ ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
[ RESTART [ [ WITH ] <replaceable class="parameter">restart</replaceable> ] ]
[ CACHE <replaceable class="parameter">cache</replaceable> ] [ [ NO ] CYCLE ]
[ OWNED BY { <replaceable class="parameter">table_name</replaceable>.<replaceable class="parameter">column_name</replaceable> | NONE } ]
ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> SET { LOGGED | UNLOGGED }
ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> OWNER TO { <replaceable class="parameter">new_owner</replaceable> | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable>
ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> SET SCHEMA <replaceable class="parameter">new_schema</replaceable>
@ -237,6 +238,17 @@ ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> S
</listitem>
</varlistentry>
<varlistentry>
<term><literal>SET { LOGGED | UNLOGGED }</literal></term>
<listitem>
<para>
This form changes the sequence from unlogged to logged or vice-versa
(see <xref linkend="sql-createsequence"/>). It cannot be applied to a
temporary sequence.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>OWNED BY</literal> <replaceable class="parameter">table_name</replaceable>.<replaceable class="parameter">column_name</replaceable></term>
<term><literal>OWNED BY NONE</literal></term>

6
doc/src/sgml/ref/alter_table.sgml
View File

@ -753,6 +753,12 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
(see <xref linkend="sql-createtable-unlogged"/>). It cannot be applied
to a temporary table.
</para>
<para>
This also changes the persistence of any sequences linked to the table
(for identity or serial columns). However, it is also possible to
change the persistence of such sequences separately.
</para>
</listitem>
</varlistentry>

23
doc/src/sgml/ref/create_sequence.sgml
View File

@ -21,7 +21,7 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
CREATE [ TEMPORARY | TEMP ] SEQUENCE [ IF NOT EXISTS ] <replaceable class="parameter">name</replaceable>
CREATE [ { TEMPORARY | TEMP } | UNLOGGED ] SEQUENCE [ IF NOT EXISTS ] <replaceable class="parameter">name</replaceable>
[ AS <replaceable class="parameter">data_type</replaceable> ]
[ INCREMENT [ BY ] <replaceable class="parameter">increment</replaceable> ]
[ MINVALUE <replaceable class="parameter">minvalue</replaceable> | NO MINVALUE ] [ MAXVALUE <replaceable class="parameter">maxvalue</replaceable> | NO MAXVALUE ]
@ -92,6 +92,27 @@ SELECT * FROM <replaceable>name</replaceable>;
</listitem>
</varlistentry>
<varlistentry>
<term><literal>UNLOGGED</literal></term>
<listitem>
<para>
If specified, the sequence is created as an unlogged sequence. Changes
to unlogged sequences are not written to the write-ahead log. They are
not crash-safe: an unlogged sequence is automatically reset to its
initial state after a crash or unclean shutdown. Unlogged sequences are
also not replicated to standby servers.
</para>
<para>
Unlike unlogged tables, unlogged sequences do not offer a significant
performance advantage. This option is mainly intended for sequences
associated with unlogged tables via identity columns or serial columns.
In those cases, it usually wouldn't make sense to have the sequence
WAL-logged and replicated but not its associated table.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>IF NOT EXISTS</literal></term>
<listitem>

5
doc/src/sgml/ref/create_table.sgml
View File

@ -215,6 +215,11 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
Any indexes created on an unlogged table are automatically unlogged as
well.
</para>
<para>
If this is specified, any sequences created together with the unlogged
table (for identity or serial columns) are also created as unlogged.
</para>
</listitem>
</varlistentry>

7
doc/src/sgml/ref/pg_dump.sgml
View File

@ -981,9 +981,10 @@ PostgreSQL documentation
<term><option>--no-unlogged-table-data</option></term>
<listitem>
<para>
Do not dump the contents of unlogged tables. This option has no
effect on whether or not the table definitions (schema) are dumped;
it only suppresses dumping the table data. Data in unlogged tables
Do not dump the contents of unlogged tables and sequences. This
option has no effect on whether or not the table and sequence
definitions (schema) are dumped; it only suppresses dumping the table
and sequence data. Data in unlogged tables and sequences
is always excluded when dumping from a standby server.
</para>
</listitem>

58
src/backend/commands/sequence.c
View File

@ -30,6 +30,7 @@
#include "catalog/objectaccess.h"
#include "catalog/pg_sequence.h"
#include "catalog/pg_type.h"
#include "catalog/storage_xlog.h"
#include "commands/defrem.h"
#include "commands/sequence.h"
#include "commands/tablecmds.h"
@ -95,6 +96,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
static SeqTableData *last_used_seq = NULL;
static void fill_seq_with_data(Relation rel, HeapTuple tuple);
static void fill_seq_fork_with_data(Relation rel, HeapTuple tuple, ForkNumber forkNum);
static Relation lock_and_open_sequence(SeqTable seq);
static void create_seq_hashtable(void);
static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@ -133,12 +135,6 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
bool pgs_nulls[Natts_pg_sequence];
int i;
/* Unlogged sequences are not implemented -- not clear if useful. */
if (seq->sequence->relpersistence == RELPERSISTENCE_UNLOGGED)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("unlogged sequences are not supported")));
/*
* If if_not_exists was given and a relation with the same name already
* exists, bail out. (Note: we needn't check this when not if_not_exists,
@ -492,9 +488,33 @@ SetSequence(Oid seq_relid, bool transactional, int64 last_value, int64 log_cnt,
/*
* Initialize a sequence's relation with the specified tuple as content
*
* This handles unlogged sequences by writing to both the main and the init
* fork as necessary.
*/
static void
fill_seq_with_data(Relation rel, HeapTuple tuple)
{
fill_seq_fork_with_data(rel, tuple, MAIN_FORKNUM);
if (rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED)
{
SMgrRelation srel;
srel = smgropen(rel->rd_node, InvalidBackendId);
smgrcreate(srel, INIT_FORKNUM, false);
log_smgrcreate(&rel->rd_node, INIT_FORKNUM);
fill_seq_fork_with_data(rel, tuple, INIT_FORKNUM);
FlushRelationBuffers(rel);
smgrclose(srel);
}
}
/*
* Initialize a sequence's relation fork with the specified tuple as content
*/
static void
fill_seq_fork_with_data(Relation rel, HeapTuple tuple, ForkNumber forkNum)
{
Buffer buf;
Page page;
@ -503,7 +523,7 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
/* Initialize first page of relation with special magic number */
buf = ReadBuffer(rel, P_NEW);
buf = ReadBufferExtended(rel, forkNum, P_NEW, RBM_NORMAL, NULL);
Assert(BufferGetBlockNumber(buf) == 0);
page = BufferGetPage(buf);
@ -549,7 +569,7 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
elog(ERROR, "failed to add sequence tuple to page");
/* XLOG stuff */
if (RelationNeedsWAL(rel))
if (RelationNeedsWAL(rel) || forkNum == INIT_FORKNUM)
{
xl_seq_rec xlrec;
XLogRecPtr recptr;
@ -682,6 +702,28 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
return address;
}
void
SequenceChangePersistence(Oid relid, char newrelpersistence)
{
SeqTable elm;
Relation seqrel;
Buffer buf;
HeapTupleData seqdatatuple;
init_sequence(relid, &elm, &seqrel);
/* check the comment above nextval_internal()'s equivalent call. */
if (RelationNeedsWAL(seqrel))
GetTopTransactionId();
(void) read_seq_tuple(seqrel, &buf, &seqdatatuple);
RelationSetNewRelfilenode(seqrel, newrelpersistence);
fill_seq_with_data(seqrel, &seqdatatuple);
UnlockReleaseBuffer(buf);
relation_close(seqrel, NoLock);
}
void
DeleteSequenceTuple(Oid relid)
{

32
src/backend/commands/tablecmds.c
View File

@ -319,6 +319,7 @@ struct DropRelationCallbackState
#define ATT_COMPOSITE_TYPE 0x0010
#define ATT_FOREIGN_TABLE 0x0020
#define ATT_PARTITIONED_INDEX 0x0040
#define ATT_SEQUENCE 0x0080
/*
* ForeignTruncateInfo
@ -4660,7 +4661,7 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
pass = AT_PASS_MISC;
break;
case AT_SetLogged: /* SET LOGGED */
ATSimplePermissions(cmd->subtype, rel, ATT_TABLE);
ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_SEQUENCE);
if (tab->chgPersistence)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
@ -4675,7 +4676,7 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
pass = AT_PASS_MISC;
break;
case AT_SetUnLogged: /* SET UNLOGGED */
ATSimplePermissions(cmd->subtype, rel, ATT_TABLE);
ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_SEQUENCE);
if (tab->chgPersistence)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
@ -5425,7 +5426,7 @@ ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
* and assigns a new relfilenode, we automatically create or drop an
* init fork for the relation as appropriate.
*/
if (tab->rewrite > 0)
if (tab->rewrite > 0 && tab->relkind != RELKIND_SEQUENCE)
{
/* Build a temporary relation and copy data */
Relation OldHeap;
@ -5546,6 +5547,11 @@ ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
InvokeObjectPostAlterHook(RelationRelationId, tab->relid, 0);
}
else if (tab->rewrite > 0 && tab->relkind == RELKIND_SEQUENCE)
{
if (tab->chgPersistence)
SequenceChangePersistence(tab->relid, tab->newrelpersistence);
}
else
{
/*
@ -5564,6 +5570,23 @@ ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
if (tab->newTableSpace)
ATExecSetTableSpace(tab->relid, tab->newTableSpace, lockmode);
}
/*
* Also change persistence of owned sequences, so that it matches the
* table persistence.
*/
if (tab->chgPersistence)
{
List *seqlist = getOwnedSequences(tab->relid);
ListCell *lc;
foreach(lc, seqlist)
{
Oid seq_relid = lfirst_oid(lc);
SequenceChangePersistence(seq_relid, tab->newrelpersistence);
}
}
}
/*
@ -6224,6 +6247,9 @@ ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets)
case RELKIND_FOREIGN_TABLE:
actual_target = ATT_FOREIGN_TABLE;
break;
case RELKIND_SEQUENCE:
actual_target = ATT_SEQUENCE;
break;
default:
actual_target = 0;
break;

1
src/backend/parser/parse_utilcmd.c
View File

@ -445,6 +445,7 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
seqstmt = makeNode(CreateSeqStmt);
seqstmt->for_identity = for_identity;
seqstmt->sequence = makeRangeVar(snamespace, sname, -1);
seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
seqstmt->options = seqoptions;
/*

15
src/bin/pg_dump/pg_dump.c
View File

@ -16570,6 +16570,7 @@ dumpSequence(Archive *fout, const TableInfo *tbinfo)
PQExpBuffer query = createPQExpBuffer();
PQExpBuffer delqry = createPQExpBuffer();
char *qseqname;
TableInfo *owning_tab = NULL;
qseqname = pg_strdup(fmtId(tbinfo->dobj.name));
@ -16678,7 +16679,7 @@ dumpSequence(Archive *fout, const TableInfo *tbinfo)
if (tbinfo->is_identity_sequence)
{
TableInfo *owning_tab = findTableByOid(tbinfo->owning_tab);
owning_tab = findTableByOid(tbinfo->owning_tab);
appendPQExpBuffer(query,
"ALTER TABLE %s ",
@ -16696,7 +16697,9 @@ dumpSequence(Archive *fout, const TableInfo *tbinfo)
else
{
appendPQExpBuffer(query,
"CREATE SEQUENCE %s\n",
"CREATE %sSEQUENCE %s\n",
tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
"UNLOGGED " : "",
fmtQualifiedDumpable(tbinfo));
if (strcmp(seqtype, "bigint") != 0)
@ -16722,7 +16725,15 @@ dumpSequence(Archive *fout, const TableInfo *tbinfo)
cache, (cycled ? "\n CYCLE" : ""));
if (tbinfo->is_identity_sequence)
{
appendPQExpBufferStr(query, "\n);\n");
if (tbinfo->relpersistence != owning_tab->relpersistence)
appendPQExpBuffer(query,
"ALTER SEQUENCE %s SET %s;\n",
fmtQualifiedDumpable(tbinfo),
tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
"UNLOGGED" : "LOGGED");
}
else
appendPQExpBufferStr(query, ";\n");

8
src/bin/psql/describe.c
View File

@ -1681,8 +1681,12 @@ describeOneTableDetails(const char *schemaname,
printTableInit(&cont, &myopt, title.data, 7, numrows);
printTableInitialized = true;
printfPQExpBuffer(&title, _("Sequence \"%s.%s\""),
schemaname, relationname);
if (tableinfo.relpersistence == 'u')
printfPQExpBuffer(&title, _("Unlogged sequence \"%s.%s\""),
schemaname, relationname);
else
printfPQExpBuffer(&title, _("Sequence \"%s.%s\""),
schemaname, relationname);
printTableAddHeader(&cont, gettext_noop("Type"), true, 'l');
printTableAddHeader(&cont, gettext_noop("Start"), true, 'r');

5
src/bin/psql/tab-complete.c
View File

@ -2116,7 +2116,7 @@ psql_completion(const char *text, int start, int end)
/* ALTER SEQUENCE <name> */
else if (Matches("ALTER", "SEQUENCE", MatchAny))
COMPLETE_WITH("AS", "INCREMENT", "MINVALUE", "MAXVALUE", "RESTART",
"NO", "CACHE", "CYCLE", "SET SCHEMA", "OWNED BY",
"NO", "CACHE", "CYCLE", "SET", "OWNED BY",
"OWNER TO", "RENAME TO");
/* ALTER SEQUENCE <name> AS */
else if (TailMatches("ALTER", "SEQUENCE", MatchAny, "AS"))
@ -2124,6 +2124,9 @@ psql_completion(const char *text, int start, int end)
/* ALTER SEQUENCE <name> NO */
else if (Matches("ALTER", "SEQUENCE", MatchAny, "NO"))
COMPLETE_WITH("MINVALUE", "MAXVALUE", "CYCLE");
/* ALTER SEQUENCE <name> SET */
else if (Matches("ALTER", "SEQUENCE", MatchAny, "SET"))
COMPLETE_WITH("SCHEMA", "LOGGED", "UNLOGGED");
/* ALTER SERVER <name> */
else if (Matches("ALTER", "SERVER", MatchAny))
COMPLETE_WITH("VERSION", "OPTIONS", "OWNER TO", "RENAME TO");

1
src/include/commands/sequence.h
View File

@ -58,6 +58,7 @@ extern List *sequence_options(Oid relid);
extern ObjectAddress DefineSequence(ParseState *pstate, CreateSeqStmt *stmt);
extern ObjectAddress AlterSequence(ParseState *pstate, AlterSeqStmt *stmt);
extern void SequenceChangePersistence(Oid relid, char newrelpersistence);
extern void DeleteSequenceTuple(Oid relid);
extern void ResetSequence(Oid seq_relid);
extern void SetSequence(Oid seq_relid, bool transactional, int64 last_value, int64 log_cnt, bool is_called);

61
src/test/recovery/t/014_unlogged_reinit.pl
View File

@ -18,16 +18,27 @@ $node->init;
$node->start;
my $pgdata = $node->data_dir;
# Create an unlogged table to test that forks other than init are not
# copied.
# Create an unlogged table and an unlogged sequence to test that forks
# other than init are not copied.
$node->safe_psql('postgres', 'CREATE UNLOGGED TABLE base_unlogged (id int)');
$node->safe_psql('postgres', 'CREATE UNLOGGED SEQUENCE seq_unlogged');
my $baseUnloggedPath = $node->safe_psql('postgres',
q{select pg_relation_filepath('base_unlogged')});
my $seqUnloggedPath = $node->safe_psql('postgres',
q{select pg_relation_filepath('seq_unlogged')});
# Test that main and init forks exist.
ok(-f "$pgdata/${baseUnloggedPath}_init", 'init fork in base exists');
ok(-f "$pgdata/$baseUnloggedPath", 'main fork in base exists');
ok(-f "$pgdata/${baseUnloggedPath}_init", 'table init fork exists');
ok(-f "$pgdata/$baseUnloggedPath", 'table main fork exists');
ok(-f "$pgdata/${seqUnloggedPath}_init", 'sequence init fork exists');
ok(-f "$pgdata/$seqUnloggedPath", 'sequence main fork exists');
# Test the sequence
is($node->safe_psql('postgres', "SELECT nextval('seq_unlogged')"),
1, 'sequence nextval');
is($node->safe_psql('postgres', "SELECT nextval('seq_unlogged')"),
2, 'sequence nextval again');
# Create an unlogged table in a tablespace.
@ -44,6 +55,19 @@ my $ts1UnloggedPath = $node->safe_psql('postgres',
ok(-f "$pgdata/${ts1UnloggedPath}_init", 'init fork in tablespace exists');
ok(-f "$pgdata/$ts1UnloggedPath", 'main fork in tablespace exists');
# Create more unlogged sequences for testing.
$node->safe_psql('postgres', 'CREATE UNLOGGED SEQUENCE seq_unlogged2');
# This rewrites the sequence relation in AlterSequence().
$node->safe_psql('postgres', 'ALTER SEQUENCE seq_unlogged2 INCREMENT 2');
$node->safe_psql('postgres', "SELECT nextval('seq_unlogged2')");
$node->safe_psql('postgres',
'CREATE UNLOGGED TABLE tab_seq_unlogged3 (a int GENERATED ALWAYS AS IDENTITY)'
);
# This rewrites the sequence relation in ResetSequence().
$node->safe_psql('postgres', 'TRUNCATE tab_seq_unlogged3 RESTART IDENTITY');
$node->safe_psql('postgres', 'INSERT INTO tab_seq_unlogged3 DEFAULT VALUES');
# Crash the postmaster.
$node->stop('immediate');
@ -54,6 +78,8 @@ append_to_file("$pgdata/${baseUnloggedPath}_fsm", 'TEST_FSM');
# Remove main fork to test that it is recopied from init.
unlink("$pgdata/${baseUnloggedPath}")
or BAIL_OUT("could not remove \"${baseUnloggedPath}\": $!");
unlink("$pgdata/${seqUnloggedPath}")
or BAIL_OUT("could not remove \"${seqUnloggedPath}\": $!");
# the same for the tablespace
append_to_file("$pgdata/${ts1UnloggedPath}_vm", 'TEST_VM');
@ -64,13 +90,25 @@ unlink("$pgdata/${ts1UnloggedPath}")
$node->start;
# check unlogged table in base
ok(-f "$pgdata/${baseUnloggedPath}_init", 'init fork in base still exists');
ok(-f "$pgdata/$baseUnloggedPath", 'main fork in base recreated at startup');
ok( -f "$pgdata/${baseUnloggedPath}_init",
'table init fork in base still exists');
ok(-f "$pgdata/$baseUnloggedPath",
'table main fork in base recreated at startup');
ok(!-f "$pgdata/${baseUnloggedPath}_vm",
'vm fork in base removed at startup');
ok( !-f "$pgdata/${baseUnloggedPath}_fsm",
'fsm fork in base removed at startup');
# check unlogged sequence
ok(-f "$pgdata/${seqUnloggedPath}_init", 'sequence init fork still exists');
ok(-f "$pgdata/$seqUnloggedPath", 'sequence main fork recreated at startup');
# Test the sequence after restart
is($node->safe_psql('postgres', "SELECT nextval('seq_unlogged')"),
1, 'sequence nextval after restart');
is($node->safe_psql('postgres', "SELECT nextval('seq_unlogged')"),
2, 'sequence nextval after restart again');
# check unlogged table in tablespace
ok( -f "$pgdata/${ts1UnloggedPath}_init",
'init fork still exists in tablespace');
@ -81,4 +119,15 @@ ok( !-f "$pgdata/${ts1UnloggedPath}_vm",
ok( !-f "$pgdata/${ts1UnloggedPath}_fsm",
'fsm fork in tablespace removed at startup');
# Test other sequences
is($node->safe_psql('postgres', "SELECT nextval('seq_unlogged2')"),
1, 'altered sequence nextval after restart');
is($node->safe_psql('postgres', "SELECT nextval('seq_unlogged2')"),
3, 'altered sequence nextval after restart again');
$node->safe_psql('postgres',
"INSERT INTO tab_seq_unlogged3 VALUES (DEFAULT), (DEFAULT)");
is($node->safe_psql('postgres', "SELECT * FROM tab_seq_unlogged3"),
"1\n2", 'reset sequence nextval after restart');
done_testing();

4
src/test/regress/expected/alter_table.out
View File

@ -3461,7 +3461,7 @@ ORDER BY relname;
unlogged1 | r | u
unlogged1 toast index | i | u
unlogged1 toast table | t | u
unlogged1_f1_seq | S | p
unlogged1_f1_seq | S | u
unlogged1_pkey | i | u
(5 rows)
@ -3528,7 +3528,7 @@ ORDER BY relname;
logged1 | r | u
logged1 toast index | i | u
logged1 toast table | t | u
logged1_f1_seq | S | p
logged1_f1_seq | S | u
logged1_pkey | i | u
(5 rows)

20
src/test/regress/expected/sequence.out
View File

@ -2,8 +2,6 @@
-- CREATE SEQUENCE
--
-- various error cases
CREATE UNLOGGED SEQUENCE sequence_testx;
ERROR: unlogged sequences are not supported
CREATE SEQUENCE sequence_testx INCREMENT BY 0;
ERROR: INCREMENT must not be zero
CREATE SEQUENCE sequence_testx INCREMENT BY -1 MINVALUE 20;
@ -600,6 +598,24 @@ DROP SEQUENCE seq2;
-- should fail
SELECT lastval();
ERROR: lastval is not yet defined in this session
-- unlogged sequences
-- (more tests in src/test/recovery/)
CREATE UNLOGGED SEQUENCE sequence_test_unlogged;
ALTER SEQUENCE sequence_test_unlogged SET LOGGED;
\d sequence_test_unlogged
Sequence "public.sequence_test_unlogged"
Type | Start | Minimum | Maximum | Increment | Cycles? | Cache
--------+-------+---------+---------------------+-----------+---------+-------
bigint | 1 | 1 | 9223372036854775807 | 1 | no | 1
ALTER SEQUENCE sequence_test_unlogged SET UNLOGGED;
\d sequence_test_unlogged
Unlogged sequence "public.sequence_test_unlogged"
Type | Start | Minimum | Maximum | Increment | Cycles? | Cache
--------+-------+---------+---------------------+-----------+---------+-------
bigint | 1 | 1 | 9223372036854775807 | 1 | no | 1
DROP SEQUENCE sequence_test_unlogged;
-- Test sequences in read-only transactions
CREATE TEMPORARY SEQUENCE sequence_test_temp1;
START TRANSACTION READ ONLY;

10
src/test/regress/sql/sequence.sql
View File

@ -3,7 +3,6 @@
--
-- various error cases
CREATE UNLOGGED SEQUENCE sequence_testx;
CREATE SEQUENCE sequence_testx INCREMENT BY 0;
CREATE SEQUENCE sequence_testx INCREMENT BY -1 MINVALUE 20;
CREATE SEQUENCE sequence_testx INCREMENT BY 1 MAXVALUE -20;
@ -272,6 +271,15 @@ DROP SEQUENCE seq2;
-- should fail
SELECT lastval();
-- unlogged sequences
-- (more tests in src/test/recovery/)
CREATE UNLOGGED SEQUENCE sequence_test_unlogged;
ALTER SEQUENCE sequence_test_unlogged SET LOGGED;
\d sequence_test_unlogged
ALTER SEQUENCE sequence_test_unlogged SET UNLOGGED;
\d sequence_test_unlogged
DROP SEQUENCE sequence_test_unlogged;
-- Test sequences in read-only transactions
CREATE TEMPORARY SEQUENCE sequence_test_temp1;
START TRANSACTION READ ONLY;