1997-04-02 05:23:38 +02:00
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/*-------------------------------------------------------------------------
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*
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1999-02-14 00:22:53 +01:00
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* sequence.h
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1997-09-07 07:04:48 +02:00
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* prototypes for sequence.c.
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1997-04-02 05:23:38 +02:00
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*
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2014-01-07 22:05:30 +01:00
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* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
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2001-08-16 22:38:56 +02:00
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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2010-09-20 22:08:53 +02:00
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* src/include/commands/sequence.h
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1997-04-02 05:23:38 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SEQUENCE_H
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#define SEQUENCE_H
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2014-11-06 12:52:08 +01:00
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#include "access/xlogrecord.h"
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2011-09-09 19:23:41 +02:00
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#include "fmgr.h"
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2014-11-06 12:52:08 +01:00
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#include "lib/stringinfo.h"
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2011-09-04 07:13:16 +02:00
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#include "nodes/parsenodes.h"
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#include "storage/relfilenode.h"
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2003-11-09 22:30:38 +01:00
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2000-11-30 02:47:33 +01:00
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typedef struct FormData_pg_sequence
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{
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NameData sequence_name;
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2001-08-16 22:38:56 +02:00
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int64 last_value;
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2008-05-17 01:36:05 +02:00
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int64 start_value;
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2001-08-16 22:38:56 +02:00
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int64 increment_by;
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int64 max_value;
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int64 min_value;
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int64 cache_value;
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int64 log_cnt;
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bool is_cycled;
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bool is_called;
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2000-11-30 02:47:33 +01:00
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} FormData_pg_sequence;
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typedef FormData_pg_sequence *Form_pg_sequence;
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1997-11-26 02:14:33 +01:00
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1997-09-07 07:04:48 +02:00
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/*
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2000-06-11 22:08:01 +02:00
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* Columns of a sequence relation
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1997-04-02 05:23:38 +02:00
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*/
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1997-09-07 07:04:48 +02:00
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#define SEQ_COL_NAME 1
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#define SEQ_COL_LASTVAL 2
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2008-05-17 01:36:05 +02:00
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#define SEQ_COL_STARTVAL 3
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#define SEQ_COL_INCBY 4
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#define SEQ_COL_MAXVALUE 5
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#define SEQ_COL_MINVALUE 6
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#define SEQ_COL_CACHE 7
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#define SEQ_COL_LOG 8
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#define SEQ_COL_CYCLE 9
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#define SEQ_COL_CALLED 10
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1997-04-02 05:23:38 +02:00
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1997-09-07 07:04:48 +02:00
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#define SEQ_COL_FIRSTCOL SEQ_COL_NAME
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#define SEQ_COL_LASTCOL SEQ_COL_CALLED
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1997-04-02 05:23:38 +02:00
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2000-11-30 02:47:33 +01:00
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/* XLOG stuff */
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2001-03-22 05:01:46 +01:00
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#define XLOG_SEQ_LOG 0x00
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2000-11-30 02:47:33 +01:00
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typedef struct xl_seq_rec
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{
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2001-03-22 05:01:46 +01:00
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RelFileNode node;
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2000-12-28 14:00:29 +01:00
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/* SEQUENCE TUPLE DATA FOLLOWS AT THE END */
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2000-11-30 02:47:33 +01:00
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} xl_seq_rec;
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2000-06-11 22:08:01 +02:00
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extern Datum nextval(PG_FUNCTION_ARGS);
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2005-10-03 01:50:16 +02:00
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extern Datum nextval_oid(PG_FUNCTION_ARGS);
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extern Datum currval_oid(PG_FUNCTION_ARGS);
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extern Datum setval_oid(PG_FUNCTION_ARGS);
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extern Datum setval3_oid(PG_FUNCTION_ARGS);
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2005-06-07 09:08:35 +02:00
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extern Datum lastval(PG_FUNCTION_ARGS);
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2000-06-11 22:08:01 +02:00
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2011-01-02 14:08:08 +01:00
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extern Datum pg_sequence_parameters(PG_FUNCTION_ARGS);
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2013-05-29 22:58:43 +02:00
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extern Oid DefineSequence(CreateSeqStmt *stmt);
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extern Oid AlterSequence(AlterSeqStmt *stmt);
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Make TRUNCATE ... RESTART IDENTITY restart sequences transactionally.
In the previous coding, we simply issued ALTER SEQUENCE RESTART commands,
which do not roll back on error. This meant that an error between
truncating and committing left the sequences out of sync with the table
contents, with potentially bad consequences as were noted in a Warning on
the TRUNCATE man page.
To fix, create a new storage file (relfilenode) for a sequence that is to
be reset due to RESTART IDENTITY. If the transaction aborts, we'll
automatically revert to the old storage file. This acts just like a
rewriting ALTER TABLE operation. A penalty is that we have to take
exclusive lock on the sequence, but since we've already got exclusive lock
on its owning table, that seems unlikely to be much of a problem.
The interaction of this with usual nontransactional behaviors of sequence
operations is a bit weird, but it's hard to see what would be completely
consistent. Our choice is to discard cached-but-unissued sequence values
both when the RESTART is executed, and at rollback if any; but to not touch
the currval() state either time.
In passing, move the sequence reset operations to happen before not after
any AFTER TRUNCATE triggers are fired. The previous ordering was not
logically sensible, but was forced by the need to minimize inconsistency
if the triggers caused an error. Transactional rollback is a much better
solution to that.
Patch by Steve Singer, rather heavily adjusted by me.
2010-11-17 22:42:18 +01:00
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extern void ResetSequence(Oid seq_relid);
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2013-10-03 22:17:18 +02:00
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extern void ResetSequenceCaches(void);
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1997-09-07 07:04:48 +02:00
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2000-11-30 02:47:33 +01:00
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extern void seq_redo(XLogRecPtr lsn, XLogRecord *rptr);
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2014-06-14 09:46:48 +02:00
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extern void seq_desc(StringInfo buf, XLogRecord *rptr);
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2014-09-19 15:17:12 +02:00
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extern const char *seq_identify(uint8 info);
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2001-10-28 07:26:15 +01:00
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2001-11-05 18:46:40 +01:00
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#endif /* SEQUENCE_H */
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