greenplumn gp_fastsequence 源码
greenplumn gp_fastsequence 代码
文件路径：/src/include/catalog/gp_fastsequence.h
/*-------------------------------------------------------------------------
*
* gp_fastsequence.h
* a table maintaining a light-weight fast sequence number for a unique
* object.
*
* Portions Copyright (c) 2009-2011, Greenplum Inc.
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/catalog/gp_fastsequence.h
*
*-------------------------------------------------------------------------
*/
#ifndef GP_FASTSEQUENCE_H
#define GP_FASTSEQUENCE_H
#include "catalog/genbki.h"
#include "catalog/gp_fastsequence_d.h"
/*
* gp_fastsequence definition
*/
CATALOG(gp_fastsequence,5043,FastSequenceRelationId)
{
Oid objid; /* object oid */
int8 objmod; /* object modifier */
int8 last_sequence; /* the last sequence number used by the object */
} FormData_gp_fastsequence;
/* GPDB added foreign key definitions for gpcheckcat. */
FOREIGN_KEY(objid REFERENCES pg_class(oid));
/* ----------------
* Form_gp_fastsequence corresponds to a pointer to a tuple with
* the format of gp_fastsequence relation.
* ----------------
*/
typedef FormData_gp_fastsequence *Form_gp_fastsequence;
#define NUM_FAST_SEQUENCES 100
extern void InsertInitialFastSequenceEntries(Oid objid);
/*
* GetFastSequences
*
* Get a list of consecutive sequence numbers. The starting sequence
* number is the current stored value in the table plus 1.
*
* If there is not such an entry for objid in the table, create
* one here and starting value as 1 is returned.
*
* The existing entry for objid in the table is updated with a new
* lastsequence value.
*/
extern int64 GetFastSequences(Oid objid, int64 objmod, int64 numSequences);
extern int64 ReadLastSequence(Oid objid, int64 objmod);
/*
* RemoveFastSequenceEntry
*
* Remove all entries associated with the given object id.
*
* If the given objid is an invalid OID, this function simply
* returns.
*
* If the given valid objid does not have an entry in
* gp_fastsequence, this function errors out.
*/
extern void RemoveFastSequenceEntry(Oid objid);
#endif
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