/*
* CatalogCacheFlushCatalog
*
* Flush all catcache entries that came from the specified system catalog.
* This is needed after VACUUM FULL/CLUSTER on the catalog, since the
* tuples very likely now have different TIDs than before. (At one point
* we also tried to force re-execution of CatalogCacheInitializeCache for
* the cache(s) on that catalog. This is a bad idea since it leads to all
* kinds of trouble if a cache flush occurs while loading cache entries.
* We now avoid the need to do it by copying cc_tupdesc out of the relcache,
* rather than relying on the relcache to keep a tupdesc for us. Of course
* this assumes the tupdesc of a cachable system table will not change...)
*/
void
CatalogCacheFlushCatalog(Oid catId)
{
CatCache *cache;
CACHE2_elog(DEBUG2, "CatalogCacheFlushCatalog called for %u", catId);
for (cache = CacheHdr->ch_caches; cache; cache = cache->cc_next)
{
/* We can ignore uninitialized caches, since they must be empty */
if (cache->cc_tupdesc == NULL)
continue;
/* Does this cache store tuples of the target catalog? */
if (cache->cc_tupdesc->attrs[0]->attrelid == catId)
{
/* Yes, so flush all its contents */
ResetCatalogCache(cache);
/* Tell inval.c to call syscache callbacks for this cache */
CallSyscacheCallbacks(cache->id, NULL);
}
}
CACHE1_elog(DEBUG2, "end of CatalogCacheFlushCatalog call");
}
/*
* ResetCatalogCaches
*
* Reset all caches when a shared cache inval event forces it
*/
void
ResetCatalogCaches(void)
{
CatCache *cache;
CACHE1_elog(DEBUG2, "ResetCatalogCaches called");
for (cache = CacheHdr->ch_caches; cache; cache = cache->cc_next)
ResetCatalogCache(cache);
CACHE1_elog(DEBUG2, "end of ResetCatalogCaches call");
}
/*
* CatalogCacheFlushCatalog
*
* Flush all catcache entries that came from the specified system catalog.
* This is needed after VACUUM FULL/CLUSTER on the catalog, since the
* tuples very likely now have different TIDs than before. (At one point
* we also tried to force re-execution of CatalogCacheInitializeCache for
* the cache(s) on that catalog. This is a bad idea since it leads to all
* kinds of trouble if a cache flush occurs while loading cache entries.
* We now avoid the need to do it by copying cc_tupdesc out of the relcache,
* rather than relying on the relcache to keep a tupdesc for us. Of course
* this assumes the tupdesc of a cachable system table will not change...)
*/
void
CatalogCacheFlushCatalog(Oid catId)
{
CatCache *cache;
CACHE2_elog(DEBUG2, "CatalogCacheFlushCatalog called for %u", catId);
for (cache = CacheHdr->ch_caches; cache; cache = cache->cc_next)
{
/* Does this cache store tuples of the target catalog? */
if (cache->cc_reloid == catId)
{
/* Yes, so flush all its contents */
ResetCatalogCache(cache);
/* Tell inval.c to call syscache callbacks for this cache */
CallSyscacheCallbacks(cache->id, 0);
}
}
CACHE1_elog(DEBUG2, "end of CatalogCacheFlushCatalog call");
}
/*
* CatalogCacheFlushRelation
*
* This is called by RelationFlushRelation() to clear out cached information
* about a relation being dropped. (This could be a DROP TABLE command,
* or a temp table being dropped at end of transaction, or a table created
* during the current transaction that is being dropped because of abort.)
* Remove all cache entries relevant to the specified relation OID.
*
* A special case occurs when relId is itself one of the cacheable system
* tables --- although those'll never be dropped, they can get flushed from
* the relcache (VACUUM causes this, for example). In that case we need
* to flush all cache entries that came from that table. (At one point we
* also tried to force re-execution of CatalogCacheInitializeCache for
* the cache(s) on that table. This is a bad idea since it leads to all
* kinds of trouble if a cache flush occurs while loading cache entries.
* We now avoid the need to do it by copying cc_tupdesc out of the relcache,
* rather than relying on the relcache to keep a tupdesc for us. Of course
* this assumes the tupdesc of a cachable system table will not change...)
*/
void
CatalogCacheFlushRelation(Oid relId)
{
CatCache *cache;
CACHE2_elog(DEBUG2, "CatalogCacheFlushRelation called for %u", relId);
for (cache = CacheHdr->ch_caches; cache; cache = cache->cc_next)
{
int i;
/* We can ignore uninitialized caches, since they must be empty */
if (cache->cc_tupdesc == NULL)
continue;
/* Does this cache store tuples of the target relation itself? */
if (cache->cc_tupdesc->attrs[0]->attrelid == relId)
{
/* Yes, so flush all its contents */
ResetCatalogCache(cache);
continue;
}
/* Does this cache store tuples associated with relations at all? */
if (cache->cc_reloidattr == 0)
continue; /* nope, leave it alone */
/* Yes, scan the tuples and remove those related to relId */
for (i = 0; i < cache->cc_nbuckets; i++)
{
Dlelem *elt,
*nextelt;
for (elt = DLGetHead(&cache->cc_bucket[i]); elt; elt = nextelt)
{
CatCTup *ct = (CatCTup *) DLE_VAL(elt);
Oid tupRelid;
nextelt = DLGetSucc(elt);
/*
* Negative entries are never considered related to a rel,
* even if the rel is part of their lookup key.
*/
if (ct->negative)
continue;
if (cache->cc_reloidattr == ObjectIdAttributeNumber)
tupRelid = HeapTupleGetOid(&ct->tuple);
else
{
bool isNull;
tupRelid =
DatumGetObjectId(fastgetattr(&ct->tuple,
cache->cc_reloidattr,
cache->cc_tupdesc,
&isNull));
Assert(!isNull);
}
if (tupRelid == relId)
{
if (ct->refcount > 0)
ct->dead = true;
else
CatCacheRemoveCTup(cache, ct);
#ifdef CATCACHE_STATS
cache->cc_invals++;
#endif
}
}
}
}
CACHE1_elog(DEBUG2, "end of CatalogCacheFlushRelation call");
}