On 2013-02-03 02:40:04 +0100, Andres Freund wrote:
> On 2013-02-01 15:09:34 -0800, Jeff Janes wrote:
> > As an aside, it does seem like log_autovacuum_min_duration=0 should
> > log whether a scan_all was done, and if so what relfrozenxid got set
> > to. But looking at where the log message is generated, I don't know
> > where to retrieve that info.
>
> What about the following, very rough and quick, patch:
-EINTR
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 5ec65ea..881d8d6 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -304,6 +304,11 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
TimestampDifferenceExceeds(starttime, endtime,
Log_autovacuum_min_duration))
{
+ double scanned_percent;
+ txid freeze_txid;
+ txid relfrozen_txid;
+ char freeze_txid_buf[80];
+ char relfrozen_txid_buf[80];
TimestampDifference(starttime, endtime, &secs, &usecs);
read_rate = 0;
@@ -315,10 +320,29 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
write_rate = (double) BLCKSZ *VacuumPageDirty / (1024 * 1024) /
(secs + usecs / 1000000.0);
}
+
+ scanned_percent = ((double) vacrelstats->scanned_pages /
+ (vacrelstats->rel_pages +
+ vacrelstats->pages_removed)) * 100;
+
+ freeze_txid = txid_from_xid(FreezeLimit);
+ relfrozen_txid = txid_from_xid(new_frozen_xid);
+
+ /*
+ * print to buffer, so we don't have to include UINT64_FORMAT in a
+ * translatable string.
+ */
+ snprintf(freeze_txid_buf, sizeof(freeze_txid_buf),
+ UINT64_FORMAT, freeze_txid);
+
+ snprintf(relfrozen_txid_buf, sizeof(relfrozen_txid_buf),
+ UINT64_FORMAT, relfrozen_txid);
+
ereport(LOG,
(errmsg("automatic vacuum of table \"%s.%s.%s\": index scans: %d\n"
- "pages: %d removed, %d remain\n"
+ "pages: %d removed, %d remain, %d (%.02f%%) scanned\n"
"tuples: %.0f removed, %.0f remain\n"
+ "full-scan: %d, freeze-limit: %s, new-frozen-xid: %s\n"
"buffer usage: %d hits, %d misses, %d dirtied\n"
"avg read rate: %.3f MB/s, avg write rate: %.3f MB/s\n"
"system usage: %s",
@@ -328,8 +352,13 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
vacrelstats->num_index_scans,
vacrelstats->pages_removed,
vacrelstats->rel_pages,
+ vacrelstats->scanned_pages,
+ scanned_percent,
vacrelstats->tuples_deleted,
vacrelstats->new_rel_tuples,
+ scan_all,
+ freeze_txid_buf,
+ scan_all ? relfrozen_txid_buf : "-",
VacuumPageHit,
VacuumPageMiss,
VacuumPageDirty,
diff --git a/src/backend/utils/adt/txid.c b/src/backend/utils/adt/txid.c
index de86756..78edec5 100644
--- a/src/backend/utils/adt/txid.c
+++ b/src/backend/utils/adt/txid.c
@@ -33,9 +33,6 @@
/* txid will be signed int8 in database, so must limit to 63 bits */
#define MAX_TXID UINT64CONST(0x7FFFFFFFFFFFFFFF)
-/* Use unsigned variant internally */
-typedef uint64 txid;
-
/* sprintf format code for uint64 */
#define TXID_FMT UINT64_FORMAT
@@ -98,11 +95,17 @@ convert_xid(TransactionId xid, const TxidEpoch *state)
if (!TransactionIdIsNormal(xid))
return (txid) xid;
- /* xid can be on either side when near wrap-around */
epoch = (uint64) state->epoch;
+ /* xid is too old to be real */
if (xid > state->last_xid &&
+ TransactionIdPrecedes(xid, state->last_xid) &&
+ epoch == 0)
+ xid = InvalidTransactionId;
+ /* xid in last epoch */
+ else if (xid > state->last_xid &&
TransactionIdPrecedes(xid, state->last_xid))
epoch--;
+ /* xid after wraparound */
else if (xid < state->last_xid &&
TransactionIdFollows(xid, state->last_xid))
epoch++;
@@ -317,6 +320,16 @@ bad_format:
* communicate with core xid machinery. All the others work on data
* returned by them.
*/
+txid
+txid_from_xid(TransactionId xid)
+{
+ txid val;
+ TxidEpoch state;
+
+ load_xid_epoch(&state);
+ val = convert_xid(xid, &state);
+ return val;
+}
/*
* txid_current() returns int8
@@ -327,9 +340,6 @@ bad_format:
Datum
txid_current(PG_FUNCTION_ARGS)
{
- txid val;
- TxidEpoch state;
-
/*
* Must prevent during recovery because if an xid is not assigned we try
* to assign one, which would fail. Programs already rely on this function
@@ -338,11 +348,7 @@ txid_current(PG_FUNCTION_ARGS)
*/
PreventCommandDuringRecovery("txid_current()");
- load_xid_epoch(&state);
-
- val = convert_xid(GetTopTransactionId(), &state);
-
- PG_RETURN_INT64(val);
+ return txid_from_xid(GetTopTransactionId());
}
/*
diff --git a/src/include/access/transam.h b/src/include/access/transam.h
index 23a41fd..5d99f4d 100644
--- a/src/include/access/transam.h
+++ b/src/include/access/transam.h
@@ -127,6 +127,13 @@ typedef struct VariableCacheData
typedef VariableCacheData *VariableCache;
+/*
+ * 64bit representation of xids which include the epoch
+ */
+typedef uint64 txid;
+txid txid_from_xid(TransactionId xid);
+
+
/* ----------------
* extern declarations
--
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