diff options
Diffstat (limited to 'src/backend/access/transam/multixact.c')
| -rw-r--r-- | src/backend/access/transam/multixact.c | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c index ce84dac0c40..475f5ed8611 100644 --- a/src/backend/access/transam/multixact.c +++ b/src/backend/access/transam/multixact.c @@ -2217,28 +2217,24 @@ SetMultiXactIdLimit(MultiXactId oldest_datminmxid, Oid oldest_datoid, multiWrapLimit += FirstMultiXactId; /* - * We'll refuse to continue assigning MultiXactIds once we get within 100 - * multi of data loss. - * - * Note: This differs from the magic number used in - * SetTransactionIdLimit() since vacuum itself will never generate new - * multis. XXX actually it does, if it needs to freeze old multis. + * We'll refuse to continue assigning MultiXactIds once we get within 3M + * multi of data loss. See SetTransactionIdLimit. */ - multiStopLimit = multiWrapLimit - 100; + multiStopLimit = multiWrapLimit - 3000000; if (multiStopLimit < FirstMultiXactId) multiStopLimit -= FirstMultiXactId; /* - * We'll start complaining loudly when we get within 10M multis of the - * stop point. This is kind of arbitrary, but if you let your gas gauge - * get down to 1% of full, would you be looking for the next gas station? - * We need to be fairly liberal about this number because there are lots - * of scenarios where most transactions are done by automatic clients that - * won't pay attention to warnings. (No, we're not gonna make this + * We'll start complaining loudly when we get within 40M multis of data + * loss. This is kind of arbitrary, but if you let your gas gauge get + * down to 2% of full, would you be looking for the next gas station? We + * need to be fairly liberal about this number because there are lots of + * scenarios where most transactions are done by automatic clients that + * won't pay attention to warnings. (No, we're not gonna make this * configurable. If you know enough to configure it, you know enough to * not get in this kind of trouble in the first place.) */ - multiWarnLimit = multiStopLimit - 10000000; + multiWarnLimit = multiWrapLimit - 40000000; if (multiWarnLimit < FirstMultiXactId) multiWarnLimit -= FirstMultiXactId; |