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| -rw-r--r-- | doc/TODO | 11 | ||||
| -rw-r--r-- | doc/src/FAQ/TODO.html | 10 |
2 files changed, 14 insertions, 7 deletions
@@ -2,7 +2,7 @@ PostgreSQL TODO List ==================== Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) -Last updated: Thu Dec 1 17:12:27 EST 2005 +Last updated: Thu Dec 1 17:30:23 EST 2005 The most recent version of this document can be viewed at http://www.postgresql.org/docs/faqs.TODO.html. @@ -859,11 +859,14 @@ Cache Usage Currently indexes do not have enough tuple visibility information to allow data to be pulled from the index without also accessing - the heap. One way to allow this is to set a bit to index tuples + the heap. One way to allow this is to set a bit on index tuples to indicate if a tuple is currently visible to all transactions when the first valid heap lookup happens. This bit would have to - be cleared when a heap tuple is expired. - + be cleared when a heap tuple is expired. Another idea is to maintain + a bitmap of heap pages where all rows are visible to all backends, + and allow index lookups to reference that bitmap to avoid heap + lookups, perhaps the same bitmap we might add someday to determine + which heap pages need vacuuming. * Consider automatic caching of queries at various levels: diff --git a/doc/src/FAQ/TODO.html b/doc/src/FAQ/TODO.html index 7bb7cd28420..7e4961eaa7b 100644 --- a/doc/src/FAQ/TODO.html +++ b/doc/src/FAQ/TODO.html @@ -8,7 +8,7 @@ <body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF"> <h1><a name="section_1">PostgreSQL TODO List</a></h1> <p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/> -Last updated: Thu Dec 1 17:12:27 EST 2005 +Last updated: Thu Dec 1 17:30:23 EST 2005 </p> <p>The most recent version of this document can be viewed at<br/> <a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>. @@ -778,10 +778,14 @@ first. </li><li>Allow data to be pulled directly from indexes <p> Currently indexes do not have enough tuple visibility information to allow data to be pulled from the index without also accessing - the heap. One way to allow this is to set a bit to index tuples + the heap. One way to allow this is to set a bit on index tuples to indicate if a tuple is currently visible to all transactions when the first valid heap lookup happens. This bit would have to - be cleared when a heap tuple is expired. + be cleared when a heap tuple is expired. Another idea is to maintain + a bitmap of heap pages where all rows are visible to all backends, + and allow index lookups to reference that bitmap to avoid heap + lookups, perhaps the same bitmap we might add someday to determine + which heap pages need vacuuming. </p> </li><li>Consider automatic caching of queries at various levels: <ul> |