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Diffstat (limited to 'lib/ntdb/doc/design.lyx')
| -rw-r--r-- | lib/ntdb/doc/design.lyx | 72 |
1 files changed, 55 insertions, 17 deletions
diff --git a/lib/ntdb/doc/design.lyx b/lib/ntdb/doc/design.lyx index 0a1d6a14bc..5a10ee35c3 100644 --- a/lib/ntdb/doc/design.lyx +++ b/lib/ntdb/doc/design.lyx @@ -1,48 +1,66 @@ -#LyX 1.6.7 created this file. For more info see http://www.lyx.org/ -\lyxformat 345 +#LyX 2.0 created this file. For more info see http://www.lyx.org/ +\lyxformat 413 \begin_document \begin_header \textclass article \use_default_options true +\maintain_unincluded_children false \language english +\language_package default \inputencoding auto +\fontencoding global \font_roman default \font_sans default \font_typewriter default \font_default_family default +\use_non_tex_fonts false \font_sc false \font_osf false \font_sf_scale 100 \font_tt_scale 100 \graphics default +\default_output_format default +\output_sync 0 +\bibtex_command default +\index_command default \paperfontsize default \use_hyperref false \papersize default \use_geometry false \use_amsmath 1 \use_esint 1 +\use_mhchem 1 +\use_mathdots 1 \cite_engine basic \use_bibtopic false +\use_indices false \paperorientation portrait +\suppress_date false +\use_refstyle 0 +\index Index +\shortcut idx +\color #008000 +\end_index \secnumdepth 3 \tocdepth 3 \paragraph_separation indent -\defskip medskip +\paragraph_indentation default \quotes_language english \papercolumns 1 \papersides 1 \paperpagestyle default \tracking_changes true \output_changes true -\author "" -\author "" +\html_math_output 0 +\html_css_as_file 0 +\html_be_strict false \end_header \begin_body \begin_layout Title -TDB2: A Redesigning The Trivial DataBase +NTDB: Redesigning The Trivial DataBase \end_layout \begin_layout Author @@ -50,7 +68,7 @@ Rusty Russell, IBM Corporation \end_layout \begin_layout Date -17-March-2011 +19 June 2012 \end_layout \begin_layout Abstract @@ -87,7 +105,7 @@ The wider variety and greater demands of TDB-using code has lead to some \begin_layout Standard \begin_inset Tabular <lyxtabular version="3" rows="12" columns="3"> -<features> +<features tabularvalignment="middle"> <column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top" width="0"> @@ -453,6 +471,20 @@ This review is an attempt to catalog and address all the known issues with second system syndrome in rewriting a successful project like this. \end_layout +\begin_layout Standard +Note: the final decision was to make ntdb a separate library, with a separarate + 'ntdb' namespace so both can potentially be linked together. + This document still refers to +\begin_inset Quotes eld +\end_inset + +tdb +\begin_inset Quotes erd +\end_inset + + everywhere, for simplicity. +\end_layout + \begin_layout Section API Issues \end_layout @@ -960,7 +992,6 @@ There are several issues with this approach. have under some circumstances. I don't believe this is currently the case, but it constrains the implementatio n. - \end_layout \begin_layout Subsubsection @@ -1025,7 +1056,7 @@ Status \end_layout \begin_layout Standard -Incomplete. +Complete. \end_layout \begin_layout Subsection @@ -1114,7 +1145,7 @@ Status \end_layout \begin_layout Standard -Incomplete. +Complete. \end_layout \begin_layout Subsection @@ -1291,6 +1322,7 @@ Status \begin_layout Standard Complete. + An open hook is provided to replicate this functionality if required. \end_layout \begin_layout Subsection @@ -1433,7 +1465,7 @@ Status \end_layout \begin_layout Standard -Deferred. +Complete, using the NTDB_ATTRIBUTE_ALLOCATOR attribute. \end_layout \begin_layout Section @@ -1661,7 +1693,12 @@ Status \end_layout \begin_layout Standard -Complete. +Ignore. + Scaling the hash automatically proved inefficient at small hash sizes; + we default to a 8192-element hash (changable via NTDB_ATTRIBUTE_HASHSIZE), + and when buckets clash we expand to an array of hash entries. + This scales slightly better than the tdb chain (due to the 8 top bits containin +g extra hash). \end_layout \begin_layout Subsection @@ -1738,7 +1775,6 @@ If it's more than max_dead, bulk free all the dead ones (similar to steps \begin_layout Enumerate Simply mark this record as dead and return. - \end_layout \end_deeper @@ -1920,7 +1956,6 @@ reference "sub:Records-Incur-A" \end_inset . - \end_layout \begin_layout Standard @@ -2357,7 +2392,11 @@ TDB Does Not Have Snapshot Support \end_layout \begin_layout Subsubsection -Proposed SolutionNone. +Proposed Solution +\end_layout + +\begin_layout Standard +None. At some point you say \begin_inset Quotes eld \end_inset @@ -2666,7 +2705,6 @@ name "replay-attribute" \begin_layout Standard Tridge points out that an attribute can be later added to tdb_open (see - \begin_inset CommandInset ref LatexCommand ref reference "attributes" |