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Overview
Comment:Incremental progress on btree module documentation.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 42037c5bc7487b35b08a63f4c6fc925f81df10fc
User & Date: dan 2009-05-29 12:10:16
Context
2009-05-29
12:12
Add hlr50000.txt. check-in: 208f3f4f7c user: dan tags: trunk
12:10
Incremental progress on btree module documentation. check-in: 42037c5bc7 user: dan tags: trunk
2009-05-28
11:53
Add a skeleton and some notes for btree module documentation. check-in: 209bab6a3d user: dan tags: trunk
Changes
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<title>SQLite B-Tree Module</title>
<tcl>

hd_keywords {btree design}
source [file join $::DOC pages fancyformat.tcl]






















fancyformat_document "SQLite B-Tree Module" hlr50000.txt {

  [h1 "Document Overview"]

  [h2 "Scope and Purpose"]

  <ul>
................................................................................
    the interfaces and sub-systems described in this document are not stable.
    They may be changed in any way with each new SQLite release. Any 
    external software development that uses these interfaces must be prepared
    to adapt to interface refactoring without notice.

  [h2 "Document and Requirements Organization"]








  [h2 "Glossary"]
























  [h1 "Module Requirements"]

  <p>
    The SQLite B-Tree module, the software module described by this document,
    is designed to query and modify a database stored using the database image
    format described in <cite>ref_file_format</cite>. Database images may
    exist only in volatile main-memory (in-memory databases), or may be stored 
    persistently within the file-system. Or, a database image may be stored

    primarily in main-memory with the file-system used as secondary storage if
    the database image grows too large.





  <p><i>
    One-to-many connections to each database. Need a term for an in-memory cache (struct BtShared).
  </i>





















  <p><i>
    Roughly what is encapsulated by the module.
  </i>

    [h2 "Functional Requirements"]

    <p>
      This section contains requirements describing the functionality required 
      from the B-Tree module.

    [h3 "Opening and Closing Connections"]

  <ul>
    <li> Open connection.









    <li> Close connection.
  </ul>

      [fancyformat_import_requirement H50010]


    [h3 "New Database Image Configuration"]
  <ul>
    <li> Set/get page-size.
    <li> Set/get auto-vacuum capable.
  </ul>










    [h3 "Transaction and Savepoint Functions"]
  <ul>
    <li> Begin transaction.
    <li> CommitPhaseOne()/CommitPhaseTwo().
    <li> Rollback transaction.
    <li> Query for transaction state (no-transaction, readonly, read-write).
................................................................................
  </ul>

    [h3 "Reading From the Database Image"]
  <ul>
    <li> Open b-tree cursor.
    <li> Close b-tree cursor.
    <li> Seek cursor (and all of its variants).

    <li> Retrieve current key/data pointed to by cursor.
    <li> Read selected database header fields.
  </ul>

    [h3 "Writing to the Database Image"]
  <ul>
    <li> Create new b-tree structure.
................................................................................
    <li> Clear b-tree structure contents.
    <li> Incremental vacuum step.
    <li> Write selected database header fields.
    <li> Delete entry pointed to by cursor.
    <li> Insert new entry into b-tree.
  </ul>

    [h3 "Backup API Requirements"]
  <ul>
    <li> Callbacks for backup module.
    <li> Page read/write APIs for backup module.
  </ul>

    [h3 "Configuration Requirements"]

................................................................................
  <ul>
    <li> Mutexes/thread-safety features.
    <li> Lock on schema memory object.
    <li> Locks on b-tree tables.
    <li> "Unlock notify" feature.
  </ul>




  [h2 "Other Requirements"]

    [h3 "Caching and Memory Management Requirements"]
  <ul>
    <li> Memory allocation related features (pcache, scratch memory, other...).
    <li> Default pcache implementation (sqlite3_release_memory()).
    <li> Schema memory object allocation (destructor registration).
................................................................................
          <br> * During sqlite3BtreeOpen(), to find the VFS to use,
          <br> * Accessing the SQLITE_SharedCache flag (for setting it),
          <br> * To check the same B-Tree is not attached more than once in shared-cache mode,
          <br> * To link the B-Tree into the pointer-order list of shared-cache b-trees used by the same handle (used for mutexes).
          <br> * To determine if an in-memory sub-journal should be used.
          <br> * To know how many savepoints are open in BtreeBeginTrans().
          <br> * Many, many times to assert() that the db mutex is held when the b-tree layer is accessed..



















































































































  [h1 "Module Implementation"]

  [h2 "Database Image Traversal and Manipulation"]

     <p class=todo>
       This section should describe exactly how bits and bytes are shifted






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<title>SQLite B-Tree Module</title>
<tcl>

hd_keywords {btree design}
source [file join $::DOC pages fancyformat.tcl]

set fd [open [file join $SRC src btree.h]]
set btree_h [read $fd]
close $fd

proc btree_api_defn {args} {

  foreach api $args {

    set re_head {\n[^\n]*}
    if { [string match BTREE* $api] } {
      set re_tail {[^\n]*\n}
    } else {
      set re_tail {[^;]*;}
    }

    regexp $re_head$api$re_tail $::btree_h api_defn
    lappend ret [string trim $api_defn]
  }
  return "<pre class=api>[join $ret "\n"]</pre>"
}

fancyformat_document "SQLite B-Tree Module" hlr50000.txt {

  [h1 "Document Overview"]

  [h2 "Scope and Purpose"]

  <ul>
................................................................................
    the interfaces and sub-systems described in this document are not stable.
    They may be changed in any way with each new SQLite release. Any 
    external software development that uses these interfaces must be prepared
    to adapt to interface refactoring without notice.

  [h2 "Document and Requirements Organization"]

     [Table]
        [Tr] <th> Requirement ids <th> Contents
        [Tr] <td> H50**** <td> Requirement statements specifying the functionality required of the B-Tree module.
        [Tr] <td> H51**** <td> Requirement statements specifying the API provided by the B-Tree module.
        [Tr] <td>         <td> Requirement statements specifying some details of the internal workings of the B-Tree module.
      </table>

  [h2 "Glossary"]

    <table id=glossary>
      [Glossary "B-Tree Database Connection" {
        A B-Tree database connection is a single client connection to an in-memory 
        page cache, through which a single temporary or persistent database may
        be accessed. This term is used throughout this document to avoid confusing
	such connections with SQL level SQLite client connections, which are
        sometime simply termed "database connections".
      }]
      [Glossary "Lazy-write cache" {
      }]
      [Glossary "Page cache" {
      }]
      [Glossary "Persistent database" {
      }]
      [Glossary "Read-through cache" {
      }]
      [Glossary "Shared-cache mode" {
      }]
      [Glossary "Temporary database" {
      }]
    </table>
   

  [h1 "Module Requirements"]

  <p>
    The SQLite B-Tree module, the software module described by this document,
    is designed to query and modify a database stored using the database image
    format described in <cite>ref_file_format</cite>. Database images may
    exist only in volatile main-memory (in-memory databases), or may be stored 
    persistently within the file-system (also described in
    <cite>ref_file_format</cite>). Or, a database image may be stored primarily
    in main-memory with the file-system used as secondary storage if the
    database image grows too large. Database images stored only in main-memory,
    and those stored primarily in main-memory with the file-system used only to
    provide secondary storage space are known collectively as temporary
    databases. Database images stored persistently in the file-system are termed
    persistent databases.

  <p>


    This module implements an in-memory page cache to manage database image
    content. The size of the pages managed by the cache are the same as the
    page-size of the database image. When operating on a persistent database, 
    the cache operates as a read-through, lazy-write cache. When committing a 
    database transaction, the user explicitly directs the cache to flush all 
    dirty pages through to persistent storage. A single in-memory page cache 
    used to access the content of a persistent database may support multiple
    logical client connections. <span class=todo>Some brief explanation of what
    this means. And maybe a pointer to the "Multi-User Database Requirements"
    section.</span>

  <p>
    When operating on a temporary database, there may only be one client for
    each page cache. Depending on the SQLite configuration, either the database
    or journal file, or both, may be omitted from the system.

      [Figure btreemodule_overview.svg figure_overview "Role of Page Cache"]

  <p>
    Figure <cite>figure_overview</cite> depicts...

  <p><i>
    Roughly what is encapsulated by the module.
  </i>

    [h2 "Functional Requirements"]

    <p>
      This section contains requirements describing the functionality required 
      from the B-Tree module.

    [h3 "Opening and Closing Connections"]
  
    <p>
      The B-Tree module provides an interface to open new b-tree database connections.

      [fancyformat_import_requirement H50010]
      [fancyformat_import_requirement H50020]
      [fancyformat_import_requirement H50030]
      [fancyformat_import_requirement H50040]
      [fancyformat_import_requirement H50050]

    <p>
      The B-Tree module also provides an interface to close existing b-tree database 
      connections.


      [fancyformat_import_requirement H50060]
      [fancyformat_import_requirement H50070]

    [h3 "New Database Image Configuration"]





    <p>
      The following requirements describe database configuration options that
      are only applicable to new database images. For the purposes of the
      following requirements, a "new database image" is defined as one that is
      zero pages in size.

      [fancyformat_import_requirement H50080]
      [fancyformat_import_requirement H50090]

    [h3 "Transaction and Savepoint Functions"]
  <ul>
    <li> Begin transaction.
    <li> CommitPhaseOne()/CommitPhaseTwo().
    <li> Rollback transaction.
    <li> Query for transaction state (no-transaction, readonly, read-write).
................................................................................
  </ul>

    [h3 "Reading From the Database Image"]
  <ul>
    <li> Open b-tree cursor.
    <li> Close b-tree cursor.
    <li> Seek cursor (and all of its variants).
    <li> Next/Prev cursor operations.
    <li> Retrieve current key/data pointed to by cursor.
    <li> Read selected database header fields.
  </ul>

    [h3 "Writing to the Database Image"]
  <ul>
    <li> Create new b-tree structure.
................................................................................
    <li> Clear b-tree structure contents.
    <li> Incremental vacuum step.
    <li> Write selected database header fields.
    <li> Delete entry pointed to by cursor.
    <li> Insert new entry into b-tree.
  </ul>

    [h3 "Backup/Vacuum API Requirements"]
  <ul>
    <li> Callbacks for backup module.
    <li> Page read/write APIs for backup module.
  </ul>

    [h3 "Configuration Requirements"]

................................................................................
  <ul>
    <li> Mutexes/thread-safety features.
    <li> Lock on schema memory object.
    <li> Locks on b-tree tables.
    <li> "Unlock notify" feature.
  </ul>

    <p class=todo>
      The b-tree module preventing deadlock (by always grabbing mutexes in order of BtShared pointer) should be required here.

  [h2 "Other Requirements"]

    [h3 "Caching and Memory Management Requirements"]
  <ul>
    <li> Memory allocation related features (pcache, scratch memory, other...).
    <li> Default pcache implementation (sqlite3_release_memory()).
    <li> Schema memory object allocation (destructor registration).
................................................................................
          <br> * During sqlite3BtreeOpen(), to find the VFS to use,
          <br> * Accessing the SQLITE_SharedCache flag (for setting it),
          <br> * To check the same B-Tree is not attached more than once in shared-cache mode,
          <br> * To link the B-Tree into the pointer-order list of shared-cache b-trees used by the same handle (used for mutexes).
          <br> * To determine if an in-memory sub-journal should be used.
          <br> * To know how many savepoints are open in BtreeBeginTrans().
          <br> * Many, many times to assert() that the db mutex is held when the b-tree layer is accessed..


    [h2 "Opening and Closing Connections"]

    <p>
      The following two functions are used to open and close B-Tree database connections, respectively.

      [btree_api_defn Btree]

      [btree_api_defn sqlite3BtreeOpen sqlite3BtreeClose]

    <p>
      Valid values for the <i>flags</i> argument to the
      <i>sqlite3BtreeOpen()</i> function consist of the bitwise OR of zero or
      more of the following symbols.

      [btree_api_defn BTREE_OMIT_JOURNAL BTREE_NO_READLOCK]

    [h2 "Database Image Configuration"]

      <p class=todo>
	This category doesn't work all that well. These APIs are used for other
        things too (i.e. switching to incremental-vacuum mode).

      [btree_api_defn BTREE_AUTOVACUUM_NONE BTREE_AUTOVACUUM_FULL BTREE_AUTOVACUUM_INCR]
      [btree_api_defn sqlite3BtreeSetAutoVacuum sqlite3BtreeSetPageSize]

    <p>
      Queries:

      [btree_api_defn sqlite3BtreeGetPageSize]
      [btree_api_defn sqlite3BtreeGetReserve]
      [btree_api_defn sqlite3BtreeGetAutoVacuum]

    [h2 "Connection Configuration"]

      [btree_api_defn sqlite3BtreeSetCacheSize sqlite3BtreeSetSafetyLevel sqlite3BtreeMaxPageCount ]

    <p>
      And functions to query the current configuration:

      [btree_api_defn sqlite3BtreeSyncDisabled]

    [h2 "Query Interfaces"]

      [btree_api_defn sqlite3BtreeGetFilename sqlite3BtreeGetJournalname]

    [h2 "Mutex Functions"]

<pre class=api>struct BtreeMutexArray {
  int nMutex;
  Btree *aBtree\[SQLITE_MAX_ATTACHED+1\];
};</pre>

      [btree_api_defn sqlite3BtreeEnter sqlite3BtreeEnterAll sqlite3BtreeLeave sqlite3BtreeEnterCursor sqlite3BtreeLeaveCursor sqlite3BtreeLeaveAll sqlite3BtreeMutexArrayEnter sqlite3BtreeMutexArrayLeave sqlite3BtreeMutexArrayInsert]

    [h2 "Reading and Traversing the Database Image"]

      [btree_api_defn BtCursor]

      [btree_api_defn sqlite3BtreeCursor sqlite3BtreeCursorSize sqlite3BtreeCloseCursor sqlite3BtreeClearCursor]

      [btree_api_defn sqlite3BtreeMoveto sqlite3BtreeMovetoUnpacked]

      [btree_api_defn sqlite3BtreeFirst sqlite3BtreeLast sqlite3BtreeNext sqlite3BtreePrevious sqlite3BtreeEof]

      [btree_api_defn sqlite3BtreeKeySize sqlite3BtreeKey sqlite3BtreeKeyFetch sqlite3BtreeDataFetch sqlite3BtreeDataSize sqlite3BtreeData]

      [btree_api_defn sqlite3BtreeCount]

      [btree_api_defn sqlite3BtreeGetMeta]

    [h2 "Modifying the Database Image"]

      [btree_api_defn sqlite3BtreeCreateTable]

      [btree_api_defn BTREE_INTKEY BTREE_ZERODATA BTREE_LEAFDATA]

      [btree_api_defn sqlite3BtreeDropTable sqlite3BtreeClearTable sqlite3BtreeUpdateMeta]

      [btree_api_defn sqlite3BtreeDelete sqlite3BtreeInsert sqlite3BtreeCursorHasMoved sqlite3BtreePutData]

      [btree_api_defn sqlite3BtreeIncrVacuum]

    [h2 "Transaction and Savepoint API"]

      [btree_api_defn sqlite3BtreeBeginTrans sqlite3BtreeCommitPhaseOne sqlite3BtreeCommitPhaseTwo sqlite3BtreeCommit sqlite3BtreeRollback]

      [btree_api_defn sqlite3BtreeBeginStmt sqlite3BtreeSavepoint]

      [btree_api_defn sqlite3BtreeIsInTrans sqlite3BtreeIsInReadTrans sqlite3BtreeIsInBackup]

    [h2 "What do these do?"]

      [btree_api_defn sqlite3BtreeFlags]

      <p class=todo>
        Where do the following go?

      [btree_api_defn sqlite3BtreeIntegrityCheck sqlite3BtreePager]

      [btree_api_defn sqlite3BtreeSchema sqlite3BtreeSchemaLocked sqlite3BtreeLockTable sqlite3BtreeTripAllCursors]

      <p class=todo>
        I know what the following do, but is this mechanism ever used? Or has it been superceded by other tricks in OP_NewRowid?

      [btree_api_defn sqlite3BtreeSetCachedRowid sqlite3BtreeGetCachedRowid sqlite3BtreeCopyFile]

      <p class=todo>
        Should move to btreeInt.h

      [btree_api_defn BtShared]



  [h1 "Module Implementation"]

  [h2 "Database Image Traversal and Manipulation"]

     <p class=todo>
       This section should describe exactly how bits and bytes are shifted

Changes to pages/fancyformat.tcl. 

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proc h2 {args} {uplevel H 2 $args}
proc h3 {args} {uplevel H 3 $args}
proc h4 {args} {uplevel H 4 $args}

proc Figure {zImage zName zCaption} {
  incr ::SectionNumbers(fig)
  set ::References($zName) [list $::SectionNumbers(fig) $zCaption]







  subst {
      <center>
      <a name="$zName"></a>
      <img src="images/fileformat/$zImage">
      <p><i>Figure $::SectionNumbers(fig) - $zCaption</i>
      </center>
  }
}

proc sort_by_length {lhs rhs} {
  return [expr [string length $lhs] - [string length $rhs]]








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proc h2 {args} {uplevel H 2 $args}
proc h3 {args} {uplevel H 3 $args}
proc h4 {args} {uplevel H 4 $args}

proc Figure {zImage zName zCaption} {
  incr ::SectionNumbers(fig)
  set ::References($zName) [list $::SectionNumbers(fig) $zCaption]

  if {[regexp {.*svg} $zImage ]} {
    set tag "<object data=\"images/$zImage\" style=\"overflow:hidden\"></object>"
  } else {
    set tag "<img src=\"images/fileformat/$zImage\">"
  }

  subst {
      <center>
      <a name="$zName"></a>
      $tag
      <p><i>Figure $::SectionNumbers(fig) - $zCaption</i>
      </center>
  }
}

proc sort_by_length {lhs rhs} {
  return [expr [string length $lhs] - [string length $rhs]]

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