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• branch=trunk inherited from [b2e03e19ab]
• sym-trunk inherited from [b2e03e19ab]

Changes to pages/wal.in

  396                                                                                       396  
  397  <p>^If NORMAL locking mode is in effect for the first WAL-mode database              397  <p>^If NORMAL locking mode is in effect for the first WAL-mode database
  398  access, then the shared-memory wal-index is created.  ^This means that the           398  access, then the shared-memory wal-index is created.  ^This means that the
  399  underlying VFS must support the "version 2" shared-memory.                           399  underlying VFS must support the "version 2" shared-memory.
  400  ^If the VFS does not support shared-memory methods, then the attempt to              400  ^If the VFS does not support shared-memory methods, then the attempt to
  401  open a database that is already in WAL mode, or the attempt convert a                401  open a database that is already in WAL mode, or the attempt convert a
  402  database into WAL mode, will fail.                                                   402  database into WAL mode, will fail.
  403  ^As long a connection is using a shared-memory wal-index, the locking            |   403  ^As long as exactly one connection is using a shared-memory wal-index,
  404  mode can be changed freely between NORMAL and EXCLUSIVE.  ^It is only            |   404  the locking mode can be changed freely between NORMAL and EXCLUSIVE.
  405  when the shared-memory wal-index is omitted, when the locking mode is            |   405  ^It is only when the shared-memory wal-index is omitted, when the locking
  406  EXCLUSIVE prior to the first WAL-mode database access, that the locking          |   406  mode is EXCLUSIVE prior to the first WAL-mode database access, that the
  407  mode is stuck in EXCLUSIVE.</p>                                                  |   407  locking mode is stuck in EXCLUSIVE.</p>
  408                                                                                       408  
  409  <tcl>hd_fragment bkwrds {WAL backwards compatibility}</tcl>                          409  <tcl>hd_fragment bkwrds {WAL backwards compatibility}</tcl>
  410  <h2>Backwards Compatibility</h2>                                                     410  <h2>Backwards Compatibility</h2>
  411                                                                                       411  
  412  <p>The database file format is unchanged for WAL mode.  However, the                 412  <p>The database file format is unchanged for WAL mode.  However, the
  413  WAL file and the [wal-index] are new concepts and so older versions of               413  WAL file and the [wal-index] are new concepts and so older versions of
  414  SQLite will not know                                                                 414  SQLite will not know