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user.c

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    • Tom Lane's avatar
      60b2444c
      Add code to prevent transaction ID wraparound by enforcing a safe limit · 60b2444c
      Tom Lane authored
      in GetNewTransactionId().  Since the limit value has to be computed
      before we run any real transactions, this requires adding code to database
      startup to scan pg_database and determine the oldest datfrozenxid.
      This can conveniently be combined with the first stage of an attack on
      the problem that the 'flat file' copies of pg_shadow and pg_group are
      not properly updated during WAL recovery.  The code I've added to
      startup resides in a new file src/backend/utils/init/flatfiles.c, and
      it is responsible for rewriting the flat files as well as initializing
      the XID wraparound limit value.  This will eventually allow us to get
      rid of GetRawDatabaseInfo too, but we'll need an initdb so we can add
      a trigger to pg_database.
      60b2444c
      History
      Add code to prevent transaction ID wraparound by enforcing a safe limit
      Tom Lane authored
      in GetNewTransactionId().  Since the limit value has to be computed
      before we run any real transactions, this requires adding code to database
      startup to scan pg_database and determine the oldest datfrozenxid.
      This can conveniently be combined with the first stage of an attack on
      the problem that the 'flat file' copies of pg_shadow and pg_group are
      not properly updated during WAL recovery.  The code I've added to
      startup resides in a new file src/backend/utils/init/flatfiles.c, and
      it is responsible for rewriting the flat files as well as initializing
      the XID wraparound limit value.  This will eventually allow us to get
      rid of GetRawDatabaseInfo too, but we'll need an initdb so we can add
      a trigger to pg_database.