Can I reopen it a database DB_HASH (or DB_BTREE) with indicator DB_LOG_IN_MEMORY?

I have an environment with indicator DB_LOG_IN_MEMORY. After filling the DB_HASH (or DB_BTREE) database with some key/value pairs, I make the point of control and explicitly close handles all open. When I attach to the environment and the open database once I catch the exception to the Db::put method. Here is a small example program built with Berkeley DB 6.1.19

#include "... / db_cxx.h".

void foo()

{

DbEnv env (0);

env.set_lg_bsize (10 * 1024 * 1024);

env.set_flags (DB_TXN_NOSYNC, 1);

env.log_set_config (DB_LOG_IN_MEMORY, 1);

approx. Open ("d:\\test", DB_CREATE |) DB_INIT_LOG | DB_INIT_TXN | DB_INIT_MPOOL | DB_RECOVER | DB_PRIVATE, 0);

DB db (& env, 0);

DB. Open (nullptr, "test.bdb", nullptr, DB_HASH, DB_AUTO_COMMIT |) DB_CREATE, 0);

DbTxn * txn;

env.txn_begin (nullptr, & txn, 0);

for (int i = 0; i < 1000; ++ i)

{

DBT k;

k.SET_DATA (-i);

k.set_ulen (sizeof ((i));

k.set_flags (DB_DBT_USERMEM);

DBT v;

v.SET_DATA (-i);

v.set_ulen (sizeof ((i));

v.set_flags (DB_DBT_USERMEM);

DB.put (txn, k, & v, 0);

}

TXN-> commit (0);

env.Txn_checkpoint (0, 0, DB_FORCE);

DB. Close (0);

approx. Close (0);

}

int main (int argc, char * argv [])

{

Try

{

std::cout < < 'Attempt #1' < < std::endl;

foo();

std::cout < < 'Attempt #2' < < std::endl;

foo();

}

catch (const DbException & e)

{

std::CERR < < "DbException:" < < e.what () < < std::endl; "."

}

return 0;

}

Output:

Attempt #1

Attempt #2

BDB2506 file test.bdb has LSN 1/84854, beyond the end of the log to 1/165

BDB2507 usually caused by moving a database of databases environment

BDB2508 to another without erasing the LSNs of the database, or by the deletion of all

BDB2509 logs in a database environment

BDB4511 error: closing of the transaction with all the active transactions area

DbException: Db::put: invalid argument

What I am doing wrong? That works fine if I activate the DB_LOG_IN_MEMORY flag.

Each BDB database file keeps track of the last number (LSN) used newspaper to help recovery and fight against corruption.  Because newspapers are lost after the closure of the environment, you must call the DB_ENV-> lsn_reset() ( https://docs.oracle.com/cd/E17276_01/html/api_reference/C/envlsn_reset.html ) for each file in the database before re - open to restore the NSE the correct number.

Lauren Foutz

Tags: Database

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