.I+Berkeley DB: DbMpool.trickle[P

DbMpool.trickle





import com.sleepycat.db.*;

public int trickle(int pct) throws DbException;





Description



FThe DbMpool.trickle method ensures that at least pct percent ofGthe pages in the shared memory pool are clean by writing dirty pages totheir backing files.HThe number of pages that were written to reach the correct percentage is returned.>

The purpose of the DbMpool.trickle function is to enable aImemory pool manager to ensure that a page is always available for reading6in new information without having to wait for a write.

The DbMpool.trickleHmethod throws an exception that encapsulates an errno on failure.



Errors

WIf a fatal error occurs in Berkeley DB, the DbMpool.trickle method may fail and throw a}DbRunRecoveryException, at which point all subsequent database%calls will also fail in the same way.

The DbMpool.trickle&method may fail and throw an exceptionKfor any of the errors specified for the following Berkeley DB and C library functions:DBmemp->pgin(3),DBmemp->pgout(3), abort(3), close(3),dbenv->db_paniccall(3), fcntl(3), fflush(3), fprintf(3),free(3), fstat(3), fsync(3), getenv(3), getpid(3), getuid(3), isdigit(3),>DbLog.compare,:DbLog.flush, lseek(3), malloc(3), memcmp(3), memcpy(3), memset(3),mmap(3),open(3), pread(3),pstat_getdynamic(3), pwrite(3),read(3),sigfillset(3),sigprocmask(3),stat(3), strerror(3), strlen(3), sysconf(3),time(3), unlink(3), vfprintf(3), vsnprintf(3),and write(3).

In addition, the DbMpool.trickle&method may fail and throw an exceptionencapsulating errnofor the following conditions:

B

EINVAL
An invalid flag value or parameter was specified.







Class

7DbMpool



See Also

=DbMpool.fstat,;DbMpool.statandDbMpool.trickle.
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