База данных / IS_to_STUD / Soft / 2.1.0.17798-Final / Firebird-2.1.0.17798-0_Win32 / doc / sql.extensions / README.isc_info_xxx

New information items

Author:
Vlad Horsun <hvlad at users.sourceforge.net>

New items for isc_database_info

1. isc_info_active_tran_count :
return number of currently active transactions

2. isc_info_creation_date :
return date and time when database was created
To decode call isc_vax_integer twice to extract (first) date
and (second) time portions of ISC_TIMESTAMP. Then use
isc_decode_timestamp as usual


New items for isc_transaction_info:

1. isc_info_tra_oldest_interesting :
return number of oldest interesting transaction when current
transaction started. For snapshot transactions this is also the
number of oldest transaction in the private TIP copy

2. isc_info_tra_oldest_active
for read-committed transaction return number of current transaction
for other transactions return number of oldest active transaction
when current transaction started

3. isc_info_tra_oldest_snapshot
return minimum number of tra_oldest_active of all active transactions
when current transaction started.
This value is used as garbage collection threshold

4. isc_info_tra_isolation
return transaction isolation mode of current transaction.
format of returned clumplets is following:

isc_info_tra_isolation,
1, isc_info_tra_consistency | isc_info_tra_concurrency
|
2, isc_info_tra_read_committed,
isc_info_tra_no_rec_version | isc_info_tra_rec_version

i.e. for read committed transactions returned 2 items while for
other transactions returned 1 item

5. isc_info_tra_access
return read-write access mode of current transaction.
format of returned clumplets is following:

isc_info_tra_access, 1, isc_info_tra_readonly | isc_info_tra_readwrite

6. isc_info_tra_lock_timeout
return lock timeout of current transaction