Firebird Database Cache Buffer Norman Dunbar, Martin Köditz Version 1.2, 28 May 2020 Table of Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. The Firebird Cache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table of Contents 1 Chapter 1. Introduction Firebird uses a page cache to hold pages in memory. It is much quicker to retrieve pages from RAM than to go out onto the disc

Der Firebird Cache-Buffer Norman Dunbar, Martin Köditz Version 1.2-de, 28. Mai 2020 Inhaltsverzeichnis 1. Einleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Der Firebird-Cache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Inhaltsverzeichnis 1 Kapitel 1. Einleitung Firebird nutzt einen Seiten-Cache (engl. page cache), um die Seiten im Speicher vorzuhalten. Diese sind deutlich schneller aus dem Arbeitsspeicher

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7. Cache Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . line options for the gfix database utility. • Shadow file handling. • Cache and buffer handling. • Transaction management. • Cache management. • Starting and stopping a database. • And much, much more buffers -co(mmit) commit transaction -ca(che) shutdown cache manager -fu(ll) validate record fragments (-v) -fo(rce_shutdown) force database

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.6. Change The Cache Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . default database cache size (in number of database pages) for the database being restored. If a database is being overwritten then this setting will overwrite the previous setting for the cache size. -C[REATE_DATABASE] 6.6. Change The Cache Size The default database cache is created when the database is created, or subsequently by using gfix. Gbak can restore a database and reset the default cache size as well. The

logb_small Log block too small at offset %ld in log file %s -239 335544691 cache_too_small Insufficient memory to allocate page buffer cache -239 335544693 log_too_small Log size too small -239 335544694 partition_too_small use Write-ahead Log -257 335544566 start_cm_for_wal WAL defined; Cache Manager must be started first -260 335544690 cache_redef Cache redefined -260 335544692 log_redef Log redefined Firebird 2.0 Error not supported -599 335544625 node_name_err A node name is not permitted in a secondary, shadow, cache or log file name -600 335544680 crrp_data_err Sort error: corruption in data structure -601 335544646

logb_small Log block too small at offset @1 in log file @2 -239 335544691 cache_too_small Insufficient memory to allocate page buffer cache -239 335544693 log_too_small Log size too small -239 335544694 partition_too_small use Write-ahead Log -257 335544566 start_cm_for_wal WAL defined; Cache Manager must be started first -260 335544690 cache_redef Cache redefined -260 335544692 log_redef Log redefined -261 335544695 not supported -599 335544625 node_name_err A node name is not permitted in a secondary, shadow, cache or log file name -600 335544680 crrp_data_err Sort error: corruption in data structure -601 335544646

relnotdef Table is not defined -239 335544691 cache_too_small Insufficient memory to allocate page buffer cache -260 335544690 cache_redef Cache redefined -281 335544637 no_stream_plan Table not supported -599 335544625 node_name_err A node name is not permitted in a secondary, shadow, cache or log file Firebird 1.5 Error Codes Updated 04/30/04 p. 8 name -600 335544680 crrp_data_err Sort bad_checksum Bad checksum -836 335544517 except Exception -837 335544518 cache_restart Restart shared cache manager -838 335544560 shutwarn Database shutdown in seconds -841

page size 4096 with one on 32768: +/- 1KB vs +/- 29KB), and increase memory consumption of the page cache. LENGTH Clause specifying the maximum size of the primary or secondary database file, in pages. will not see the effect of the change until the next time the trigger is loaded into the metadata cache. Replication Management To stop replicating a table, use the DISABLE PUBLICATION clause. To start will not see the effect of the change until the next time the trigger is loaded into the metadata cache. See also SQL Security in chapter Security. The Trigger Body The trigger body is either a PSQL

chacune avec son propre cache. Moins de ressources sont utilisées si le nombre de connexion est faible. Un seul processus serveur avec un thread pour chaque connexion. Le cache est partagé. Plus efficace l'écriture des données asynchrone – ce qui permet de garder en mémoire cache les nouvelles données ou modifications. La mémoire cache est vidée périodiquement sur le disque par le sous-système d'entrée sortie écritures forcées sur un serveur Windows. On a observé que les serveurs Windows ne vident pas le cache tant que le service Firebird n'est pas arrété. Indépendament des coupures de courant electrique, il

connec- tion, each with its own cache. Less re- source use if the number of connections is low. Single server process with a separate thread for each connection. Shared cache space. More efficient if the a database to use asynchronous data writes – whereby modified or new data are held in the memory cache for periodic flushing to disk by the operating system's I/O subsystem. The common term for this configuration on a Windows server. It has been observed that the Windows server platforms do not flush the write cache until the Firebird service is shut down. Apart from power interruptions, there is just too much that