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Home -> Community -> Usenet -> c.d.o.server -> Re: Oracle Memory Configuration (newbie)
daniel,
there is a parameter file for each instance, referred to as the "init.ora" (pronounced "init dot ora"), which sets memory consumption at start up of the instance. these parameters are very important for performance. they control a part of the instance called the "system global area", or SGA. the more "stuff" one can put in memory, the faster the instance performs (some of the securities exchanges maintain the entire database in RAM - but they can afford to do it...and they cannot afford to not do it...and this is an extreme exception to the norm). however, if the oracle instance takes away memory from other processes or the OS, then swapping and thrashing may occur, which has a negative effect on system performance. thus, there is a balance. it seems that you should have about 500mb to play with.
i recommend you review the oracle manual which identifies all of the init.ora parameters. this is available at http://otn.oracle.com. there is no cost to use otn, but you do have to register.
also, i have included an "init.ora" parameter file below from a (very tuned) oracle7.3.4 on-line transaction processing system which uses Java interfaces. if you are on oracle8i, some of these parameters are obsolete.
also, keep in mind that the oracle instance identified (SID) is usually part of the init file name. for example, if your SID is "prod", then the init file name would most likely be initprod.ora.
steve long
"The world's best technology strategist." (TM)
control_files = (E:\ORAdata1\prod\Ctl1prod.ora,
F:\oradata2\prod\Ctl2prod.ora)
rollback_segments = (R01,R02,R03,R04,R05, R06, R07, R08)
compatible = 7.3.3.0.0
db_file_multiblock_read_count = 32
db_block_buffers = 25000
shared_pool_size = 60000000
log_checkpoint_interval = 10000
processes = 500 # INITIAL dml_locks = 100 # INITIAL log_buffer = 1048576 # INITIAL sequence_cache_entries = 10 # INITIAL sequence_cache_hash_buckets = 10 # INITIAL max_dump_file_size = 10240 # limit trace file size to 5 Meg each
background_dump_dest=E:\oradba\admin\prod\bdump user_dump_dest=E:\oradba\admin\prod\udump
db_block_size = 4096
snapshot_refresh_processes = 2
remote_login_passwordfile = shared
text_enable = true
always_anti_join = hash
checkpoint_process = true
db_block_lru_latches = 2
hash_multiblock_io_count = 32
log_archive_buffer_size = 127 log_archive_buffers = 5 log_small_entry_max_size = 80
sort_direct_writes = true sort_write_buffer_size = 32768 sort_write_buffers = 8 sort_area_size = 2097152 sort_area_retained_size = 262144 sort_read_fac = 32 log_archive_dest=F:\OracleArchive
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