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sphinx.conf.in
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sphinx.conf.in
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#
# Sphinx configuration file sample
#
# WARNING! While this sample file mentions all available options,
# it contains (very) short helper descriptions only. Please refer to
# doc/sphinx.html for details.
#
#############################################################################
## data source definition
#############################################################################
source src1
{
# data source type. mandatory, no default value
# known types are mysql, pgsql, mssql, xmlpipe, xmlpipe2, odbc
type = mysql
#####################################################################
## SQL settings (for 'mysql' and 'pgsql' types)
#####################################################################
# some straightforward parameters for SQL source types
sql_host = localhost
sql_user = test
sql_pass =
sql_db = test
sql_port = 3306 # optional, default is 3306
# UNIX socket name
# optional, default is empty (reuse client library defaults)
# usually '/var/lib/mysql/mysql.sock' on Linux
# usually '/tmp/mysql.sock' on FreeBSD
#
# sql_sock = /tmp/mysql.sock
# MySQL specific client connection flags
# optional, default is 0
#
# mysql_connect_flags = 32 # enable compression
# MySQL specific SSL certificate settings
# optional, defaults are empty
#
# mysql_ssl_cert = /etc/ssl/client-cert.pem
# mysql_ssl_key = /etc/ssl/client-key.pem
# mysql_ssl_ca = /etc/ssl/cacert.pem
# MS SQL specific Windows authentication mode flag
# MUST be in sync with charset_type index-level setting
# optional, default is 0
#
# mssql_winauth = 1 # use currently logged on user credentials
# ODBC specific DSN (data source name)
# mandatory for odbc source type, no default value
#
# odbc_dsn = DBQ=C:\data;DefaultDir=C:\data;Driver={Microsoft Text Driver (*.txt; *.csv)};
# sql_query = SELECT id, data FROM documents.csv
# ODBC and MS SQL specific, per-column buffer sizes
# optional, default is auto-detect
#
# sql_column_buffers = content=12M, comments=1M
# pre-query, executed before the main fetch query
# multi-value, optional, default is empty list of queries
#
# sql_query_pre = SET NAMES utf8
# sql_query_pre = SET SESSION query_cache_type=OFF
# main document fetch query
# mandatory, integer document ID field MUST be the first selected column
sql_query = \
SELECT id, group_id, UNIX_TIMESTAMP(date_added) AS date_added, title, content \
FROM documents
# joined/payload field fetch query
# joined fields let you avoid (slow) JOIN and GROUP_CONCAT
# payload fields let you attach custom per-keyword values (eg. for ranking)
#
# syntax is FIELD-NAME 'from' ( 'query' | 'payload-query' ); QUERY
# joined field QUERY should return 2 columns (docid, text)
# payload field QUERY should return 3 columns (docid, keyword, weight)
#
# REQUIRES that query results are in ascending document ID order!
# multi-value, optional, default is empty list of queries
#
# sql_joined_field = tags from query; SELECT docid, CONCAT('tag',tagid) FROM tags ORDER BY docid ASC
# sql_joined_field = wtags from payload-query; SELECT docid, tag, tagweight FROM tags ORDER BY docid ASC
# file based field declaration
#
# content of this field is treated as a file name
# and the file gets loaded and indexed in place of a field
#
# max file size is limited by max_file_field_buffer indexer setting
# file IO errors are non-fatal and get reported as warnings
#
# sql_file_field = content_file_path
# range query setup, query that must return min and max ID values
# optional, default is empty
#
# sql_query will need to reference $start and $end boundaries
# if using ranged query:
#
# sql_query = \
# SELECT doc.id, doc.id AS group, doc.title, doc.data \
# FROM documents doc \
# WHERE id>=$start AND id<=$end
#
# sql_query_range = SELECT MIN(id),MAX(id) FROM documents
# range query step
# optional, default is 1024
#
# sql_range_step = 1000
# unsigned integer attribute declaration
# multi-value (an arbitrary number of attributes is allowed), optional
# optional bit size can be specified, default is 32
#
# sql_attr_uint = author_id
# sql_attr_uint = forum_id:9 # 9 bits for forum_id
sql_attr_uint = group_id
# boolean attribute declaration
# multi-value (an arbitrary number of attributes is allowed), optional
# equivalent to sql_attr_uint with 1-bit size
#
# sql_attr_bool = is_deleted
# bigint attribute declaration
# multi-value (an arbitrary number of attributes is allowed), optional
# declares a signed (unlike uint!) 64-bit attribute
#
# sql_attr_bigint = my_bigint_id
# UNIX timestamp attribute declaration
# multi-value (an arbitrary number of attributes is allowed), optional
# similar to integer, but can also be used in date functions
#
# sql_attr_timestamp = posted_ts
# sql_attr_timestamp = last_edited_ts
sql_attr_timestamp = date_added
# floating point attribute declaration
# multi-value (an arbitrary number of attributes is allowed), optional
# values are stored in single precision, 32-bit IEEE 754 format
#
# sql_attr_float = lat_radians
# sql_attr_float = long_radians
# multi-valued attribute (MVA) attribute declaration
# multi-value (an arbitrary number of attributes is allowed), optional
# MVA values are variable length lists of unsigned 32-bit integers
#
# syntax is ATTR-TYPE ATTR-NAME 'from' SOURCE-TYPE [;QUERY] [;RANGE-QUERY]
# ATTR-TYPE is 'uint' or 'timestamp'
# SOURCE-TYPE is 'field', 'query', or 'ranged-query'
# QUERY is SQL query used to fetch all ( docid, attrvalue ) pairs
# RANGE-QUERY is SQL query used to fetch min and max ID values, similar to 'sql_query_range'
#
# sql_attr_multi = uint tag from query; SELECT docid, tagid FROM tags
# sql_attr_multi = uint tag from ranged-query; \
# SELECT docid, tagid FROM tags WHERE id>=$start AND id<=$end; \
# SELECT MIN(docid), MAX(docid) FROM tags
# string attribute declaration
# multi-value (an arbitrary number of these is allowed), optional
# lets you store and retrieve strings
#
# sql_attr_string = stitle
# JSON attribute declaration
# multi-value (an arbitrary number of these is allowed), optional
# lets you store a JSON document as an (in-memory) attribute for later use
#
# sql_attr_json = properties
# combined field plus attribute declaration (from a single column)
# stores column as an attribute, but also indexes it as a full-text field
#
# sql_field_string = author
# post-query, executed on sql_query completion
# optional, default is empty
#
# sql_query_post =
# post-index-query, executed on successful indexing completion
# optional, default is empty
# $maxid expands to max document ID actually fetched from DB
#
# sql_query_post_index = REPLACE INTO counters ( id, val ) \
# VALUES ( 'max_indexed_id', $maxid )
# ranged query throttling, in milliseconds
# optional, default is 0 which means no delay
# enforces given delay before each query step
sql_ranged_throttle = 0
# kill-list query, fetches the document IDs for kill-list
# k-list will suppress matches from preceding indexes in the same query
# optional, default is empty
#
# sql_query_killlist = SELECT id FROM documents WHERE edited>=@last_reindex
# columns to unpack on indexer side when indexing
# multi-value, optional, default is empty list
#
# unpack_zlib = zlib_column
# unpack_mysqlcompress = compressed_column
# unpack_mysqlcompress = compressed_column_2
# maximum unpacked length allowed in MySQL COMPRESS() unpacker
# optional, default is 16M
#
# unpack_mysqlcompress_maxsize = 16M
# hook command to run when SQL connection succeeds
# optional, default value is empty (do nothing)
#
# hook_connect = bash sql_connect.sh
# hook command to run after (any) SQL range query
# it may print out "minid maxid" (w/o quotes) to override the range
# optional, default value is empty (do nothing)
#
# hook_query_range = bash sql_query_range.sh
# hook command to run on successful indexing completion
# $maxid expands to max document ID actually fetched from DB
# optional, default value is empty (do nothing)
#
# hook_post_index = bash sql_post_index.sh $maxid
#####################################################################
## xmlpipe2 settings
#####################################################################
# type = xmlpipe
# shell command to invoke xmlpipe stream producer
# mandatory
#
# xmlpipe_command = cat @CONFDIR@/test.xml
# xmlpipe2 field declaration
# multi-value, optional, default is empty
#
# xmlpipe_field = subject
# xmlpipe_field = content
# xmlpipe2 attribute declaration
# multi-value, optional, default is empty
# all xmlpipe_attr_XXX options are fully similar to sql_attr_XXX
# examples:
#
# xmlpipe_attr_timestamp = published
# xmlpipe_attr_uint = author_id
# xmlpipe_attr_bool = is_enabled
# xmlpipe_attr_float = latitude
# xmlpipe_attr_bigint = guid
# xmlpipe_attr_multi = tags
# xmlpipe_attr_multi_64 = tags64
# xmlpipe_attr_string = title
# xmlpipe_attr_json = extra_data
# xmlpipe_field_string = content
# perform UTF-8 validation, and filter out incorrect codes
# avoids XML parser choking on non-UTF-8 documents
# optional, default is 0
#
# xmlpipe_fixup_utf8 = 1
}
# inherited source example
#
# all the parameters are copied from the parent source,
# and may then be overridden in this source definition
source src1throttled : src1
{
sql_ranged_throttle = 100
}
#############################################################################
## index definition
#############################################################################
# local index example
#
# this is an index which is stored locally in the filesystem
#
# all indexing-time options (such as morphology and charsets)
# are configured per local index
index test1
{
# index type
# optional, default is 'plain'
# known values are 'plain', 'distributed', and 'rt' (see samples below)
# type = plain
# document source(s) to index
# multi-value, mandatory
# document IDs must be globally unique across all sources
source = src1
# index files path and file name, without extension
# mandatory, path must be writable, extensions will be auto-appended
path = @CONFDIR@/data/test1
# document attribute values (docinfo) storage mode
# optional, default is 'extern'
# known values are 'none', 'extern' and 'inline'
docinfo = extern
# dictionary type, 'crc' or 'keywords'
# crc is faster to index when no substring/wildcards searches are needed
# crc with substrings might be faster to search but is much slower to index
# (because all substrings are pre-extracted as individual keywords)
# keywords is much faster to index with substrings, and index is much (3-10x) smaller
# keywords supports wildcards, crc does not, and never will
# optional, default is 'keywords'
dict = keywords
# memory locking for cached data (.spa and .spi), to prevent swapping
# optional, default is 0 (do not mlock)
# requires searchd to be run from root
mlock = 0
# a list of morphology preprocessors to apply
# optional, default is empty
#
# builtin preprocessors are 'none', 'stem_en', 'stem_ru', 'stem_enru',
# 'soundex', and 'metaphone'; additional preprocessors available from
# libstemmer are 'libstemmer_XXX', where XXX is algorithm code
# (see libstemmer_c/libstemmer/modules.txt)
#
# morphology = stem_en, stem_ru, soundex
# morphology = libstemmer_german
# morphology = libstemmer_sv
morphology = none
# minimum word length at which to enable stemming
# optional, default is 1 (stem everything)
#
# min_stemming_len = 1
# stopword files list (space separated)
# optional, default is empty
# contents are plain text, charset_table and stemming are both applied
#
# stopwords = @CONFDIR@/data/stopwords.txt
# wordforms file, in "mapfrom > mapto" plain text format
# optional, default is empty
#
# wordforms = @CONFDIR@/data/wordforms.txt
# tokenizing exceptions file
# optional, default is empty
#
# plain text, case sensitive, space insensitive in map-from part
# one "Map Several Words => ToASingleOne" entry per line
#
# exceptions = @CONFDIR@/data/exceptions.txt
# embedded file size limit
# optional, default is 16K
#
# exceptions, wordforms, and stopwords files smaller than this limit
# are stored in the index; otherwise, their paths and sizes are stored
#
# embedded_limit = 16K
# minimum indexed word length
# default is 1 (index everything)
min_word_len = 1
# ignored characters list
# optional, default value is empty
#
# ignore_chars = U+00AD
# minimum word prefix length to index
# optional, default is 0 (do not index prefixes)
#
# min_prefix_len = 0
# minimum word infix length to index
# optional, default is 0 (do not index infixes)
#
# min_infix_len = 0
# maximum substring (prefix or infix) length to index
# optional, default is 0 (do not limit substring length)
#
# max_substring_len = 8
# list of fields to limit prefix/infix indexing to
# optional, default value is empty (index all fields in prefix/infix mode)
#
# prefix_fields = filename
# infix_fields = url, domain
# expand keywords with exact forms and/or stars when searching fit indexes
# search-time only, does not affect indexing, can be 0 or 1
# optional, default is 0 (do not expand keywords)
#
# expand_keywords = 1
# n-gram length to index, for CJK indexing
# only supports 0 and 1 for now, other lengths to be implemented
# optional, default is 0 (disable n-grams)
#
# ngram_len = 1
# n-gram characters list, for CJK indexing
# optional, default is empty
#
# ngram_chars = U+3000..U+2FA1F
# phrase boundary characters list
# optional, default is empty
#
# phrase_boundary = ., ?, !, U+2026 # horizontal ellipsis
# phrase boundary word position increment
# optional, default is 0
#
# phrase_boundary_step = 100
# blended characters list
# blended chars are indexed both as separators and valid characters
# for instance, AT&T will results in 3 tokens ("at", "t", and "at&t")
# optional, default is empty
#
# blend_chars = +, &, U+23
# blended token indexing mode
# a comma separated list of blended token indexing variants
# known variants are trim_none, trim_head, trim_tail, trim_both, skip_pure
# optional, default is trim_none
#
# blend_mode = trim_tail, skip_pure
# whether to strip HTML tags from incoming documents
# known values are 0 (do not strip) and 1 (do strip)
# optional, default is 0
html_strip = 0
# what HTML attributes to index if stripping HTML
# optional, default is empty (do not index anything)
#
# html_index_attrs = img=alt,title; a=title;
# what HTML elements contents to strip
# optional, default is empty (do not strip element contents)
#
# html_remove_elements = style, script
# whether to preopen index data files on startup
# optional, default is 0 (do not preopen), searchd-only
#
# preopen = 1
# whether to enable in-place inversion (2x less disk, 90-95% speed)
# optional, default is 0 (use separate temporary files), indexer-only
#
# inplace_enable = 1
# in-place fine-tuning options
# optional, defaults are listed below
#
# inplace_hit_gap = 0 # preallocated hitlist gap size
# inplace_docinfo_gap = 0 # preallocated docinfo gap size
# inplace_reloc_factor = 0.1 # relocation buffer size within arena
# inplace_write_factor = 0.1 # write buffer size within arena
# whether to index original keywords along with stemmed versions
# enables "=exactform" operator to work
# optional, default is 0
#
# index_exact_words = 1
# position increment on overshort (less that min_word_len) words
# optional, allowed values are 0 and 1, default is 1
#
# overshort_step = 1
# position increment on stopword
# optional, allowed values are 0 and 1, default is 1
#
# stopword_step = 1
# hitless words list
# positions for these keywords will not be stored in the index
# optional, allowed values are 'all', or a list file name
#
# hitless_words = all
# hitless_words = hitless.txt
# detect and index sentence and paragraph boundaries
# required for the SENTENCE and PARAGRAPH operators to work
# optional, allowed values are 0 and 1, default is 0
#
# index_sp = 1
# index zones, delimited by HTML/XML tags
# a comma separated list of tags and wildcards
# required for the ZONE operator to work
# optional, default is empty string (do not index zones)
#
# index_zones = title, h*, th
# index per-document and average per-index field lengths, in tokens
# required for the BM25A(), BM25F() in expression ranker
# optional, default is 0 (do not index field lenghts)
#
# index_field_lengths = 1
# regular expressions (regexps) to filter the fields and queries with
# gets applied to data source fields when indexing
# gets applied to search queries when searching
# multi-value, optional, default is empty list of regexps
#
# regexp_filter = \b(\d+)\" => \1inch
# regexp_filter = (blue|red) => color
# list of the words considered frequent with respect to bigram indexing
# optional, default is empty
#
# bigram_freq_words = the, a, i, you, my
# bigram indexing mode
# known values are none, all, first_freq, both_freq
# option, default is none (do not index bigrams)
#
# bigram_index = both_freq
# snippet document file name prefix
# preprended to file names when generating snippets using load_files option
# WARNING, this is a prefix (not a path), trailing slash matters!
# optional, default is empty
#
# snippets_file_prefix = /mnt/mydocs/server1
# whether to apply stopwords before or after stemming
# optional, default is 0 (apply stopwords after stemming)
#
# stopwords_unstemmed = 0
# path to a global (cluster-wide) keyword IDFs file
# optional, default is empty (use local IDFs)
#
# global_idf = /usr/local/sphinx/var/global.idf
}
# inherited index example
#
# all the parameters are copied from the parent index,
# and may then be overridden in this index definition
index test1stemmed : test1
{
path = @CONFDIR@/data/test1stemmed
morphology = stem_en
}
# distributed index example
#
# this is a virtual index which can NOT be directly indexed,
# and only contains references to other local and/or remote indexes
index dist1
{
# 'distributed' index type MUST be specified
type = distributed
# local index to be searched
# there can be many local indexes configured
local = test1
local = test1stemmed
# remote agent
# multiple remote agents may be specified
# syntax for TCP connections is 'hostname:port:index1,[index2[,...]]'
# syntax for local UNIX connections is '/path/to/socket:index1,[index2[,...]]'
agent = localhost:9313:remote1
agent = localhost:9314:remote2,remote3
# agent = /var/run/searchd.sock:remote4
# remote agent mirrors groups, aka mirrors, aka HA agents
# defines 2 or more interchangeable mirrors for a given index part
#
# agent = server3:9312 | server4:9312 :indexchunk2
# agent = server3:9312:chunk2server3 | server4:9312:chunk2server4
# agent = server3:chunk2server3 | server4:chunk2server4
# agent = server21|server22|server23:chunk2
# blackhole remote agent, for debugging/testing
# network errors and search results will be ignored
#
# agent_blackhole = testbox:9312:testindex1,testindex2
# persistenly connected remote agent
# reduces connect() pressure, requires that workers IS threads
#
# agent_persistent = testbox:9312:testindex1,testindex2
# remote agent connection timeout, milliseconds
# optional, default is 1000 ms, ie. 1 sec
agent_connect_timeout = 1000
# remote agent query timeout, milliseconds
# optional, default is 3000 ms, ie. 3 sec
agent_query_timeout = 3000
# HA mirror agent strategy
# optional, defaults to ??? (random mirror)
# know values are nodeads, noerrors, roundrobin, nodeadstm, noerrorstm
#
# ha_strategy = nodeads
# path to RLP context file
# optional, defaut is empty
#
# rlp_context = /usr/local/share/sphinx/rlp/rlp-context.xml
}
# realtime index example
#
# you can run INSERT, REPLACE, and DELETE on this index on the fly
# using MySQL protocol (see 'listen' directive below)
index rt
{
# 'rt' index type must be specified to use RT index
type = rt
# index files path and file name, without extension
# mandatory, path must be writable, extensions will be auto-appended
path = @CONFDIR@/data/rt
# RAM chunk size limit
# RT index will keep at most this much data in RAM, then flush to disk
# optional, default is 128M
#
# rt_mem_limit = 512M
# full-text field declaration
# multi-value, mandatory
rt_field = title
rt_field = content
# unsigned integer attribute declaration
# multi-value (an arbitrary number of attributes is allowed), optional
# declares an unsigned 32-bit attribute
rt_attr_uint = gid
# RT indexes currently support the following attribute types:
# uint, bigint, float, timestamp, string, mva, mva64, json
#
# rt_attr_bigint = guid
# rt_attr_float = gpa
# rt_attr_timestamp = ts_added
# rt_attr_string = author
# rt_attr_multi = tags
# rt_attr_multi_64 = tags64
# rt_attr_json = extra_data
}
#############################################################################
## indexer settings
#############################################################################
indexer
{
# memory limit, in bytes, kiloytes (16384K) or megabytes (256M)
# optional, default is 128M, max is 2047M, recommended is 256M to 1024M
mem_limit = 128M
# maximum IO calls per second (for I/O throttling)
# optional, default is 0 (unlimited)
#
# max_iops = 40
# maximum IO call size, bytes (for I/O throttling)
# optional, default is 0 (unlimited)
#
# max_iosize = 1048576
# maximum xmlpipe2 field length, bytes
# optional, default is 2M
#
# max_xmlpipe2_field = 4M
# write buffer size, bytes
# several (currently up to 4) buffers will be allocated
# write buffers are allocated in addition to mem_limit
# optional, default is 1M
#
# write_buffer = 1M
# maximum file field adaptive buffer size
# optional, default is 8M, minimum is 1M
#
# max_file_field_buffer = 32M
# how to handle IO errors in file fields
# known values are 'ignore_field', 'skip_document', and 'fail_index'
# optional, default is 'ignore_field'
#
# on_file_field_error = skip_document
# lemmatizer cache size
# improves the indexing time when the lemmatization is enabled
# optional, default is 256K
#
# lemmatizer_cache = 512M
}
#############################################################################
## searchd settings
#############################################################################
searchd
{
# [hostname:]port[:protocol], or /unix/socket/path to listen on
# known protocols are 'sphinx' (SphinxAPI) and 'mysql41' (SphinxQL)
#
# multi-value, multiple listen points are allowed
# optional, defaults are 9312:sphinx and 9306:mysql41, as below
#
# listen = 127.0.0.1
# listen = 192.168.0.1:9312
# listen = 9312
# listen = /var/run/searchd.sock
listen = 9312
listen = 9306:mysql41
# log file, searchd run info is logged here
# optional, default is 'searchd.log'
log = @CONFDIR@/log/searchd.log
# query log file, all search queries are logged here
# optional, default is empty (do not log queries)
query_log = @CONFDIR@/log/query.log
# client read timeout, seconds
# optional, default is 5
read_timeout = 5
# request timeout, seconds
# optional, default is 5 minutes
client_timeout = 300
# maximum amount of children to fork (concurrent searches to run)
# optional, default is 0 (unlimited)
max_children = 30
# maximum amount of persistent connections from this master to each agent host
# optional, but necessary if you use agent_persistent. It is reasonable to set the value
# as max_children, or less on the agent's hosts.
persistent_connections_limit = 30
# PID file, searchd process ID file name
# mandatory
pid_file = @CONFDIR@/log/searchd.pid
# seamless rotate, prevents rotate stalls if precaching huge datasets
# optional, default is 1
seamless_rotate = 1
# whether to forcibly preopen all indexes on startup
# optional, default is 1 (preopen everything)
preopen_indexes = 1
# whether to unlink .old index copies on succesful rotation.
# optional, default is 1 (do unlink)
unlink_old = 1
# attribute updates periodic flush timeout, seconds
# updates will be automatically dumped to disk this frequently
# optional, default is 0 (disable periodic flush)
#
# attr_flush_period = 900
# MVA updates pool size
# shared between all instances of searchd, disables attr flushes!
# optional, default size is 1M
mva_updates_pool = 1M
# max allowed network packet size
# limits both query packets from clients, and responses from agents
# optional, default size is 8M
max_packet_size = 8M
# max allowed per-query filter count
# optional, default is 256
max_filters = 256
# max allowed per-filter values count
# optional, default is 4096
max_filter_values = 4096
# socket listen queue length
# optional, default is 5
#
# listen_backlog = 5
# per-keyword read buffer size
# optional, default is 256K
#
# read_buffer = 256K
# unhinted read size (currently used when reading hits)
# optional, default is 32K
#
# read_unhinted = 32K
# max allowed per-batch query count (aka multi-query count)
# optional, default is 32
max_batch_queries = 32
# max common subtree document cache size, per-query
# optional, default is 0 (disable subtree optimization)
#
# subtree_docs_cache = 4M
# max common subtree hit cache size, per-query
# optional, default is 0 (disable subtree optimization)
#
# subtree_hits_cache = 8M
# multi-processing mode (MPM)
# known values are none, fork, prefork, and threads
# threads is required for RT backend to work
# optional, default is threads
workers = threads # for RT to work
# max threads to create for searching local parts of a distributed index
# optional, default is 0, which means disable multi-threaded searching
# should work with all MPMs (ie. does NOT require workers=threads)
#
# dist_threads = 4
# binlog files path; use empty string to disable binlog
# optional, default is build-time configured data directory
#
# binlog_path = # disable logging
# binlog_path = @CONFDIR@/data # binlog.001 etc will be created there
# binlog flush/sync mode
# 0 means flush and sync every second
# 1 means flush and sync every transaction
# 2 means flush every transaction, sync every second
# optional, default is 2
#
# binlog_flush = 2
# binlog per-file size limit
# optional, default is 128M, 0 means no limit
#
# binlog_max_log_size = 256M
# per-thread stack size, only affects workers=threads mode
# optional, default is 64K
#
# thread_stack = 128K
# per-keyword expansion limit (for dict=keywords prefix searches)
# optional, default is 0 (no limit)
#
# expansion_limit = 1000
# RT RAM chunks flush period
# optional, default is 0 (no periodic flush)
#
# rt_flush_period = 900
# query log file format
# optional, known values are plain and sphinxql, default is plain
#
# query_log_format = sphinxql
# version string returned to MySQL network protocol clients
# optional, default is empty (use Sphinx version)
#
# mysql_version_string = 5.0.37
# default server-wide collation
# optional, default is libc_ci
#
# collation_server = utf8_general_ci
# server-wide locale for libc based collations
# optional, default is C
#
# collation_libc_locale = ru_RU.UTF-8
# threaded server watchdog (only used in workers=threads mode)
# optional, values are 0 and 1, default is 1 (watchdog on)
#
# watchdog = 1