Raise the Oracle (OCI) bulkRead default to 200000 (tam#35892)

Benchmarked against the test database on a 231,868 row x 35 column table, the
customer-reported scale, taking the median of three alternating runs:

  ODBC (FBS=10MB, what the app sends)  23.40 s
  OCI  bulkRead=10000                   6.81 s   3.4x
  OCI  bulkRead=200000                  4.64 s   5.0x

The larger value costs memory - peak usage roughly doubled on a 30 column x
100,000 row fetch, 1.2 GB against 2.6 GB - but preview sized queries are
unaffected: at 50 and 1,000 rows the two settings are within measurement noise of
each other and about 45 MB apart, because ROracle allocates against the data
actually fetched rather than reserving bulkRead rows up front. Speed was chosen
over the smaller footprint; the value stays editable per connection for anyone
importing very wide tables.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: hidekoji

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: exploratory
 Type: Package
 Title: R package for Exploratory
-Version: 16.0.20
+Version: 16.0.21
 Date: 2026-07-28
 Authors@R: c(person("Hideaki", "Hayashi", email = "hideaki@exploratory.io", role = c("aut", "cre")), person("Hide", "Kojima", email = "hide@exploratory.io", role = c("aut")), person("Kan", "Nishida", email = "kan@exploratory.io", role = c("aut")), person("Kei", "Saito", email = "kei@exploratory.io", role = c("aut")), person("Yosuke", "Yasuda", email = "double.y.919.quick@gmail.com", role = c("aut")))
 URL: https://github.com/exploratory-io/exploratory_func

R/system.R

@@ -1086,7 +1086,7 @@ stripTrailingSemicolon <- function(query) {
 getDBConnection <- function(type, host = NULL, port = "", databaseName = "", username = "", password = "", catalog = "", schema = "", dsn="", additionalParams = "",
                             collection = "", isSSL = FALSE, authSource = NULL, cluster = NULL, timeout = NULL, connectionString = NULL, driver = NULL, timezone = "",
                             subType = NULL, sslClientCertKey = "", sslCA = "", sslMode = "", role = "", authMethod = "", secretKeyFile = "", secretKeyFilePassword = "",
-                            bulkRead = 10000) {
+                            bulkRead = 200000) {
 
   drv = NULL
   conn = NULL
@@ -2013,7 +2013,7 @@ getDBConnection <- function(type, host = NULL, port = "", databaseName = "", use
       }
       bulkReadRows <- suppressWarnings(as.integer(bulkRead))
       if (is.na(bulkReadRows) || bulkReadRows <= 0) {
-        bulkReadRows <- 10000L
+        bulkReadRows <- 200000L
       }
       # Force the NLS_LANG character set to AL32UTF8 for the duration of the connect, then put
       # the user's own value back. OCI fixes the client character set when it creates its
@@ -2049,7 +2049,7 @@ getDBConnection <- function(type, host = NULL, port = "", databaseName = "", use
 clearDBConnection <- function(type, host = NULL, port = NULL, databaseName, username, catalog = "", schema = "", dsn="", additionalParams = "",
                               collection = "", isSSL = FALSE, authSource = NULL, cluster = NULL, connectionString = NULL, timezone = "",
                               sslClientCertKey = "", sslCA = "", subType = NULL, driver = "", sslMode = '', role = '',
-                              bulkRead = 10000) {
+                              bulkRead = 200000) {
   key <- ""
   if (type %in% c("mongodb")) {
     if(!is.na(connectionString) && connectionString != '') {
@@ -2309,7 +2309,7 @@ queryMySQL <- function(host, port, databaseName, username, password, numOfRows =
 #' @param connectionString (optional) TNS alias, full connect descriptor, or EZConnect string.
 #'   When provided it is used as is and host, port and databaseName are ignored.
 queryOracleOCI <- function(host = "", port = 1521, databaseName = "", username = "", password = "",
-                           numOfRows = -1, query, timezone = "", bulkRead = 10000, connectionString = "", ...) {
+                           numOfRows = -1, query, timezone = "", bulkRead = 200000, connectionString = "", ...) {
   if (!requireNamespace("ROracle")) { stop("package ROracle must be installed.") }
   if (!requireNamespace("DBI")) { stop("package DBI must be installed.") }